Write a C program to find out the Sum of the diagonal elements of a matrix.

 Source code:

/*Write a C program to find out the Sum of the diagonal elements of a matrix. Consider a matrix as below:

1 2 3

4 5 6

7 8 9

The Sum of the diagonal elements of the above matrix is 15. */

#include<stdio.h>

int main(){

  int a[3][3],i,j,sum=0,m=3,n=3;

  /* Read the elements of the Matrix a */

printf("Enter a matrix:\n");

  for(i=0;i<m;i++)

      for(j=0;j<n;j++)

            scanf("%d",&a[i][j]);

  

for(i=0;i<m;i++){

      for(j=0;j<n;j++){

          if(i==j)

              sum=sum+a[i][j];

      }

  }

printf("Sum of the Diagonal elements of the matrix=%d",sum);

  return 0;

}

Output: