用c语言编程求两个矩阵的乘积

以下是使用 C 语言编写的两个矩阵相乘的代码：

#include <stdio.h>

int main()
{
    int m, n, p, q, i, j, k;
    printf("Enter the number of rows and columns of the first matrix: ");
    scanf("%d %d", &m, &n);
    int first[m][n];
    printf("Enter the elements of the first matrix:\n");
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < n; j++)
        {
            scanf("%d", &first[i][j]);
        }
    }
    printf("Enter the number of rows and columns of the second matrix: ");
    scanf("%d %d", &p, &q);
    if (n != p)
    {
        printf("The matrices cannot be multiplied.");
        return 0;
    }
    int second[p][q];
    printf("Enter the elements of the second matrix:\n");
    for (i = 0; i < p; i++)
    {
        for (j = 0; j < q; j++)
        {
            scanf("%d", &second[i][j]);
        }
    }
    int product[m][q];
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < q; j++)
        {
            product[i][j] = 0;
            for (k = 0; k < n; k++)
            {
                product[i][j] += first[i][k] * second[k][j];
            }
        }
    }
    printf("The product of the two matrices is:\n");
    for (i = 0; i < m; i++)
    {
        for (j = 0; j < q; j++)
        {
            printf("%d ", product[i][j]);
        }
        printf("\n");
    }
    return 0;
}

该程序首先要求用户输入两个矩阵的行数和列数，然后读取用户输入的矩阵元素。如果第一个矩阵的列数不等于第二个矩阵的行数，则程序输出错误消息并退出。如果两个矩阵可以相乘，则程序计算它们的乘积并将结果打印到屏幕上。