Matrix Diagonal Sum

Q : Write a ‘C’ program to find out sum of diagonal elements of a matrix using ‘C’.

Solution : 

#include<stdio.h>

#include<conio.h>

#define MAX 3

void main()

{

     int ar[MAX][MAX],i,j,r,c,sum=0;

     clrscr();

     for(r=0;r<MAX;r++)

     {

          for(c=0;c<MAX;c++)

          {

              printf("Enter Number>> ");

              scanf("%d",&ar[r][c]);

          }

     }

     printf("\n\tOutput\n\n");

     for(r=0;r<MAX;

r++)

     {

          for(c=0;c<MAX;c++)

          {

              printf("\t%d",ar[r][c]);

          }

          printf("\n");

     }

     for(r=0;r<MAX;r++)

     {

          for(c=0;c<MAX;c++)

          {

              if(c==r)

                   sum+=ar[r][c];

          }

     }

     printf("\n\tDiagona sum is %d",sum);

     getch();

}

Output

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