c++)我在将一维数组放入二维数组时出错

#include <iostream>

int main() {
    const int ROWS = 3;
    const int COLS = 4;

    // 创建一个一维数组
    int arr1[COLS] = {1, 2, 3, 4};

    // 创建一个二维数组
    int arr2[ROWS][COLS] = {0};

    // 将一维数组放入二维数组的第二行
    int row = 1;
    for (int col = 0; col < COLS; col++) {
        arr2[row][col] = arr1[col];
    }

    // 打印二维数组
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            std::cout << arr2[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}

0 0 0 0
1 2 3 4
0 0 0 0