2darray.cpp

#include <iostream>
using namespace std;
int main() {

    const int rows = 3;
    const int cols = 4;
    int temp[4] = { 0 };
    int matrix[rows][cols] = {
        {1, 2, 3, 4},
        {5, 6, 7, 8},
        {9, 10, 11, 12}
    };

    // temp = row0 , row0=row1, row1 = temp
    for (int i = 0; i < cols; i++)
    {
        temp[i] = matrix[0][i];
    }
    for (int i = 0; i < cols; i++)
    {
        matrix[0][i] = matrix[1][i];
    }
    for (int i = 0; i < cols; i++)
    {
        matrix[1][i] = temp[i];
    }


    for (int r = 0; r < rows; r++)
    {
        for (int c = 0; c < cols; c++)
        {
            cout << "   "<<matrix[r][c] << "   ";
        }
        cout << endl;
    }

    return 0;
}