用C++实现多维数组初始化

const int ROWS = 3;
const int COLS = 4;
int arr[ROWS][COLS];

for (int i = 0; i < ROWS; i++) {
    for (int j = 0; j < COLS; j++) {
        arr[i][j] = i * COLS + j;
    }
}

int arr[3][4] = {
    {1, 2, 3, 4},
    {5, 6, 7, 8},
    {9, 10, 11, 12}
};

const int ROWS = 3;
const int COLS = 4;
int arr[ROWS][COLS];

void initializeArray(int arr[][COLS], int row, int col) {
    if (row >= ROWS) {
        return;
    }
    if (col >= COLS) {
        initializeArray(arr, row + 1, 0);
        return;
    }
    arr[row][col] = row * COLS + col;
    initializeArray(arr, row, col + 1);
}

initializeArray(arr, 0, 0);