如何在c++中传递和返回函数中的二维数组

void processArray(int* arr, int rows, int cols) {
    // 访问和操作二维数组元素
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            int element = arr[i * cols + j];
            // 具体操作...
        }
    }
}

int main() {
    const int rows = 3;
    const int cols = 4;
    int arr[rows][cols] = { {1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12} };
    processArray(reinterpret_cast<int*>(arr), rows, cols);
    return 0;
}

void processArray(int (&arr)[3][4]) {
    // 访问和操作二维数组元素
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 4; j++) {
            int element = arr[i][j];
            // 具体操作...
        }
    }
}

int main() {
    int arr[3][4] = { {1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12} };
    processArray(arr);
    return 0;
}

int** createArray(int rows, int cols) {
    int** arr = new int*[rows];
    for (int i = 0; i < rows; i++) {
        arr[i] = new int[cols];
    }
    return arr;
}

void processArray(int** arr, int rows, int cols) {
    // 访问和操作二维数组元素
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            int element = arr[i][j];
            // 具体操作...
        }
    }
    
    // 释放内存
    for (int i = 0; i < rows; i++) {
        delete[] arr[i];
    }
    delete[] arr;
}

int main() {
    const int rows = 3;
    const int cols = 4;
    int** arr = createArray(rows, cols);
    
    // 初始化二维数组
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            arr[i][j] = i * cols + j + 1;
        }
    }
    
    processArray(arr, rows, cols);
    
    return 0;
}