C Program to calculate sum of diagonal elements of a matrix

C Program to calculate sum of diagonal elements of a matrix | C Program to add Numbers diagonally | Diagonally add Elements of array in C

#include < stdio.h >
#include < conio.h > 

void main()
{
 int a[10][10],i,j,sum=0,r,c;
 clrscr();
 printf("\n Enter the number of rows and column ");
 scanf("%d%d",&r,&c);
 printf("\nEnter the %dX%d matrix",r,c);
 for(i=0;i < r;i++)
 {
  for(j=0;j<c;j++)
  {
   scanf("%d",&a[i][j]);
  }//for
 }//for
 for(i=0;i <r;i++)
 {
  for(j=0;j < c;j++)
  {
   if(i==j)
   {
    sum+=a[i][j];
   }
  }//for
 }//for
 printf("\nThe sum of diagonal elements is %d",sum);
}