3*3二维数组行列互换c++

可以通过以下代码实现二维数组的行列互换：

#include <iostream>
using namespace std;

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

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

    // 输出原始数组
    cout << "Original array:" << endl;
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }

    // 二维数组行列互换
    int temp;
    for (int i = 0; i < ROWS; i++) {
        for (int j = i; j < COLS; j++) {
            temp = arr[i][j];
            arr[i][j] = arr[j][i];
            arr[j][i] = temp;
        }
    }

    // 输出行列互换后的数组
    cout << "After transpose:" << endl;
    for (int i = 0; i < ROWS; i++) {
        for (int j = 0; j < COLS; j++) {
            cout << arr[i][j] << " ";
        }
        cout << endl;
    }

    return 0;
}

输出结果为：

Original array:
1 2 3
4 5 6
7 8 9
After transpose:
1 4 7
2 5 8
3 6 9