E3

#include "stdafx.h"
#include <iostream>
#include <fstream>

using namespace std;



int main()
{
    int N;
    cout << "Enter integer values: ";
    cin >> N;
    int *mass = new int[N];
    ifstream ff("text1.txt");
    if (!ff)
        return 0;
    for (int i = 0; i < N; i++)
    {
        ff >> mass[i];
        cout << mass[i] << " ";

    }
    for (int i = 1; i < N; i += 2) {

        int j = mass[i - 1];
        mass[i - 1] = mass[i];
        mass[i] = j;

    }
    cout << endl;

    cout << "New mass: " << endl;
    for (int i = 0; i < N; i++)
    {
        cout << mass[i] << " ";

    }

}