C Program for Matrix Multiplication

#include <stdio.h>
 

int main()
{
   int m, n, p, q, c, d, k, sum = 0;
  int first[10][10], second[10][10], multiply[10][10];
 
   printf("Enter the number of rows and columns of first matrix\n");
   scanf("%d%d", &m, &n);
   printf("Enter the elements of first matrix\n");
 


   for (c=0;c < m;c++)
      for (d=0;d < n;d++)
   scanf("%d",&first[c][d]);
 
   printf("Enter the number of rows and columns of second matrix\n");
   scanf("%d%d", &p, &q);
 
   if ( n != p )
      printf("Matrices with entered orders can't be multiplied with each other.\n");
   else
   {
      printf("Enter the elements of second matrix\n");
 
      for(c=0;c < p;c++)
         for (d=0;d < q;d++)
           scanf("%d", &second[c][d]);
 





      for ( c = 0 ; c < m ; c++ )
      {
         for ( d = 0 ; d < q ; d++ )
         {
           for ( k = 0 ; k < p ; k++ )
           {
              sum = sum + first[c][k]*second[k][d];
     }
    multiply[c][d] = sum;
           sum = 0;
         }
      }
 
      printf("Product of entered matrices:-\n");
 
      for ( c = 0 ; c < m ; c++ )
      {
         for ( d = 0 ; d < q ; d++ )
          printf("%d\t", multiply[c][d]);
         printf("\n");
      }
   }
 
  return 0;
}
</stdio.h>



OUTPUT

Enter the number of rows and columns of first matrix
3
3
Enter the elements of first matrix
1 2 3
4 5 6
7 8 9
Enter the number of rows and columns of second matrix
3 3
Enter the elements of second matrix
9 8 7
6 5 4
3 2 1
Product of entered matrices:-
30       24      18
84       69      54
138     114     90