Program:

#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];
} //inner for loop ends

    multiply[c][d] = sum;
    sum = 0;
    } //middle for loop ends
   } //outer for loop ends

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");
    }
} //else ends
    return 0;
} //main ends

Output: