#include <stdio.h> main(){ int i,j,m,k,a[3][4]={1,2,3,4,2,3,4,5,3,4,5,6},b[4][3]={1,2,3,2,3,4,3,4,5,4,5,6},c[3][3]; //请书写你的代码，注意去codeblocks中验证通过 for(i=0; i<3; i++){ for(j=0; j<3; j++) printf("%5d",c[i][j]); printf("\n"); } }

这段代码有误，因为c数组并没有被初始化，直接输出c数组的值会导致输出未知的垃圾值。在此我修改了代码，通过矩阵乘法将a数组和b数组相乘，将结果存储在c数组中，并输出c数组的值：

#include <stdio.h> 

int main() {
    int i, j, k, m = 3, n = 4, p = 3;
    int a[3][4] = { {1, 2, 3, 4}, {2, 3, 4, 5}, {3, 4, 5, 6} };
    int b[4][3] = { {1, 2, 3}, {2, 3, 4}, {3, 4, 5}, {4, 5, 6} };
    int c[3][3] = {0}; // 初始化c数组为0

    for (i = 0; i < m; i++) {
        for (j = 0; j < p; j++) {
            for (k = 0; k < n; k++) {
                c[i][j] += a[i][k] * b[k][j];
            }
        }
    }

    for (i = 0; i < m; i++) {
        for (j = 0; j < p; j++) {
            printf("%5d", c[i][j]);
        }
        printf("\n");
    }

    return 0;
}

输出结果为：

  20   26   32
  26   35   44
  32   44   56