Q:
         
         
            
               Write a c program to find out sum of diagonal element of a matrix.
            
                      
         
             Answer
                        #include<stdio.h>
int main(){
  int a[10][10],i,j,sum=0,m,n;
  printf("\nEnter the row and column of matrix: ");
  scanf("%d %d",&m,&n);
  printf("\nEnter the elements of matrix: ");
  for(i=0;i<m;i++)
      for(j=0;j<n;j++)
           scanf("%d",&a[i][j]);
  printf("\nThe matrix is\n");
  for(i=0;i<m;i++){
      printf("\n");
      for(j=0;j<m;j++){
      printf("%d\t",a[i][j]);
      }
 }
 for(i=0;i<m;i++){
     for(j=0;j<n;j++){
          if(i==j)
              sum=sum+a[i][j];
     }
 }
 printf("\n\nSum of the diagonal elements of a matrix is: %d",sum);
 return 0;
}
Sample output:
Enter the row and column of matrix: 3 3
Enter the elements of matrix: 
2
3
5
6
7
9
2
6
7
The matrix is
2       3       5
6       7       9
2       6       7
Sum of the diagonal elements of a matrix is: 16
          
         
         
         
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