使用malloc进行矩阵乘法，无需用户输入

int** matrixA;
matrixA = (int**)malloc(m * sizeof(int*));
for (int i = 0; i < m; i++) {
    matrixA[i] = (int*)malloc(n * sizeof(int));
}

int** matrixB;
matrixB = (int**)malloc(n * sizeof(int*));
for (int i = 0; i < n; i++) {
    matrixB[i] = (int*)malloc(p * sizeof(int));
}

// 为矩阵A赋随机值
for (int i = 0; i < m; i++) {
    for (int j = 0; j < n; j++) {
        matrixA[i][j] = rand() % 100; // 生成0到99之间的随机数
    }
}

// 为矩阵B赋随机值
for (int i = 0; i < n; i++) {
    for (int j = 0; j < p; j++) {
        matrixB[i][j] = rand() % 100; // 生成0到99之间的随机数
    }
}

int** matrixC;
matrixC = (int**)malloc(m * sizeof(int*));
for (int i = 0; i < m; i++) {
    matrixC[i] = (int*)malloc(p * sizeof(int));
}

for (int i = 0; i < m; i++) {
    for (int j = 0; j < p; j++) {
        matrixC[i][j] = 0; // 初始化矩阵C的元素为0
        for (int k = 0; k < n; k++) {
            matrixC[i][j] += matrixA[i][k] * matrixB[k][j];
        }
    }
}

printf("矩阵C的结果：\n");
for (int i = 0; i < m; i++) {
    for (int j = 0; j < p; j++) {
        printf("%d ", matrixC[i][j]);
    }
    printf("\n");
}

for (int i = 0; i < m; i++) {
    free(matrixA[i]);
}
free(matrixA);

for (int i = 0; i < n; i++) {
    free(matrixB[i]);
}
free(matrixB);

for (int i = 0; i < m; i++) {
    free(matrixC[i]);
}
free(matrixC);