如何在c++中更改二维数组中数字的位置？

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

int row1 = 0;  // 第一个元素所在的行
int col1 = 0;  // 第一个元素所在的列
int row2 = 1;  // 第二个元素所在的行
int col2 = 1;  // 第二个元素所在的列

int temp = arr[row1][col1];
arr[row1][col1] = arr[row2][col2];
arr[row2][col2] = temp;

for (int i = 0; i < 3; i++) {
    for (int j = 0; j < 3; j++) {
        cout << arr[i][j] << " ";
    }
    cout << endl;
}

#include <iostream>
using namespace std;

int main() {
    int arr[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
    int row1 = 0;
    int col1 = 0;
    int row2 = 1;
    int col2 = 1;

    int temp = arr[row1][col1];
    arr[row1][col1] = arr[row2][col2];
    arr[row2][col2] = temp;

    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }

    return 0;
}