Multiplication of Two Matrices

/*
Write a program in C for Matrix Multiplication
*/

#include<stdio.h>

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 < n ; 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;
}