Write a C program for matrix multiplication.

#include <stdio.h>

void 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");

    }

  }

}