diff --git a/Matrix_programs/Diagnol_sum_of_matrix_elements.c b/Matrix_programs/Diagnol_sum_of_matrix_elements.c
new file mode 100644
index 0000000..5e4d797
--- /dev/null
+++ b/Matrix_programs/Diagnol_sum_of_matrix_elements.c
@@ -0,0 +1,84 @@
+/*
+Find sum of left  and right diagonals of a matrix :
+---------------------------------------
+Input the size of the square matrix : 4
+Input elements of matrix :
+2
+4
+3
+4
+2
+5
+7
+5
+8
+9
+3
+5
+8
+9
+5
+1
+The matrix is :
+   2   4   3   4
+   2   5   7   5
+   8   9   3   5
+   8   9   5   1
+Addition of the Right Diagonal elements is :11
+Addition of the  left Diagonal elements is :28
+*/
+#include<stdio.h>
+void main()
+   {
+     int i,j,a[50][50],sum=0,n,m=0,sum1;
+	 
+       printf("\n\nFind sum of left  and right diagonals of a matrix :\n");
+       printf("---------------------------------------\n");	 
+	 
+	 printf("Input the size of the square matrix : ");
+     scanf("%d", &n); 
+         m=n;
+	 printf("Input elements of matrix :\n");
+       for(i=0;i<n;i++)
+        {
+            for(j=0;j<n;j++)
+            {
+	           scanf("%d",&a[i][j]);
+            }
+        }  
+	 printf("The matrix is :\n");
+	 for(i=0;i<n;i++)
+	 {
+	   for(j=0;j<n ;j++)
+	     printf("% 4d",a[i][j]);
+	    printf("\n");
+	 }
+// calculate the sum of left diagonals
+	 for(i=0;i<n;i++)
+	 {
+           m=m-1;
+	   for(j=0;j<n ;j++)
+            {
+              if (j==m) 
+                {
+                  sum= sum+a[i][j];
+                }
+              
+            }
+	 }
+	 //right diagnol  sum
+	 for(i=0;i<n;i++)
+	 {
+           m=m-1;
+	   for(j=0;j<n ;j++)
+            {
+              if (i==j) 
+                {
+                  sum1= sum1+a[i][j];
+                }
+              
+            }
+	 }
+	  printf("Addition of the Right Diagonal elements is :%d\n",sum1);
+       printf("Addition of the  left Diagonal elements is :%d\n",sum);
+    }
diff --git a/Matrix_programs/Transpose_of_matrix.cpp b/Matrix_programs/Transpose_of_matrix.c
similarity index 100%
rename from Matrix_programs/Transpose_of_matrix.cpp
rename to Matrix_programs/Transpose_of_matrix.c