E3

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

using namespace std;

void push_back(int *&mass, int &N, const int value);
void pop_back(int *&mass, int &N);
void push_front(int *&mass, int &N, const int value);
void pop_front(int *&mass, int &N);

int main()
{
    int N, ch, exit = 0;
    cout << "Enter integer values: ";
    cin >> N;
    int *mass = new int[N];
    ifstream ff("text.txt");
    if (!ff) {
        cout << "Sorry, we can't fle$$$ your file!";
        return 0;
    }

    for (int i = 0; i < N; i++)
    {
        ff >> mass[i];
        cout << mass[i] << " ";
    }
    ff.close();

    do {
        cout << endl << "1) Task 1" << endl << "2) Task 2" << endl << "3) Task 3" << endl << "4) Task 4" << endl << "5) Task 5" << endl << "6) Task 6" << endl << "7) Task 7" << endl << "8) Task 8" << endl << "9) Exit" << endl;
        cin >> ch;

        if (ch == 1) {
            int newEl;
            cout << "Enter the new element: ";
            cin >> newEl;
            push_back(mass, N, newEl);
            for (int i = 0; i < N; i++)
            {
                ff >> mass[i];
                cout << mass[i] << " ";
            }
        }

        else if (ch == 2) {
            pop_back(mass, N);
            for (int i = 0; i < N; i++)
            {
                ff >> mass[i];
                cout << mass[i] << " ";
            }

        }

        else if (ch == 3) {
            int newEl3;
            cout << "Enter the new element: ";
            cin >> newEl3;
            push_front(mass, N, newEl3);
            for (int i = 0; i < N; i++)
            {
                ff >> mass[i];
                cout << mass[i] << " ";
            }
        }

        else if (ch == 4) {
            pop_front(mass, N);
            for (int i = 0; i < N; i++)
            {
                ff >> mass[i];
                cout << mass[i] << " ";
            }
        }

        else if (ch == 9) exit = 1;

        else cout << endl << "We are apologize, but this part of program doesn't work." << endl << "Please, choose a correct task from menu or ask admin what to do and stand by." << endl;
    } while (exit != 1);



    delete[] mass;
    return 0;
}


void push_back(int *&mass, int &N, const int value)
{
    int *newMass = new int[N + 1];
    for (int i = 0; i < N; i++)
    {
        newMass[i] = mass[i];
    }
    newMass[N] = value;
    N++;

    delete[] mass;
    mass = newMass;
}

void pop_back(int *&mass, int &N)
{
    N--;
    int *newMass = new int[N];
    for (int i = 0; i < N; i++)
    {
        newMass[i] = mass[i];
    }

    delete[] mass;
    mass = newMass;
}

void push_front(int *&mass, int &N, const int value)
{
    cout << "Enter N: ";
    cin >> N;
    int *newMass = new int[N];
    newMass[0] = N;
    for (int i = 1; i < N; i++)
    {
        newMass[i] = mass[i - 1];
    }

    delete[] mass;
    mass = newMass;
}

void pop_front(int *&mass, int &N)
{

    int *newMass = new int[N];
    for (int i = 0; i < N - 1; ++i)
    {
        newMass[i] = mass[i + 1];
    }
    N--;

    delete[] mass;
    mass = newMass;
}