C Program for printing the diagonal elements of a matrix

#include <stdio.h>
  
int main()
{
   int  first[10][10], result[10][10],m, n, i,j;
   // read the order of the first matrix.
   printf("Enter the number of rows and columns of matrix\n");
   scanf("%d%d", &m, &n);
    
   // reading the first matrix 
   printf("Enter the elements of first matrix\n");
   for (i = 0; i < m; i++)
      for (j = 0; j < n; j++)
         scanf("%d", &first[i][j]);
          
   
 // if 'i' and 'j' are equal print the diagonal element.
      
   for (i = 0; i < m; i++)
   {
    for (j = 0; j < n; j++)
        {
            if(i==j)
            {
                printf("%d \t",first[i][j]);
            }
        }
   }
        
 
   return 0;
}