diff --git a/c_programs/c_programs/access array elements.cpp b/c_programs/c_programs/access array elements.cpp
new file mode 100644
index 0000000..718d6be
--- /dev/null
+++ b/c_programs/c_programs/access array elements.cpp	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+int main()
+{
+	int a[5],i;
+	for(i=0;i<5;i++)
+	{
+		printf("\n Enter the element=");
+		scanf("%d",&a[i]);
+		
+	}
+	  printf("Array elements are \n");
+	   for(i=0;i<5;i++)
+	{
+		printf("%d\n",a[i]);
+	}
+	
+}
diff --git a/c_programs/c_programs/access array elements.exe b/c_programs/c_programs/access array elements.exe
new file mode 100644
index 0000000..0f68200
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diff --git a/c_programs/c_programs/add to integers.cpp b/c_programs/c_programs/add to integers.cpp
new file mode 100644
index 0000000..467dcd2
--- /dev/null
+++ b/c_programs/c_programs/add to integers.cpp	
@@ -0,0 +1,11 @@
+#include<stdio.h>
+int main()
+{
+	int a,b,sum;
+	printf("Enter two numbers");
+	scanf("%d%d",&a,&b);
+	sum=a+b;
+    printf("sum of two numbers is %d",sum);
+}
+
+
diff --git a/c_programs/c_programs/add to integers.exe b/c_programs/c_programs/add to integers.exe
new file mode 100644
index 0000000..67096af
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diff --git a/c_programs/c_programs/add two numbers using functions.cpp b/c_programs/c_programs/add two numbers using functions.cpp
new file mode 100644
index 0000000..0b89614
--- /dev/null
+++ b/c_programs/c_programs/add two numbers using functions.cpp	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+//program to demonstrate the use of functions in c 
+void add(int x,int y);  //function prototype
+int main()
+{
+ int x,y;	
+	printf("Enter ywo numbers");
+	scanf("%d%d",&x,&y);
+	add(x,y);   //function call
+}
+void add(int a,int b)
+{
+	int c;
+	c=a+b;          //function definition
+	printf("sum is %d",c);
+	return c;
+}
diff --git a/c_programs/c_programs/addition and subtraction of a 2-D matrix.cpp b/c_programs/c_programs/addition and subtraction of a 2-D matrix.cpp
new file mode 100644
index 0000000..ea49d09
--- /dev/null
+++ b/c_programs/c_programs/addition and subtraction of a 2-D matrix.cpp	
@@ -0,0 +1,80 @@
+#include<stdio.h>
+int main()
+{
+	int m,n,a[10][10],b[10][10],c[10][10],d[10][10],i,j;
+	printf("Enter number of rows m = ");
+	scanf("%d",&m);
+	printf("Enter number of columns n ");
+	scanf("%d",&n);
+	printf("Marix elements:");
+	for(i=0;i<m;i++)
+	{
+		for(j=0;j<n;j++)
+		{
+			printf("Enter elements[%d][%d] :",i,j);
+			scanf(" %d ",&a[i][j]);
+		}
+	}
+	printf("Matix1:\n");
+	for(i=0;i<n;i++)
+	{
+		for(j=0;j<n;j++)
+		{
+			printf("\n %d ",a[i][j]);
+		}
+		printf("\n");
+	}
+	printf("Matrix 2:\n");
+	for(i=0;i<m;i++)
+	{
+		for(j=0;j<n;j++)
+		{
+			printf("Enter elements[%d][%d]:",i,j);
+			scanf(" %d ",&b[i][j]);
+		}
+		
+    }
+    for(i=0;i<m;i++)
+    {
+    	for(j=0;j<n;j++)
+    	{
+    		printf(" %d ",b[i][j]);
+		}
+		printf("\n");
+	}
+	
+	/* LOGIC FOR ADDITION */
+	for(i=0;i<m;i++)
+	{
+		for(j=0;j<n;j++)
+		{
+			c[i][j]=a[i][j]+b[i][j];
+		}
+	}
+	for(i=0;i<m;i++)
+	{
+		for(j=0;j<n;j++)
+		{
+			d[i][j]=a[i][j]-b[i][j];
+		}
+	}
+	printf("Addition of matrix is : ");
+	for(i=0;i<m;i++)
+	{
+		for(j=0;j<n;j++)
+		{
+			printf(" %d ",c[i][j]);
+		}
+		printf("\n");
+	}
+	printf("Subtraction of matrix is : ");
+	for(i=0;i<m;i++)
+	{
+		for(j=0;j<n;j++)
+		{
+			printf(" %d ",d[i][j]);
+		}
+		printf("\n");
+	}
+}
+
diff --git a/c_programs/c_programs/addition and subtraction of a 2-D matrix.exe b/c_programs/c_programs/addition and subtraction of a 2-D matrix.exe
new file mode 100644
index 0000000..2e03845
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diff --git a/c_programs/c_programs/addition of two matrices.cpp b/c_programs/c_programs/addition of two matrices.cpp
new file mode 100644
index 0000000..016bf81
--- /dev/null
+++ b/c_programs/c_programs/addition of two matrices.cpp	
@@ -0,0 +1,37 @@
+#include<stdio.h>
+int main()
+{
+	int m1[10][10],m2[10][10],m3[10][10],m,n,i,j,addition;
+	printf("Enter number of rows = ");
+	scanf("%d",&m);
+	printf("Enter number of columns = ");
+	scanf("%d",&n);
+    printf("Enter elements of first matrix= \n");	
+	 for(i=0;i<m;i++)
+     {
+     	for(j=0;j<n;j++)
+     	{
+     	  scanf("%d ",&m1[i][j]);	
+		 }
+	}
+    printf("Enter elements of second matrix = \n");
+    for(i=0;i<m;i++)
+    {
+    	for(j=0;j<n;j++)
+    	{
+    		scanf("%d",&m2[i][j]);
+		}
+	}
+	printf("Addition of matrices is = ");
+	for(i=0;i<m;i++)
+	{
+		for(j=0;j<n;j++)
+		{
+			m3[i][j]=m1[i][j]+m2[i][j];
+			printf("%d\t",m3[i][j]);
+		}
+		printf("\n");
+	}
+	printf("ADDITION OF MATRICES IS ",addition);
+	 }
+
diff --git a/c_programs/c_programs/addition of two matrices.exe b/c_programs/c_programs/addition of two matrices.exe
new file mode 100644
index 0000000..41b0b43
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diff --git a/c_programs/c_programs/age of a person in weeks,days,years,hours.exe b/c_programs/c_programs/age of a person in weeks,days,years,hours.exe
new file mode 100644
index 0000000..1cb40e6
Binary files /dev/null and b/c_programs/c_programs/age of a person in weeks,days,years,hours.exe differ
diff --git a/c_programs/c_programs/age of person in years,week,days,hours.cpp b/c_programs/c_programs/age of person in years,week,days,hours.cpp
new file mode 100644
index 0000000..fcebf33
--- /dev/null
+++ b/c_programs/c_programs/age of person in years,week,days,hours.cpp	
@@ -0,0 +1,18 @@
+#include<stdio.h>
+int main()
+{
+	/* CALCULATE AGE OF A PERSON */ 
+	int cy,by,week,age,hrs;
+	printf("Enter the birth year = ");
+	scanf("%d",&by);
+	printf("Enter the current year = ");
+	scanf("%d",&cy);
+	age=cy-by;
+	printf("Age of person is %d",age);
+	week=(age*365)/7;
+	printf("\n Age in week is = %d \n",week);
+	hrs=week*7*24;
+	printf(" \nAge in hours is = %d \n",hrs);
+	
+	
+}
diff --git a/c_programs/c_programs/all prime numbers between 1 to n.cpp b/c_programs/c_programs/all prime numbers between 1 to n.cpp
new file mode 100644
index 0000000..b13b39a
--- /dev/null
+++ b/c_programs/c_programs/all prime numbers between 1 to n.cpp	
@@ -0,0 +1,21 @@
+#include<stdio.h>
+int main()
+{
+	int num,i,dividend,n;
+	printf("enter maximum range");
+	scanf("%d",&n);
+	for(num=1;num<=n;num++)
+	{
+		dividend=0;
+		for(i=2;i>=num/2;i++)
+		{
+			if(num%i==0)
+			{
+			  dividend++;
+				break;
+			}
+		}
+		if (dividend==0 && num!=1)
+		  printf("%d\t",num);
+	}
+}
diff --git a/c_programs/c_programs/all prime numbers between 1 to n.exe b/c_programs/c_programs/all prime numbers between 1 to n.exe
new file mode 100644
index 0000000..452d29f
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diff --git a/c_programs/c_programs/alphabet pattern 1.cpp b/c_programs/c_programs/alphabet pattern 1.cpp
new file mode 100644
index 0000000..451dbc0
--- /dev/null
+++ b/c_programs/c_programs/alphabet pattern 1.cpp	
@@ -0,0 +1,16 @@
+#include<stdio.h>
+int main()
+{
+	int i,j;
+	char ch='A';
+	 for(i=1;i<=5;i++)
+	 {
+	 	for(j=1;j<=i;j++)
+	 	{
+	 		printf("\n%c",ch);
+	 		ch++;
+		 }
+		 ch='A';
+
+	  printf("\n");
+}
diff --git a/c_programs/c_programs/alphabet pattern 1.exe b/c_programs/c_programs/alphabet pattern 1.exe
new file mode 100644
index 0000000..6583255
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diff --git a/c_programs/c_programs/alphabet pattern 2.cpp b/c_programs/c_programs/alphabet pattern 2.cpp
new file mode 100644
index 0000000..0eedea4
--- /dev/null
+++ b/c_programs/c_programs/alphabet pattern 2.cpp	
@@ -0,0 +1,16 @@
+#include<stdio.h>
+int main()
+{
+	int i,j;
+	char ch='A';
+	for(i=1;i<=5;i++)
+	{
+		for(j=1;j<=i;j++)
+		{
+		
+		printf("%c",ch);
+	}
+	   ch++;
+	  printf("\n");
+}
+}
diff --git a/c_programs/c_programs/alphabet pattern 2.exe b/c_programs/c_programs/alphabet pattern 2.exe
new file mode 100644
index 0000000..d9bd79a
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diff --git a/c_programs/c_programs/alphabet pattern 3.cpp b/c_programs/c_programs/alphabet pattern 3.cpp
new file mode 100644
index 0000000..3c64836
--- /dev/null
+++ b/c_programs/c_programs/alphabet pattern 3.cpp	
@@ -0,0 +1,15 @@
+#include<stdio.h>
+int main()
+{
+	int i,j;
+	char ch='A';
+	for(i=1;i<=5;i++)
+	{
+		for(j=1;j<=i;j++)
+		{
+			printf("%c",ch);
+			ch++;
+		}
+		printf("\n");
+	}
+}
diff --git a/c_programs/c_programs/alphabet pattern 3.exe b/c_programs/c_programs/alphabet pattern 3.exe
new file mode 100644
index 0000000..647e2d7
Binary files /dev/null and b/c_programs/c_programs/alphabet pattern 3.exe differ
diff --git a/c_programs/c_programs/alphabet pattern in v shape.cpp b/c_programs/c_programs/alphabet pattern in v shape.cpp
new file mode 100644
index 0000000..0d78c3c
--- /dev/null
+++ b/c_programs/c_programs/alphabet pattern in v shape.cpp	
@@ -0,0 +1,22 @@
+#include<stdio.h>
+int main()
+{
+	int i,j;
+	for(i=1;i<=5;i++)
+	{
+		for(j=1;j<=9;j++)
+		{
+			if(j<=i || j>=10-i)
+			{
+				printf("%c",96+i);
+			}
+			else
+			{
+				printf(" ");
+			}
+			
+		}
+		printf("\n");
+	}
+	
+}
diff --git a/c_programs/c_programs/alphabet pattern.cpp b/c_programs/c_programs/alphabet pattern.cpp
new file mode 100644
index 0000000..34ef94f
--- /dev/null
+++ b/c_programs/c_programs/alphabet pattern.cpp	
@@ -0,0 +1,23 @@
+#include<stdio.h>
+int main()
+{
+	int i,j;
+	char k;
+	for(i=1;i<=3;i++)
+	{
+	  k='A';
+	 for(j=1;j<=3;j++)
+	 {
+	 
+		if(j<=i)
+		printf("%c",k);
+		k++;
+	}
+		else
+		 printf(" ");
+		
+		
+	}
+	printf("\n");
+}
+}
diff --git a/c_programs/c_programs/alphabets pattern in inverted U shap.cpp b/c_programs/c_programs/alphabets pattern in inverted U shap.cpp
new file mode 100644
index 0000000..d61e86f
--- /dev/null
+++ b/c_programs/c_programs/alphabets pattern in inverted U shap.cpp	
@@ -0,0 +1,25 @@
+#include<stdio.h>
+int main()
+{
+	int i,j;
+	char ch;
+	for(i=1;i<=4;i++)
+	{
+		  ch='A';
+		for(j=1;j<=7;j++)
+		{
+			if(j<=5-i||j>=3+i)
+			{
+			  printf("%c",ch);
+			  j<4?ch++:ch--;
+		    }
+		     else
+		     {
+		     	printf(" ");
+		          if(j==4)
+		     	ch--;
+			 }
+	    }
+	    printf("\n");
+}
+}
diff --git a/c_programs/c_programs/alphabets pattern in inverted U shap.exe b/c_programs/c_programs/alphabets pattern in inverted U shap.exe
new file mode 100644
index 0000000..1b941c8
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diff --git a/c_programs/c_programs/area of rectangle using functions.cpp b/c_programs/c_programs/area of rectangle using functions.cpp
new file mode 100644
index 0000000..bcd2ff6
--- /dev/null
+++ b/c_programs/c_programs/area of rectangle using functions.cpp	
@@ -0,0 +1,20 @@
+#include<stdio.h>
+int area(int l,int b);
+int main()
+{
+	int l,b;
+	printf("Enter the length\n");
+	scanf("%d",&l);
+	printf("Enter the breadth\n");
+	scanf("%d",&b);
+	rectangle=area(l,b);
+	printf("Area of rectangle = %d",rectangle);
+	
+}
+ int area(int l,int b)
+{
+	int area;
+	area=l*b;
+	return(area);
+}
+
diff --git a/c_programs/c_programs/area of square using functions.cpp b/c_programs/c_programs/area of square using functions.cpp
new file mode 100644
index 0000000..13fe1bd
--- /dev/null
+++ b/c_programs/c_programs/area of square using functions.cpp	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+ square area ();
+ int main()
+{
+  int a,square;	
+	printf("Enter side of square=");
+	scanf("%d",&a);
+	square=area(a*a);
+	print("\nArea of square =%d",square);
+}
+  area()
+{
+	int a;
+	area=a*a;
+	return();
+}
+
diff --git a/c_programs/c_programs/armstrong number using functions.cpp b/c_programs/c_programs/armstrong number using functions.cpp
new file mode 100644
index 0000000..3efc0fc
--- /dev/null
+++ b/c_programs/c_programs/armstrong number using functions.cpp	
@@ -0,0 +1,30 @@
+#include<stdio.h>
+void armstrong ()
+
+{
+	int num,sum=0,r,original_number;
+	printf("Enter a number");
+	scanf("%d",&num);
+	original_number=num;
+	while(num!=0)
+	{
+		r=num%10;
+		sum=sum+r*r*r;
+		num=num/10;
+	}
+	printf("new number is %d",num);
+	if(sum=num)
+	  {
+	  	printf("number is armstrong\n");
+	  }
+	else
+	{
+	  printf("number is not armstrong\n");	
+	}
+void armstrong();
+void main()
+{
+  
+  armstrong();       //function call
+}
+
diff --git a/c_programs/c_programs/armstrong number using functions.exe b/c_programs/c_programs/armstrong number using functions.exe
new file mode 100644
index 0000000..4968418
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diff --git a/c_programs/c_programs/armstrong number.cpp b/c_programs/c_programs/armstrong number.cpp
new file mode 100644
index 0000000..dc9bac6
--- /dev/null
+++ b/c_programs/c_programs/armstrong number.cpp	
@@ -0,0 +1,32 @@
+#include<stdio.h>
+int main()
+	{
+	int num,orig,newnum=0,r=0;
+	printf("Enter a number");
+	scanf("%d",&num);
+	orig=num;
+	while(num!=0)
+	{
+		r= num%10;
+		newnum=newnum+r*r*r;
+		num=num/10;
+	}
+	printf("new number is%d",newnum);
+	 if(newnum==orig)
+	 {
+	 	printf("number is armstrong");
+	 }
+      else
+      	{
+      		printf("number is not armstrong");
+		  }
+	  
+	 
+	 
+	 
+	 
+	 
+}
+
+
+
diff --git a/c_programs/c_programs/armstrong number.exe b/c_programs/c_programs/armstrong number.exe
new file mode 100644
index 0000000..e3070a4
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diff --git a/c_programs/c_programs/armstrong numbr using recursion.cpp b/c_programs/c_programs/armstrong numbr using recursion.cpp
new file mode 100644
index 0000000..2aad76a
--- /dev/null
+++ b/c_programs/c_programs/armstrong numbr using recursion.cpp	
@@ -0,0 +1,26 @@
+#include<stdio.h>
+int armstrong(int);
+int main()
+{
+	int n,ans;
+	printf("Enter a three digit number n = ");
+	scanf("%d",&n);
+     ans=armstrong(n);
+     if(ans==n)
+     {
+     	printf("%d is an armstrong number ",n);
+	 }
+	   else
+	   {
+	   	printf("%d is not an armstrong number ",n);
+	   }
+	
+} 
+int armstrong(int n)
+{
+	
+	if(n%10!=0)
+	return (n%10)*(n%10)*(n%10)+armstrong(n/10);
+	else 
+	return 0;
+}
diff --git a/c_programs/c_programs/armstrong numbr using recursion.exe b/c_programs/c_programs/armstrong numbr using recursion.exe
new file mode 100644
index 0000000..452cc12
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diff --git a/c_programs/c_programs/array using switch case.cpp b/c_programs/c_programs/array using switch case.cpp
new file mode 100644
index 0000000..e87bfbc
--- /dev/null
+++ b/c_programs/c_programs/array using switch case.cpp	
@@ -0,0 +1,53 @@
+#include<stdio.h>
+int main()
+ /*ARRAYS USING SWITCH CASE*/
+{
+	int a[10],c1=0,c2=0,ch,i;
+	printf("\nEnter 10 elements\n");
+	for(i=0;i<10;i++)
+	{
+		scanf("%d",&a[i]);
+	}
+	 printf("\n 1. SUM OF ARRAY = ");
+	 printf("\n 2. COUNT EVEN AND ODD ELEMENTS FROM ARRAY");
+	 printf("\n 3. SUM OF POSITIVE AND NEGATIVE ELEMENTS IN AN ARRAY");
+	 printf("\nEnter your choice = ");
+	 scanf("%d",&ch);
+	
+	   switch(ch)
+	   {
+	   	 case 1:
+	   	   printf("sum of array is");
+	   	    for(i=0;i<10;i++)
+	   	      c1=c1+a[i];
+	   	       printf("sum of array elements is %d",c1);
+	   	       break;
+	   	 case 2:
+	   	 	printf("even and odd elements from array ");
+	   	 	 for(i=0;i<10;i++)
+	   	 	  {
+	   	 	  	if(a[i]%2==0)
+	   	 	  	   c1++;
+	   	 	  	else
+	   	 	  	  c2++;
+				  }
+	   	 	printf("\n even=%d \n odd=%d",c1,c2);
+	          break;
+	   	  case 3:
+	   	  	printf("count positive and negative elements in array");
+	   	  	for(i=0;i<10;i++)
+	   	  	{
+	   	  		if(a[i]>0)
+	   	  		  c1=c1+a[i];
+	   	  		else if(a[i]<0)
+	   	  		   c2=c2+a[i];
+	   	  		    
+				 }
+		
+				printf("\n positive=%d \n negative=%d",c1,c2);
+				break;
+				default:
+				printf("invalid choice");
+				break; 
+	   }
+}
diff --git a/c_programs/c_programs/array using switch case.exe b/c_programs/c_programs/array using switch case.exe
new file mode 100644
index 0000000..0e7566a
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diff --git a/c_programs/c_programs/arrays using switch case.cpp b/c_programs/c_programs/arrays using switch case.cpp
new file mode 100644
index 0000000..a509cbf
--- /dev/null
+++ b/c_programs/c_programs/arrays using switch case.cpp	
@@ -0,0 +1,49 @@
+#include<stdio.h>
+int main()
+{
+	/* ARRAYS USING SWITCH-CASE*/
+	int a[10],i,ch,s=0,c1=0,c2=0;
+	printf("Enter 10 numbers=");
+	for(i=0;i<10;i++)
+	{
+		scanf("\n %d",&a[i]);
+	}
+	printf("\n 1.SUM OF ARRAY");
+	printf("\n 2.COUNT EVEN AND ODD ELEMENTS FROM ARRAY");
+	printf("\n 3.SUM OF POSITIVE AND NEGATIVE VALUES IN ARRAY");
+	printf("\n Enter your choice");
+	scanf("%d",ch);
+	switch(ch)
+	{
+	   case 1:
+	      for(i=0;i<10;i++)
+	        s=s+a[i];
+	        printf("\n sum of array = %d",s);
+	         break;
+	     case 2:
+	     for(i=0;i<10;i++)
+	      {
+	          if(i%2==0)      	
+	      	   c1++;
+	      	   else
+	      	  c2++;
+		  }
+	   printf("\n Even = %d\n Odd = %d",c1,c2);
+	    break;
+	
+	      case 3:
+	           for(i=0;i<10;i++)
+	             {
+	             	if(a[i]>0)
+	             	    c1=c1+a[i];
+	             	else if(a[i]<0)
+	             	  c2=c2+a[i];
+	             	
+				 }
+	     printf("\n Positive = %d\n Negative = %d",c1,c2);
+		break;
+		default:
+		printf("invalid choice");
+	}
+	
+}
diff --git a/c_programs/c_programs/arrays using switch case.exe b/c_programs/c_programs/arrays using switch case.exe
new file mode 100644
index 0000000..e75d613
Binary files /dev/null and b/c_programs/c_programs/arrays using switch case.exe differ
diff --git a/c_programs/c_programs/average of 5 numbers using pointers with no arguments, no returns.cpp b/c_programs/c_programs/average of 5 numbers using pointers with no arguments, no returns.cpp
new file mode 100644
index 0000000..53b879d
--- /dev/null
+++ b/c_programs/c_programs/average of 5 numbers using pointers with no arguments, no returns.cpp	
@@ -0,0 +1,20 @@
+#include<stdio.h>
+void average(void);
+void main()
+{
+	int a,b,c,d,e,sum;
+	float average;
+	printf("Enter 5 numbers");
+	scanf("%d%d%d%d%d",&a,&b,&c,&d,&e);
+	
+	printf("Average is %f",average);
+	
+}
+ void average(void)
+{
+	int a,b,c,d,e;
+	float sum,avg;
+	sum=a+b+c+d+e;
+	avg=(a+b+c+d+e)/5;
+}
+
diff --git a/c_programs/c_programs/average of numbers using arrays.cpp b/c_programs/c_programs/average of numbers using arrays.cpp
new file mode 100644
index 0000000..e47b17e
--- /dev/null
+++ b/c_programs/c_programs/average of numbers using arrays.cpp	
@@ -0,0 +1,15 @@
+#include<stdio.h>
+int main()
+{
+int a[5],i,sum=0;	
+	float average;
+	printf("Enter five numbers");
+	scanf("%d",&a[i]);
+	for(i=0;i<=4;i++)
+	 sum=sum+a[i];
+	 average=sum/5.0;
+	 printf("average is%f",average);
+	 
+	 
+}
+
diff --git a/c_programs/c_programs/average of numbers using arrays.exe b/c_programs/c_programs/average of numbers using arrays.exe
new file mode 100644
index 0000000..13ce6ae
Binary files /dev/null and b/c_programs/c_programs/average of numbers using arrays.exe differ
diff --git a/c_programs/c_programs/binary pattern.cpp b/c_programs/c_programs/binary pattern.cpp
new file mode 100644
index 0000000..98cf672
--- /dev/null
+++ b/c_programs/c_programs/binary pattern.cpp	
@@ -0,0 +1,20 @@
+#include<stdio.h>
+int main()
+{
+	int i,j,k;
+	 for(i=1;i<=6;i++)
+	{
+		   k=1;
+		for(j=1;j<=6;j++)
+		{
+		
+		   if(j<=i)
+		     printf("%d",k);
+		       k=1-k;
+		   }
+		   else
+		      printf(" ");
+	}
+	   printf("\n");
+}
+}
diff --git a/c_programs/c_programs/c bootcamp assignment 2.rtf b/c_programs/c_programs/c bootcamp assignment 2.rtf
new file mode 100644
index 0000000..d2d6000
--- /dev/null
+++ b/c_programs/c_programs/c bootcamp assignment 2.rtf	
@@ -0,0 +1,603 @@
+{\rtf1\ansi\ansicpg1252\deff0\nouicompat\deflang1033{\fonttbl{\f0\fnil\fcharset0 Calibri;}}
+{\*\generator Riched20 10.0.17763}\viewkind4\uc1 
+\pard\sa200\sl276\slmult1\f0\fs22\lang9 #include<stdio.h>\par
+int main()\par
+\{\par
+int a;\tab\par
+\tab printf("Enter the value of a=");\par
+\tab scanf("%d",&a);\par
+\tab if(a%2==0)\par
+\tab\par
+\tab   printf("number is even %d",a);\par
+\tab else\par
+\tab  printf(" number is odd %d",a);\par
+\}\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab char c;\par
+\tab int uppercase_vowel,lowercase_vowel;\par
+\tab printf("Enter a character");\par
+\tab scanf("%c",c);\par
+\tab uppercase_vowel=(c=='a'||c=='e'||c ='i'||c=='o'||c=='u');\par
+    lowercase_vowel=(c=='A'||c=='E'||c=='I'||c='O'C=='U');\par
+\tab  if(uppercase_vowel||lowercase_vowel)\par
+         printf("vowel");\tab\par
+\tab\tab else\par
+\tab         printf("consonant");\par
+\}\par
+\}\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int a,b,c;\par
+\tab printf("Enter three numbers");\par
+\tab scanf("%d%d%d",&a,&b,&c);\par
+\tab a>b?a>c?a:c:b>c?b:c;\par
+\par
+\}\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int a;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&a);\par
+\tab if(a>0)\par
+\tab   printf("positive");\par
+\tab else\par
+\tab   printf("negative");\par
+\}\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int year;\par
+\tab printf("Enter a year");\par
+\tab scanf("%d",&year);\par
+\tab if(year%4==0)\par
+\tab\{\par
+\tab\tab if(year%100==0)\par
+\tab\tab\{\par
+\tab\tab\tab if(year%400==0)\par
+\tab\tab\tab printf("leap");\par
+\tab\tab\}\par
+\tab\tab else\par
+\tab\tab   printf("not leap");\par
+\tab\tab\par
+\tab\}\par
+\tab\par
+\}\par
+\par
+#include<stdio.h>\par
+int main()\par
+\tab\{\par
+\tab int num,orig,newnum=0,r=0;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&num);\par
+\tab orig=num;\par
+\tab while(num!=0)\par
+\tab\{\par
+\tab\tab r= num%10;\par
+\tab\tab newnum=newnum+r*r*r;\par
+\tab\tab num=num/10;\par
+\tab\}\par
+\tab printf("new number is%d",newnum);\par
+\tab  if(newnum==orig)\par
+\tab  \{\par
+\tab  \tab printf("number is armstrong");\par
+\tab  \}\par
+      else\par
+      \tab\{\par
+      \tab\tab printf("number is not armstrong");\par
+\tab\tab  \}\par
+\}\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\tab\{\par
+\tab int num,orig,newnum=0,r=0;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&num);\par
+\tab orig=num;\par
+\tab while(num!=0)\par
+\tab\{\par
+\tab\tab r= num%10;\par
+\tab\tab newnum=newnum+r*r*r;\par
+\tab\tab num=num/10;\par
+\tab\}\par
+\tab printf("new number is%d",newnum);\par
+\tab  if(newnum==orig)\par
+\tab  \{\par
+\tab  \tab printf("number is armstrong");\par
+\tab  \}\par
+      else\par
+      \tab\{\par
+      \tab\tab printf("number is not armstrong");\par
+\tab\tab   \}\par
+\}\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab char ch;\par
+\tab printf("Enter a character");\par
+\tab scanf("%c",&ch);\par
+\tab if(ch>='A' && ch<='Z')\par
+\tab\{\par
+\tab   printf("%c",ch+32);  //convert to lowercase\par
+     \}\par
+\tab  else\par
+\tab  \{\par
+\tab  \tab if(ch>='a' && ch<='z')\par
+\tab  \tab\{\par
+\tab  \tab\tab printf("%c",ch-32);\par
+\tab  \tab\tab else\{\par
+\tab\tab\tab  \par
+\tab  \tab\tab printf("invalid choice");\par
+\tab  \tab\}\par
+\tab\tab  \}\par
+\tab\par
+\tab  \}\tab   \par
+\}\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+ int a[6]=\{3,5,8,14,67,89\};\par
+\tab int i, largest;\par
+\tab for(i=0;i<6;i++)\par
+\tab\{\par
+\tab\tab if(a[i]>largest)\par
+\tab\tab\{\par
+\tab\tab\tab printf("%d",largest);\par
+\tab\tab\}\par
+\tab\tab\par
+\tab\tab\par
+\tab\}\par
+\}\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int a[6]=\{10,20,30,40,50,60\};\par
+\tab int i,sum=0;\par
+\tab for(i=0;i<=6;i++)\par
+\tab\{\par
+\tab\tab sum=sum+a[i];\par
+\tab\tab\par
+\tab\}\par
+\tab printf("sum is %d\\n",sum);\par
+\}\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+int a[5],i,sum=0;\tab\par
+\tab float average;\par
+\tab printf("Enter five numbers");\par
+\tab scanf("%d",&a[i]);\par
+\tab for(i=0;i<=4;i++)\par
+\tab  sum=sum+a[i];\par
+\tab  average=sum/5.0;\par
+\tab  printf("average is%f",average);\par
+\tab  \par
+\tab  \par
+\}\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int i,j;\par
+\tab char k;\par
+\tab for(i=1;i<=3;i++)\par
+\tab\{\par
+\tab   k='A';\par
+\tab  for(j=1;j<=3;j++)\par
+\tab  \{\par
+\tab  \par
+\tab\tab if(j<=i)\par
+\tab\tab printf("%c",k);\par
+\tab\tab k++;\par
+\tab\}\par
+\tab\tab else\par
+\tab\tab  printf(" ");\par
+\tab\tab\par
+\tab\tab\par
+\tab\}\par
+\tab printf("\\n");\par
+\}\par
+\}\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int i,j;\par
+\tab for(i=1;i<=4;i++)\par
+\tab\{\par
+\tab\tab for(j=1;j<=4;j++)\par
+\tab\tab\{\par
+\tab\tab\tab if(j>=i&&j<=4)\par
+\tab\tab\tab  printf("1");\par
+\tab\tab\tab   else\par
+\tab\tab\tab   printf(" ");\par
+\tab\tab\}\par
+\tab\tab printf("\\n");\par
+\tab\}\par
+\}\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int i,j,k;\par
+\tab for(i=1;i<=5;i++)\par
+\tab\{\par
+\tab\tab k=1;\par
+\tab\tab for(j=1;j<=5;j++)\par
+\tab\tab\{\par
+\tab\tab\tab if(j<6-i)\par
+\tab\tab\tab\{\par
+\tab\tab\tab\tab printf("%d",k);\par
+\tab\tab\tab\tab k=1-k;\par
+\tab\tab\tab\tab\par
+\tab\tab\tab\}\par
+\tab\tab\tab else\par
+\tab\tab\tab printf(" ");\par
+\tab\tab\}\par
+\tab\tab printf("\\n");\par
+\tab\}\par
+\par
+\}\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int i,j,k;\par
+\tab for(i=1;i<=5;i++)\par
+\tab\{\par
+\tab\tab k=5-i;\par
+\tab\tab for(j=1;j<=7;j++)\par
+\tab\tab\{\par
+\tab\tab\tab if(j<=5-k||j>=3+k)\par
+\tab\tab\tab    printf("*");\par
+\tab\tab\tab    k++;\par
+\tab\tab\tab  else\par
+\tab\tab\tab    printf("  ");\par
+\tab\tab\}\par
+\tab\tab\par
+\tab\tab printf("\\n");\par
+\tab\}\par
+\tab\par
+\par
+\}\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int x,y=0,r;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&x);\par
+\tab while(x!=0)\par
+\tab\{\par
+\tab\tab r=x%10;\par
+\tab\tab y=y*10+r;\par
+\tab\tab x=x/10;\par
+\tab\tab\par
+\tab\}\par
+\tab\par
+\tab printf("Reverse of number is %d",y);\par
+\tab\par
+\tab\par
+\}\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int num,rev=0,r,orig;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&num);\par
+\tab orig=num;\par
+\tab while(num!=0)\par
+\tab\{\par
+\tab\tab r=num%10;\par
+\tab\tab rev=rev*10+r;\par
+\tab\tab num=num/10;\par
+\tab\}\par
+\tab printf("Reverse number is%d",rev);\par
+\tab      if(orig==rev)\par
+\tab\{\par
+\tab\tab printf("number is palindrome\\n");\par
+\tab\}\par
+\tab    else\par
+\tab    \{\par
+\tab    \par
+\tab printf("number is not a palindrome");\par
+\tab\par
+      \}\par
+\par
+\}\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\tab\{\par
+\tab int num,orig,newnum=0,r=0;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&num);\par
+\tab orig=num;\par
+\tab while(num!=0)\par
+\tab\{\par
+\tab\tab r= num%10;\par
+\tab\tab newnum=newnum+r*r*r;\par
+\tab\tab num=num/10;\par
+\tab\}\par
+\tab printf("new number is%d",newnum);\par
+\tab  if(newnum==orig)\par
+\tab  \{\par
+\tab  \tab printf("number is armstrong");\par
+\tab  \}\par
+      else\par
+      \tab\{\par
+      \tab\tab printf("number is not armstrong");\par
+\tab\tab   \}\par
+\tab\}\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\par
+ int N,c,i,a=-1,b=1;\par
+ printf("Enter a number");\par
+scanf("%d",&N);\par
+for(i=1;i<=N;i++)\par
+\{\par
+\tab c=a+b;\par
+\tab printf("%d",c);\par
+\tab  a=b;\par
+\tab b=c;\par
+\tab\par
+\}\par
+\par
+\}\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+ int A[3][3],B[3][3],C[3][3],i,j,sum;\tab\par
+\tab printf("Enter 9 numbers for first matrix");\par
+\tab for(i=0;i<=2;i++)\par
+\tab for(j=0;j<=2;j++)\par
+\tab scanf("%d",&A[i][j]);\par
+\tab printf("Enter 9 numbers for second matrix");\par
+\tab for(i=0;i<=2;i++)\par
+\tab for(j=0;j<=2;j++)\par
+\tab scanf("%d",&B[i][j]);\par
+\tab printf("sum of matrices is \\n");\par
+\tab for(i=0;i<=2;i++)\par
+\tab\{\par
+\tab\tab for(j=0;j<=2;j++)\par
+\tab\tab\{\par
+\tab\tab C[i][j]=A[i][j]+B[i][j];\par
+\tab\tab printf("%d ",C[i][j]);\par
+\tab\tab\}\par
+\tab\tab printf("\\n");\par
+\tab\tab\par
+\tab\}\par
+\}\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int A[3][3],B[3][3],C[3][3],i,j,k,sum;\par
+\tab printf("Enter 9 numbers for first matrix");\par
+\tab for(i=0;i<=2;i++)\par
+\tab for(j=0;j<=2;j++)\par
+\tab scanf("%d",&A[i][j]);\par
+\tab printf("Enter 9 numbers for second matrix");\par
+\tab for(i=0;i<=2;i++)\par
+\tab for(j=0;j<=2;j++)\par
+\tab scanf("%d",&B[i][j]);\par
+\tab\par
+\tab for(i=0;i<=2;i++)\par
+\tab\{\par
+\tab\tab for(j=0;j<=2;j++)\par
+\tab\tab\{\par
+\tab\tab\tab sum=0;\par
+\tab\tab\tab for(k=0;k<=2;k++)\par
+\tab\tab\tab sum=sum+A[i][j]+B[i][j];\par
+\tab\tab\tab C[i][j]=sum;\par
+\tab\tab\}\par
+\tab\tab for(i=0;i<=2;i++)\par
+\tab\tab\tab\{\par
+\tab\tab\tab\par
+\tab\tab\tab for(j=0;j<=2;j++)\par
+             printf("%d",C[i][j]);\par
+\tab\tab\tab printf("\\n");\par
+\tab\tab\}\par
+\tab\tab\par
+\tab\tab printf("\\n");\par
+\tab\}\par
+\}\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int N,i,sum=0;\par
+\tab printf("Enter a natural number");\par
+\tab scanf("%d",&N);\par
+\tab for(i=1;i<=N;i++)\par
+\tab    sum=sum+1;\par
+\tab printf("sum is %d",sum);\par
+\}\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int a,b,L;\par
+\tab printf("Enter two numbers");\par
+\tab scanf("%d%d",&a,&b);\par
+\tab for(L-1;L<=a*b;L++)\par
+\tab\{\par
+\tab\tab if(L%a==0 && L%b==0)\par
+\tab\tab      \par
+\tab\tab  printf("LCM is L %d",L);\par
+\tab\tab\par
+\tab\}\par
+\}\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+}
+
\ No newline at end of file
diff --git a/c_programs/c_programs/c bootcamp assignment 3 pointers and functions.rtf b/c_programs/c_programs/c bootcamp assignment 3 pointers and functions.rtf
new file mode 100644
index 0000000..1238094
--- /dev/null
+++ b/c_programs/c_programs/c bootcamp assignment 3 pointers and functions.rtf	
@@ -0,0 +1,488 @@
+{\rtf1\ansi\ansicpg1252\deff0\nouicompat\deflang1033{\fonttbl{\f0\fnil\fcharset0 Calibri;}}
+{\*\generator Riched20 10.0.17763}\viewkind4\uc1 
+\pard\sa200\sl276\slmult1\f0\fs22\lang9\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int a,b,c,*p1,*p2,*p3;\par
+\tab printf("Enter two numbers");\par
+\tab scanf("%d%d",&a,&b);\par
+\tab p1=&a;\par
+\tab p2=&b;\par
+\tab p3=&c;\par
+\tab *p3=(*p1)+(*p3);\par
+\tab printf("sum is %d\\n",c);\par
+\}\par
+\par
+#include<stdio.h>\par
+void swap(int*,int*);\par
+int main()\par
+\{\par
+\tab int a,b;\par
+\tab printf("Enter value of a and b\\n");\par
+\tab scanf("%d%d",&a,&b);\par
+\tab\par
+\tab swap(&a,&b);\par
+\tab printf("After swapping value of a=%d and b=%d\\n",a,b);\par
+\tab\par
+\}\par
+\par
+void swap(int *x,int *y)\par
+\{\par
+\tab int temp;\par
+\tab temp=*x;\par
+\tab *x=*y;\par
+\tab *y=temp;\par
+\tab\par
+\}\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int a,b,c,*p1,*p2;\par
+\tab printf("Enter two numbers");\par
+\tab scanf("%d%d",&a,&b);\par
+    p1=&a;\par
+\tab p2=&b;\par
+\tab\par
+\tab *p1=*p1+*p2;\par
+\tab *p2=*p1-*p2;\par
+\tab *p1=*p1-*p2;\par
+\tab\par
+\tab printf("after swapping a is %d and b is %d",a,b);\par
+\tab\par
+\}\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int a,b,*p1,*p2;\par
+\tab *p1=&a;\par
+\tab *p2=&b;\par
+\tab printf("Enter the number");\par
+\tab scanf("%d%d",&a,&b);\par
+\tab\par
+\tab if(*p1>*p2)\par
+\tab   printf("largest number is %d",*p1);\par
+\tab   else\par
+\tab   printf("largest number is %d",*p2);\par
+\}\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int a[10],*p,i;\par
+\tab printf("Enter 10 elements");\par
+\tab scanf("%d",&a[i]);\par
+\par
+\tab   p=a;\par
+\tab   printf("array contains=");\par
+\tab   \{\par
+\tab   \par
+\tab  for(i=0;i<10;i++)\par
+\tab  \{\par
+\tab  \par
+\tab     printf("%d",*p);\par
+\tab   p++;\par
+\}\par
+\}\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int N,x,fact;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&N);\par
+\tab   x=fact(N);\par
+\tab printf("factorial is %d",x);\par
+\}\par
+int fact(int N)\tab\par
+\tab\{\par
+\tab\tab int i,f=1;\par
+\tab\tab for(i=1;i<=N;i++)\par
+\tab\tab f=f*i;\par
+\tab\tab return(f);\par
+\tab\tab\par
+\tab\}\par
+\tab\par
+\}\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+  int c1=0,c2=0;\par
+\tab char str[10],*p;\par
+\tab printf("Enter string=");\par
+\tab gets(str);\par
+\tab *p==(str);\par
+\tab while(*p!='\\0')\par
+\tab\{\par
+    if(*p=='A',||*p=='E'||*p=='I'||*p=='o'||*p=='U'||*p=='a'||*p=='e'||*p=='i'||*p=='o'||*p=='u')\par
+\tab\tab c1++;\par
+\tab\tab else\par
+\tab\tab c2++;\par
+\tab\}\par
+      printf("vowel =%d\\n consonant=%d",c1,c2);\par
+\}\par
+\}\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int a[10]=\{11,22,36,15,2\};\par
+\tab int sum=0,*p;\par
+\tab p=&a;\par
+\tab for(p=&a[0];p<=&a[4];p++)\par
+\tab   sum=sum+*p;\par
+\tab printf("sum is %d",sum);\par
+\}\par
+\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int a,b,c,*p1,*p2,*p3;\par
+\tab *p1=&a;\par
+\tab *p2=&b;\par
+\tab *p3=&c;\par
+\tab printf("Enter the number");\par
+\tab scanf("%d%d%d",&a,&b,&c);\par
+\tab if(*p1>*p2 && *p1>*p3)\par
+\tab    printf("largest number is %d",*p1);\par
+\tab    else\par
+\tab       if(*p2>*p1 && *p2>*p3)\par
+\tab         printf("largest number is %d",*p2);\par
+\tab         else \par
+\tab         printf("largest number is %d",*p3);\par
+\}\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+//program to demonstrate the use of functions in c \par
+void add(int x,int y);  //function prototype\par
+int main()\par
+\{\par
+ int x,y;\tab\par
+\tab printf("Enter ywo numbers");\par
+\tab scanf("%d%d",&x,&y);\par
+\tab add(x,y);   //function call\par
+\}\par
+void add(int a,int b)\par
+\{\par
+\tab int c;\par
+\tab c=a+b;          //function definition\par
+\tab printf("sum is %d",c);\par
+\tab return c;\par
+\}\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+int square (int);\par
+int main()\par
+\{\par
+  \tab int num,s;\par
+\tab printf("Enter a number");\par
+    scanf("%d",&num);\par
+    s=square(num);\par
+    printf("square of number is %d",s);\par
+\}\par
+   int square (int)\par
+\{\par
+\tab int a;\par
+\tab return(a*a);\par
+\}\par
+\par
+\par
+\par
+#include<stdio.h>\par
+void swap (int*,int*);\par
+int main()\par
+\{\par
+\tab int a,b;\par
+\tab printf("before swap a =%d and b=%d",a,b);\par
+\tab scanf("%d%d",&a,&b);\par
+\tab swap(&a,&b);\par
+\tab printf("after swap a=%d and b=%d",a,b);\par
+\tab\par
+\}\par
+void swap(int *p,int *q);\par
+\{\par
+   int p,q,temp,*p,*q;\tab\par
+\tab temp=*p;\par
+\tab *p=*q;\par
+\tab *q=*temp;\par
+\}\par
+\par
+\par
+#include<stdio.h>\par
+int oddeven(int);\par
+int main()\par
+\{\par
+\tab int num;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&num);\par
+\tab  if(num%2==0)\par
+\tab    printf("number is even");\par
+\tab else\par
+\tab   printf("number is odd");\par
+\}\par
+int oddeven(int);\par
+\{\par
+\tab int b;\par
+\tab a=b;\par
+\tab return(b%2==0);\par
+]\par
+\}\par
+\par
+\par
+#include<stdio.h>\par
+void checkprime(int n);\par
+\{\par
+\tab int num;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&num);\par
+\tab for(i=2;i<num-1;i++)\par
+\tab    if(x%i==0)\par
+\tab      break;\par
+\tab if(i==num)\par
+\tab  printf("%d is a prime number",num);\par
+\tab else\par
+\tab printf("%d is not a prime number",num);\par
+\}\par
+ void checkprime(int n)\par
+\{\par
+\tab int n\par
+\tab prime();\par
+\tab\par
+\tab\par
+\}\par
+\par
+\par
+\par
+#include<stdio.h>\par
+void armstrong (int n);\par
+\par
+\{\par
+\tab int num,sum=0,r,original_number;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&num);\par
+\tab original_number=num\par
+\tab while(num!=0)\par
+\tab\{\par
+\tab\tab r=num%10;\par
+\tab\tab sum=sum+r*r*r;\par
+\tab\tab num=num/10;\par
+\tab\}\par
+\tab printf("new number is %d",num);\par
+\tab if(sum=num)\par
+\tab   \{\par
+\tab   \tab printf("number is armstrong\\n");\par
+\tab   \}\par
+\tab else\par
+\tab\{\par
+\tab   printf("number is not armstrong\\n");\tab\par
+\tab\}\par
+ void armstrong(int n)\par
+\{\par
+  \par
+  armstrong();       //function call\par
+\}\par
+\par
+#include<stdio.h>\par
+int main()\par
+\{\par
+\tab int num,i,sum=0,rem;\par
+\tab printf("Enter a number");\par
+\tab scanf("%d",&num);\par
+\tab for(i=1;i<num;i++)\par
+\tab\{\par
+\tab\tab rem=num%i;\par
+\tab\tab  if(rem==0)\par
+\tab\tab\{\par
+\tab\tab\tab sum=sum+i;\par
+\tab\tab\}\par
+\tab\}\par
+   if(sum==num)\par
+     printf("perfect number is %d",num);\par
+      else \par
+         printf("not perfect number is %d",num);\par
+\}\par
+  void perfect number (int)\par
+   \{\par
+   \tab\par
+   \tab perfect number();\par
+   \tab\par
+   \}\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+void average(void);\par
+void main()\par
+\{\par
+\tab int a,b,c,d,e,sum;\par
+\tab float average;\par
+\tab printf("Enter 5 numbers");\par
+\tab scanf("%d%d%d%d%d",&a,&b,&c,&d,&e);\par
+\tab\par
+\tab printf("Average is %f",average);\par
+\tab\par
+\}\par
+ void average(void)\par
+\{\par
+\tab int a,b,c,d,e;\par
+\tab float sum,avg;\par
+\tab sum=a+b+c+d+e;\par
+\tab avg=(a+b+c+d+e)/5;\par
+\}\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+ square area ();\par
+ int main()\par
+\{\par
+  int a,square;\tab\par
+\tab printf("Enter side of square=");\par
+\tab scanf("%d",&a);\par
+\tab square=area(a*a);\par
+\tab print("\\nArea of square =%d",square);\par
+\}\par
+  area()\par
+\{\par
+\tab int a;\par
+\tab area=a*a;\par
+\tab return();\par
+\}\par
+\par
+\par
+#include<stdio.h>\par
+int volumecone(int r,int h,int v);\par
+int main()\par
+\{\par
+\tab float r,h;\par
+\tab printf("Enter the radius=");\par
+\tab scanf("%d",&r);\par
+\tab printf("Enter the height=");\par
+\tab scanf("%d",&h);\par
+\tab\par
+\}\par
+   int volumecone(int r,int h,int v)\par
+   \{\par
+   \tab int volume;\par
+   \tab v=v(0.33*3.14*r*r*h);\par
+   \tab printf("volume of cone=%f",volume);\par
+   \tab return(volume);\par
+   \}\par
+\par
+\par
+\par
+\par
+\par
+#include<stdio.h>\par
+//demonstrate the use of call by reference using functions\par
+void swap(int*,int*);\par
+int main()\par
+\{\par
+\tab int a,b;\par
+\tab printf("Enter two values");\par
+\tab scanf("%d%d",&a,&b);\par
+\tab printf("\\nBefore swapping a=%d,b=%d",a,b);\par
+\tab swap(&a,&b);\par
+\tab printf("\\nAfter swapping a=%d,b=%d ,a,b");\par
+\tab\par
+\}\par
+void swap(int*p,int*q)\par
+\{\par
+\tab int *p,*q,r;\par
+\tab r=*p;\par
+\tab *p=*q;\par
+\tab *q=r;\par
+\}\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+\par
+}
+
\ No newline at end of file
diff --git a/c_programs/c_programs/c bootcamp assignment.rtf b/c_programs/c_programs/c bootcamp assignment.rtf
new file mode 100644
index 0000000..0bdba36
Binary files /dev/null and b/c_programs/c_programs/c bootcamp assignment.rtf differ
diff --git a/c_programs/c_programs/calculate aggergate percentage of a student.cpp b/c_programs/c_programs/calculate aggergate percentage of a student.cpp
new file mode 100644
index 0000000..3b7c155
--- /dev/null
+++ b/c_programs/c_programs/calculate aggergate percentage of a student.cpp	
@@ -0,0 +1,20 @@
+#include<stdio.h>
+int main()
+{
+	int physics,chemistry,maths,english,computer;
+	float total,per;
+	printf("Enter the marks of physics = \n");
+	scanf("%d",&physics);
+	printf("Enter the  marks of chemistry = \n");
+	scanf("%d",&chemistry);
+	printf("Enter the marks of maths = \n");
+	scanf("%d",&maths);
+	printf("Enter the marks of english = \n");
+	scanf("%d",&english);
+	printf("Enter the marks of computer = \n");
+	scanf("%d",&computer);
+	total=physics+chemistry+maths+english+computer;
+	per=total/5.0;
+	printf("Aggregate percentage is %f",per);
+	
+}
diff --git a/c_programs/c_programs/calculate aggergate percentage of a student.exe b/c_programs/c_programs/calculate aggergate percentage of a student.exe
new file mode 100644
index 0000000..cabf009
Binary files /dev/null and b/c_programs/c_programs/calculate aggergate percentage of a student.exe differ
diff --git a/c_programs/c_programs/calculate gross salary.cpp b/c_programs/c_programs/calculate gross salary.cpp
new file mode 100644
index 0000000..e7a90d5
--- /dev/null
+++ b/c_programs/c_programs/calculate gross salary.cpp	
@@ -0,0 +1,22 @@
+#include<stdio.h>
+int main()
+{
+ float basic_salary,dearness_allowance,houserent_allowance,gross_salary;
+ printf("Enter basic salary of person\n");
+ scanf("%f",&basic_salary);
+   dearness_allowance=(40*basic_salary)/100;
+   houserent_allowance=(20*basic_salary)/100;
+	gross_salary=(basic_salary+dearness_allowance+houserent_allowance);
+	
+	printf("gross_salary of person is %f\n",gross_salary);
+}
+
+
+
+
+
+
+
+
+
+
diff --git a/c_programs/c_programs/calculate gross salary.exe b/c_programs/c_programs/calculate gross salary.exe
new file mode 100644
index 0000000..14bbf92
Binary files /dev/null and b/c_programs/c_programs/calculate gross salary.exe differ
diff --git a/c_programs/c_programs/calculate sum and average of first 10 integer numbers.cpp b/c_programs/c_programs/calculate sum and average of first 10 integer numbers.cpp
new file mode 100644
index 0000000..bf1cb96
--- /dev/null
+++ b/c_programs/c_programs/calculate sum and average of first 10 integer numbers.cpp	
@@ -0,0 +1,15 @@
+#include<stdio.h>
+int main()
+{
+	int i,sum=0;
+	float avg;
+	for(i=1;i<=10;i++)
+	{
+		sum=sum+i;
+	}
+	for(i=1;i<=10;i++)
+	avg=sum/10;
+	
+	printf("sum =%d\n",sum);
+	printf("avg =%d\n",avg);
+}
diff --git a/c_programs/c_programs/calculate sum and average of first 10 integer numbers.exe b/c_programs/c_programs/calculate sum and average of first 10 integer numbers.exe
new file mode 100644
index 0000000..06f3302
Binary files /dev/null and b/c_programs/c_programs/calculate sum and average of first 10 integer numbers.exe differ
diff --git a/c_programs/c_programs/calculate sum of odd and even from 1 to n using loops.cpp b/c_programs/c_programs/calculate sum of odd and even from 1 to n using loops.cpp
new file mode 100644
index 0000000..6a44493
--- /dev/null
+++ b/c_programs/c_programs/calculate sum of odd and even from 1 to n using loops.cpp	
@@ -0,0 +1,21 @@
+#include<stdio.h>
+int main()
+{
+	int n,i,j,sumo,sume;
+	printf("enter the value of n=");
+	scanf("%d",&n);
+	printf("odd numbers are \n");
+	for(i=1;i<=n;i=i+2)
+	{
+		printf("%d \t",i);
+		sumo=sumo+i;
+	}
+	printf("\n %d",sumo);
+	 printf("even numbers are \n");
+	for(j=2;j<=n;j=j+2)
+	   {
+	   	printf("%d \t",j);
+	   	sume=sume+j;
+	   }
+	printf("\n %d",sumo);
+}
diff --git a/c_programs/c_programs/calculate sum of odd and even from 1 to n using loops.exe b/c_programs/c_programs/calculate sum of odd and even from 1 to n using loops.exe
new file mode 100644
index 0000000..03eaf38
Binary files /dev/null and b/c_programs/c_programs/calculate sum of odd and even from 1 to n using loops.exe differ
diff --git a/c_programs/c_programs/call by reference using functions.cpp b/c_programs/c_programs/call by reference using functions.cpp
new file mode 100644
index 0000000..2cc0884
--- /dev/null
+++ b/c_programs/c_programs/call by reference using functions.cpp	
@@ -0,0 +1,21 @@
+#include<stdio.h>
+//demonstrate the use of call by reference using functions
+void swap(int*,int*);
+int main()
+{
+	int a,b;
+	printf("Enter two values");
+	scanf("%d%d",&a,&b);
+	printf("\nBefore swapping a=%d,b=%d",a,b);
+	swap(&a,&b);
+	printf("\nAfter swapping a=%d,b=%d ,a,b");
+	
+}
+void swap(int*p,int*q)
+{
+	int *p,*q,r;
+	r=*p;
+	*p=*q;
+	*q=r;
+}
+
diff --git a/c_programs/c_programs/character is vowel or consonant in string using pointers.cpp b/c_programs/c_programs/character is vowel or consonant in string using pointers.cpp
new file mode 100644
index 0000000..35dc097
--- /dev/null
+++ b/c_programs/c_programs/character is vowel or consonant in string using pointers.cpp	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+int main()
+{
+  int c1=0,c2=0;
+	char str[10],*p;
+	printf("Enter string=");
+	gets(str);
+	*p==(str);
+	while(*p!='\0')
+	{
+    if(*p=='A',||*p=='E'||*p=='I'||*p=='o'||*p=='U'||*p=='a'||*p=='e'||*p=='i'||*p=='o'||*p=='u')
+		c1++;
+		else
+		c2++;
+	}
+      printf("vowel =%d\n consonant=%d",c1,c2);
+}
diff --git a/c_programs/c_programs/check a given character is lower case alphabet or not.cpp b/c_programs/c_programs/check a given character is lower case alphabet or not.cpp
new file mode 100644
index 0000000..b1c5439
--- /dev/null
+++ b/c_programs/c_programs/check a given character is lower case alphabet or not.cpp	
@@ -0,0 +1,13 @@
+#include<stdio.h>
+int main()
+{
+	char c;
+	int a;
+	printf("enter a character");
+	scanf("%c",&c);
+	c=a;
+	if(c>=97 && c>=122)
+	   printf("lower case alphabet");
+	else
+	   printf("not a lower case alphabet");
+}
diff --git a/c_programs/c_programs/check a number is positive,negative,zero.cpp b/c_programs/c_programs/check a number is positive,negative,zero.cpp
new file mode 100644
index 0000000..a9cf945
--- /dev/null
+++ b/c_programs/c_programs/check a number is positive,negative,zero.cpp	
@@ -0,0 +1,13 @@
+#include<stdio.h>
+int main()
+{
+	int a;
+	  printf("Enter a number");
+	  scanf("%d",&a);
+	  if(a>0)
+	    printf("a is positive");
+	   else if(a<0)
+	      printf("a is negative");
+	      else
+	       printf("a is zero");
+}
diff --git a/c_programs/c_programs/check even or odd number.cpp b/c_programs/c_programs/check even or odd number.cpp
new file mode 100644
index 0000000..181e2c5
--- /dev/null
+++ b/c_programs/c_programs/check even or odd number.cpp	
@@ -0,0 +1,14 @@
+#include<stdio.h>
+int main()
+{
+int a;	
+	printf("Enter the value of a=");
+	scanf("%d",&a);
+	if(a%2==0)
+	
+	  printf("number is even %d",a);
+	else
+	 printf(" number is odd %d",a);
+
+}
+
diff --git a/c_programs/c_programs/check odd or even using functions.cpp b/c_programs/c_programs/check odd or even using functions.cpp
new file mode 100644
index 0000000..fb199fe
--- /dev/null
+++ b/c_programs/c_programs/check odd or even using functions.cpp	
@@ -0,0 +1,18 @@
+#include<stdio.h>
+/*takes nothing returns nothing function type  odd and even number function*/  
+void oddeven(void);
+int main()
+{
+	oddeven();
+}
+void oddeven(void)
+{
+	int a;
+	printf("Enter a number");
+	scanf("%d",&a);
+	if(a%2==0)
+	  printf("even number",a);
+	else
+	  printf("odd number",a);
+}
+
diff --git a/c_programs/c_programs/check pime or not using functions.cpp b/c_programs/c_programs/check pime or not using functions.cpp
new file mode 100644
index 0000000..5a5a3f0
--- /dev/null
+++ b/c_programs/c_programs/check pime or not using functions.cpp	
@@ -0,0 +1,21 @@
+#include<stdio.h>
+void checkprime(int n);
+{
+	int num;
+	printf("Enter a number");
+	scanf("%d",&num);
+	for(i=2;i<num-1;i++)
+	   if(x%i==0)
+	     break;
+	if(i==num)
+	 printf("%d is a prime number",num);
+	else
+	printf("%d is not a prime number",num);
+}
+ void checkprime(int n)
+{
+	int n
+	prime();
+	
+	
+}
diff --git a/c_programs/c_programs/check vowel or consonant.cpp b/c_programs/c_programs/check vowel or consonant.cpp
new file mode 100644
index 0000000..aeea95b
--- /dev/null
+++ b/c_programs/c_programs/check vowel or consonant.cpp	
@@ -0,0 +1,15 @@
+#include<stdio.h>
+int main()
+{
+	char c;
+	int uppercase_vowel,lowercase_vowel;
+	printf("Enter a character");
+	scanf("%c",c);
+	uppercase_vowel=(c=='a'||c=='e'||c ='i'||c=='o'||c=='u');
+    lowercase_vowel=(c=='A'||c=='E'||c=='I'||c='O'C=='U');
+	 if(uppercase_vowel||lowercase_vowel)
+         printf("vowel");	
+		else
+	        printf("consonant");
+}
+
diff --git a/c_programs/c_programs/check whether a input character if it is lowercase letter then convert to uppercase letter otherwise convert to lower case letter.cpp b/c_programs/c_programs/check whether a input character if it is lowercase letter then convert to uppercase letter otherwise convert to lower case letter.cpp
new file mode 100644
index 0000000..600fd17
--- /dev/null
+++ b/c_programs/c_programs/check whether a input character if it is lowercase letter then convert to uppercase letter otherwise convert to lower case letter.cpp	
@@ -0,0 +1,13 @@
+#include<stdio.h>
+int main()
+{
+	char c;
+	printf("enter a character");
+	scanf("%c",&c);
+	if(c>='A' && c<='Z')
+	   printf("it is uppercase letter \n lowercase letter %c",c+32);
+	  else if(c>='a' && c<='z')
+	     printf("it is lowercase letter \n uppercase letter %c",c-32);
+	     else
+	       printf("invalid choice");
+}
diff --git a/c_programs/c_programs/check whether a triangle is valid or not.cpp b/c_programs/c_programs/check whether a triangle is valid or not.cpp
new file mode 100644
index 0000000..5ba1433
--- /dev/null
+++ b/c_programs/c_programs/check whether a triangle is valid or not.cpp	
@@ -0,0 +1,11 @@
+#include<stdio.h>
+int main()
+{
+	int a,b,c;
+	printf("enter sides of triangle");
+	scanf("%d%d%d",&a,&b,&c);
+	if((a+b<=c)&&(a+c<=b)&&(b+c<=a))
+	   printf("triangle is valid");
+	else
+	  printf("triangle is invalid");
+}
diff --git a/c_programs/c_programs/compute sum of all array elements.cpp b/c_programs/c_programs/compute sum of all array elements.cpp
new file mode 100644
index 0000000..a032a50
--- /dev/null
+++ b/c_programs/c_programs/compute sum of all array elements.cpp	
@@ -0,0 +1,10 @@
+#include<stdio.h>
+int main()
+{
+	int a[10]={11,22,36,15,2};
+	int sum=0,*p;
+	p=&a;
+	for(p=&a[0];p<=&a[4];p++)
+	  sum=sum+*p;
+	printf("sum is %d",sum);
+}
diff --git a/c_programs/c_programs/convert degree fahrenheit into degree celsius.cpp b/c_programs/c_programs/convert degree fahrenheit into degree celsius.cpp
new file mode 100644
index 0000000..2906c0d
--- /dev/null
+++ b/c_programs/c_programs/convert degree fahrenheit into degree celsius.cpp	
@@ -0,0 +1,10 @@
+#include<stdio.h>
+int main()
+{
+	float cel,fr;
+	printf("Enter the temperature in fahrenhite =");
+	scanf("%f",&fr);
+	  cel=5.0/9*(fr-32);
+	printf("\n the temperature in celsius = %f\n",cel);
+	
+}
diff --git a/c_programs/c_programs/convert distance in meters,feet,inches,centimeters.cpp b/c_programs/c_programs/convert distance in meters,feet,inches,centimeters.cpp
new file mode 100644
index 0000000..a11c3cd
--- /dev/null
+++ b/c_programs/c_programs/convert distance in meters,feet,inches,centimeters.cpp	
@@ -0,0 +1,11 @@
+#include<stdio.h>
+int main()
+{
+	int d;
+	printf("enter the distance in kms");
+	scanf("%d",&d);
+	printf("the distance in meters = %d\n",d*1000);
+	printf("the distance in feet = %d\n",d*3281);
+	printf("the distance in inches = %d\n,d*39370");
+	printf("the distance in centimeter = %d\n",d*100000);
+}
diff --git a/c_programs/c_programs/copy one array to another.cpp b/c_programs/c_programs/copy one array to another.cpp
new file mode 100644
index 0000000..2326cf0
--- /dev/null
+++ b/c_programs/c_programs/copy one array to another.cpp	
@@ -0,0 +1,33 @@
+#include<stdio.h>
+int main()
+{
+	int a[10],b[10],n,i,j;
+	printf("Enter the number");
+	scanf("%d",&n);
+	for(i=0;i<n;i++)
+	{
+      printf("Enter the array element=");	
+		scanf("%d",&a[i]);
+	}
+	printf("\narray elements are =\n");
+	for(i=0;i<n;i++)
+	{
+		printf("\n%d",a[i]);
+	}
+	
+	for(i=0;i<n;i++)
+	{
+	b[i]=a[i];
+  }
+   printf("\narray-1 elements are\n");  
+    for(i=0;i<n;i++)
+     {
+     	printf("\n%d",a[i]);
+	 }
+    printf("\narray-2 elements are\n");
+    for(i=0;i<n;i++)
+    {
+    	printf("\n%d",a[i]);
+    	
+	}
+}
diff --git a/c_programs/c_programs/cost price of an item.cpp b/c_programs/c_programs/cost price of an item.cpp
new file mode 100644
index 0000000..5147397
--- /dev/null
+++ b/c_programs/c_programs/cost price of an item.cpp	
@@ -0,0 +1,14 @@
+#include<stdio.h>
+int main()
+{
+	float s,p,c;
+	printf("Enter the selling price of 15 items = \n");
+	scanf("%f",&s);
+	printf("Enter the profit of 15 items = \n");
+	scanf("%f",&p);
+	/* CALCULATE COST PRICE OF ITEM */
+	
+	c=(s-p)/15;
+	printf("The cost price of an item is %f",c);
+	
+}
diff --git a/c_programs/c_programs/count how many times a number is present in an array.cpp b/c_programs/c_programs/count how many times a number is present in an array.cpp
new file mode 100644
index 0000000..f98b0d3
--- /dev/null
+++ b/c_programs/c_programs/count how many times a number is present in an array.cpp	
@@ -0,0 +1,18 @@
+#include<stdio.h>
+int main()
+{
+	int a[10],i,c=0,n;
+	printf("\nEnter 10 elements = \n");
+	for(i=0;i<10;i++)
+	{
+	scanf("\n%d",&a[i]);
+   }
+   printf("\n enter the number which you want to count");
+   scanf("%d",&a[i]);
+   for(i=0;i<10;i++)
+   {
+   	  if(a[i]==n)
+   	     c++;
+   }
+    printf("\n count = %d",c);
+}
diff --git a/c_programs/c_programs/count number of positive,negative and zero in array.cpp b/c_programs/c_programs/count number of positive,negative and zero in array.cpp
new file mode 100644
index 0000000..1f7cc53
--- /dev/null
+++ b/c_programs/c_programs/count number of positive,negative and zero in array.cpp	
@@ -0,0 +1,32 @@
+#include<stdio.h>
+int main()
+{
+	int a[10],i,n,posi,neg,zero;
+	printf("COUNT THE NUMBER OF POSITIVE,NEGATIVE,ZERO ELEMENT IN AN ARRAY");
+	printf(" \n Enter the number of elements = ");
+	scanf("\n %d",&n);
+	
+		for(i=0;i<n;i++)
+	{
+		printf("\nEnter the element =\n");
+		
+		scanf("%d",&a[i]);
+	}
+	printf("\n Array elements are\n");
+	for(i=0;i<n;i++)
+{
+	printf("\n%d",a[i]);
+}
+     for(i=0;i<n;i++)
+     {
+     	if(a[i]>0)
+     	 posi=a[i];
+     	else if(a[i]<0)
+     	neg=a[i];
+     	else
+     	zero=a[i];
+	 }
+	 printf("\n positive elements are = %d ",posi);
+	 printf("\n negative elements are = %d ",neg);
+	 printf("\n zero elements are = %d",zero);
+}
diff --git a/c_programs/c_programs/count positive,negative,zero elements in an aray.cpp b/c_programs/c_programs/count positive,negative,zero elements in an aray.cpp
new file mode 100644
index 0000000..6734416
--- /dev/null
+++ b/c_programs/c_programs/count positive,negative,zero elements in an aray.cpp	
@@ -0,0 +1,29 @@
+#include<stdio.h>
+int main()
+{
+	int a[10],n,i,posi=0,neg=0,zero=0;
+	printf("Enter the number");
+	scanf("%d",&n);
+	for(i=0;i<n;i++)
+	{
+		printf("\nEnter array element\n");
+		scanf("%d",&a[i]);
+	}
+	printf("Array elements are \n");
+	for(i=0;i<n;i++)
+	{
+		printf("%d",a[i]);
+	}
+	for(i=0;i<n;i++)
+	{
+		if(a[i]>0)
+		   posi++;
+		else if(a[i]<0)
+		    neg++;
+		    else
+		       zero++;
+	}
+	printf("positive numbers=%d",posi);
+	printf("negative number=%d",neg);
+	printf("zero numbers=%d",zero);
+}
diff --git a/c_programs/c_programs/cross star pattern with value of n.cpp b/c_programs/c_programs/cross star pattern with value of n.cpp
new file mode 100644
index 0000000..226ea1b
--- /dev/null
+++ b/c_programs/c_programs/cross star pattern with value of n.cpp	
@@ -0,0 +1,22 @@
+#include<stdio.h>
+int main()
+{
+	int i,j,n;
+	printf("enter value of n : ");
+	scanf("%d",&n);
+	for(i=1;i<=n;i++)
+	{
+		for(j=1;j<=n;j++)
+		{
+			if(j == i || j == n+1-i)
+			{
+				printf("*");
+			}
+			else
+			{
+				printf(" ");
+			}
+		}
+		printf("\n");
+	}
+}
diff --git a/c_programs/c_programs/cross star pattern.cpp b/c_programs/c_programs/cross star pattern.cpp
new file mode 100644
index 0000000..d2f048e
--- /dev/null
+++ b/c_programs/c_programs/cross star pattern.cpp	
@@ -0,0 +1,16 @@
+#include<stdio.h>
+int main()
+{
+	int i,j;
+	for(i=1;i<=7;i++)
+	{
+		for(j=1;j<=7;j++)
+		{
+			if(i==j || j==8-i)
+			 printf("*");
+			else 
+			 printf(" ");
+		}
+		printf("\n");
+	}
+}
diff --git a/c_programs/c_programs/cube of a number using functions.cpp b/c_programs/c_programs/cube of a number using functions.cpp
new file mode 100644
index 0000000..b37a0d6
--- /dev/null
+++ b/c_programs/c_programs/cube of a number using functions.cpp	
@@ -0,0 +1,15 @@
+#include<stdio.h>
+int cubeofnumber(int);
+int main()
+{
+	int num,c;
+	printf("Enter a number : ");
+	scanf("%d",&num);
+	c=cubeofnumber(num);
+	printf("Cube of number = %d",c);
+}
+int cubeofnumber(int x)
+{
+	
+	return x*x*x;
+}
diff --git a/c_programs/c_programs/date of birth of a person.cpp b/c_programs/c_programs/date of birth of a person.cpp
new file mode 100644
index 0000000..8691990
--- /dev/null
+++ b/c_programs/c_programs/date of birth of a person.cpp	
@@ -0,0 +1,14 @@
+#include<stdio.h>
+int main()
+{
+	int year,month,date;
+	printf("Enter date of birth of a person = ");
+	scanf("%d",&date);
+	printf("Enter month of birth of a person = ");
+	scanf("%d",&month);
+	printf("Enter year of birth of a person = ");
+	scanf("%d",&year);
+	printf("DATE OF BIRTH OF PERSON = %d/%d/%d ",date,month,year);
+	
+}
+
diff --git a/c_programs/c_programs/delete element from an array.cpp b/c_programs/c_programs/delete element from an array.cpp
new file mode 100644
index 0000000..2ab052a
--- /dev/null
+++ b/c_programs/c_programs/delete element from an array.cpp	
@@ -0,0 +1,24 @@
+#include<stdio.h>
+int main()
+{
+	int arr[100],position,c,n;
+	printf("enter number of elements in an array");
+	scanf("%d",&n);
+	for(c=0;c<n;c++)
+	{
+		printf("enter number =");
+		scanf("%d",&arr[c]);
+	}
+	printf("enter location from where you want to delete element from =");
+	scanf("%d",&position);
+	if(position>n+1)
+	 printf("deleting element is not possible");
+	else
+	{
+		for(c=position-1;c<n-1;c++)
+		arr[c]=arr[c+1];
+		printf("resultant array is =");
+		for(c=0;c<n-1;c++)
+		printf("%d",arr[c]);
+	}
+}
diff --git a/c_programs/c_programs/deletion of array elementys.cpp b/c_programs/c_programs/deletion of array elementys.cpp
new file mode 100644
index 0000000..4d4be26
--- /dev/null
+++ b/c_programs/c_programs/deletion of array elementys.cpp	
@@ -0,0 +1,29 @@
+#include<stdio.h>
+int main()
+{
+	int a[100],n,posi,i;
+	printf("Enter number of array elements = ");
+	scanf("%d",&n);
+	 for(i=0;i<=n;i++)
+	 {
+	 	scanf("\n%d",a[i]);
+	 }
+    printf("Array elements are = ");
+    for(i=0;i<=n;i++)
+    {
+    	printf("\n%d",a[i]);
+	}
+	printf("Enter position for deletion = ");
+	{
+		scanf("%d",&posi);
+	}
+	for(i=posi-1;i<n;i++)
+	{
+	   a[i]=a[i+1];	
+	}
+	printf("Array after deletion = ");
+	for(i=0;i<n-1;i++)
+	{
+		printf("\n%d",a[i]);
+	}
+}
diff --git a/c_programs/c_programs/determine a number is prime or not.cpp b/c_programs/c_programs/determine a number is prime or not.cpp
new file mode 100644
index 0000000..6e4f398
--- /dev/null
+++ b/c_programs/c_programs/determine a number is prime or not.cpp	
@@ -0,0 +1,19 @@
+#include<stdio.h>
+int main()
+{
+	int num,i;
+	printf("enter a number");
+	scanf("%d",&num);
+	i=2;
+	while(i<=num-1)
+	   {
+	if(num%i==0)
+	{
+	   printf("not a prime number");	
+		break;
+	}
+	  i++;
+	   }
+	   if(i==num)
+	     printf("prime number");
+}