fstream中的C++ 2d数组未正确存储

#include <iostream>
#include <fstream>

const int ROWS = 3;
const int COLS = 4;

void readArray(int arr[ROWS][COLS]) {
    std::ifstream file("data.txt");
    if (file.is_open()) {
        for (int i = 0; i < ROWS; i++) {
            for (int j = 0; j < COLS; j++) {
                file >> arr[i][j];
            }
        }
        file.close();
    } else {
        std::cout << "Failed to open file." << std::endl;
    }
}

void writeArray(int arr[ROWS][COLS]) {
    std::ofstream file("data.txt");
    if (file.is_open()) {
        for (int i = 0; i < ROWS; i++) {
            for (int j = 0; j < COLS; j++) {
                file << arr[i][j] << " ";
            }
            file << std::endl;
        }
        file.close();
    } else {
        std::cout << "Failed to open file." << std::endl;
    }
}

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

    writeArray(arr);

    int newArr[ROWS][COLS];
    readArray(newArr);

    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            std::cout << newArr[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}