first_cpp_commit

Author: partth-code

eighth.exe

@@ -0,0 +1,22 @@
+#include<iostream>
+
+int main()
+{
+
+    std::string name;
+    int age;
+
+    std::cin>>age;
+
+    //to get input with space we will use
+    std::cout<<"Enter your full name: ";
+    std::getline(std::cin>>std::ws,name);
+
+    std::cout<<'\n'<<"Enter your age: ";
+    
+
+    std::cout<<'\n'<<"Hi "<<name<<" your age is "<<age;
+
+    //note if we use getline() after cin it by default accepts a newline char and to avoid this we can use std::ws this will clear any newline char or white space after cin
+    return 0;
+}

eighth_cpp_file.cpp

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+#include <iostream>
+
+//'typedef' keyword is used when we want to reduse typos like whem we want to call one data type with other name,we inclued _t st hte end of  the new name to recognize typedef this additional name is called alias
+//this can also be done by using key word and that is more preferable as it hels in creating templates more efficiently
+typedef std::string  string_t;
+
+using num_t = int;
+
+int main()
+{
+    string_t a = "Hi there";
+    num_t r = 1;
+    return 0;
+}

fifth_cpp_file.cpp

@@ -0,0 +1,9 @@
+#include <iostream>  
+//it is a basic heaser file which contain info about the basic input output operations
+
+int main()
+{
+    std::cout<<"i like science"<<'\n'<<std::endl;
+    std::cout << "science is cool" <<'\n';
+    return 0;
+}

first_cpp_file.cpp

@@ -0,0 +1,36 @@
+#include <iostream>
+
+
+//  creating a namespace
+//they are used to avoid naming conflicts like we want to use diffrent values of same variable x but we cannot decleare x 2 times directly so we use namespace
+
+/*
+Note -:
+ if we use x from namespace first we have to write first::x
+ if we are usin x form namespace second we have to write second::xor
+
+ if we didnt mentioned any thing it will use x decllarend in the main 
+
+ if we wrote 
+ using namespace first 
+
+default value of x will be from namespace first and we have to mention if  we use it from secdond and viseversa
+*/
+
+namespace first
+{
+   int x = 2;
+}
+namespace second
+{
+    int x = 3;
+}
+
+int main()
+{
+    using namespace first;
+    
+
+    std::cout<<x;
+    return 0;
+}

forth_cpp_file.cpp

@@ -0,0 +1,22 @@
+#include <iostream>
+#include <cmath>
+
+
+int main()
+{
+    float base,perpendicular,hypotanious;
+    
+    //base input
+    std::cout<<"Enter the length of base for the right triangle: ";
+    std::cin>>base;
+
+    //perpendicular
+    std::cout<<'\n'<<"Enter the length of perpendicular for the right triangle: ";
+    std::cin>>perpendicular;
+
+    hypotanious  = sqrt(pow(base,2)+pow(perpendicular,2));
+
+    std::cout<<'\n'<<"Enter value for the hypotanious length is: "<<hypotanious;
+    
+    return 0;
+}

forth_cpp_file.exe

@@ -0,0 +1,24 @@
+#include<iostream>
+#include<cmath>
+
+
+int main()
+{
+    //some useful math related functions
+    double a = 3;
+    double b = 4;
+    double z;
+    z = std::max(a,b); // to get max of two numbers
+    z = std::min(a,b); // to get min of two numbers
+    z = pow(a,b);   // a to the power of b
+    z = sqrt(a); //square root of a
+    z = abs(-3); //modlus function
+    z = round(3.14); // return rounded value (not the floor or ceiling)
+    z = ceil(3.14); //return ceiling value 4 here
+    z = floor(3.14); //return the floor value 3 here
+
+  //Note -: there are many more functions in cmath
+
+
+    return 0;
+}

hybotanious_problem.cpp

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+#include<iostream>
+
+int main()
+{
+    /*
+     variables: they are the containers which are small chunks of the memory and each variable cossisponds to a specific memory loocation
+
+     the dype of data stored in the variable depends on the data type of the variable
+    */
+
+    //we can create variables in two ways
+
+    //way 1 ->
+    //declaration
+    int a;
+    //assignment
+    a = 4; 
+
+    //way 2 ->
+    //declaration with assignment
+
+    int b = 4;
+
+    /*
+    there are several basic datatypes -:
+
+    int :: fo integer value
+    double , float :: for real numbers or numbers with decimals
+    char :: for characters
+    string :: to store sequence of text ,like sentences ,words,paragraphs
+    bool :: to store true or false
+
+    not string is avilable in std namespace
+    */
+
+    int a = -1;
+    float b = 45.6;
+    double c = 65.4;
+    char d = '\n';
+    std::string  e = "science is all about exploration";
+    bool f = true;
+
+    std::cout <<a<<b<<c<<d<<e<<f<<std::endl;
+
+
+    return 0;
+}

ninth_cpp_file.cpp

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+#include <iostream>
+
+int main()
+{
+    /*
+     there are two types of type conversions possible
+
+     inplesit and explesit
+
+     implesit happen by their own while in explecit we need to specify
+
+    explesit conversion can be very usefu in integer division
+    */
+
+    int number_of_apples = 10;
+    int number_of_people = 11;
+
+    float apple_per_person = number_of_apples/number_of_people;
+
+    // here the result is not what which is expected and the reason for thsi is when integer is divvided by integer it gives an integer so we have t o type cast that integer to float in order to obtain a decimal value;
+
+    float apple_per_eater = number_of_apples/(float)number_of_people ;
+
+    std::cout<<apple_per_person<<'\n'<<apple_per_eater;
+
+    return 0;
+}

second_cpp_file.cpp

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+#include<iostream>
+//arithmatic operators
+
+int main()
+{
+    int students = 1;
+    students+=1;
+    students -= 1;
+    students *=2;
+    students /= 1;
+
+    std::cout<<students;
+
+    students++;
+    students--;
+
+    students = 3+4-4*5/6;
+
+    return 0;
+}

seventh.exe

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+#include <iostream>
+
+int main()
+{
+    //we can create constants with "const" key word before declearing a data type of the variable , as a convention we use uppercamelcase for their naming
+
+    //calculating area of the circle
+
+    const float PI = 3.14;
+    float radius = 23;
+
+    float area = PI*radius*radius;
+
+    std::cout<<"Area of the circle is: "<<area<<std::endl;
+    
+
+    return 0;
+}