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

using namespace std;

void Z1(int *mass, int N);
void Z2(int *mass, int N);
void Z3(int *mass, int N);
void Z4(int *mass, int N);
void Z5(int *mass, int N);
void Z6(int *mass, int N);
void Z7(int *mass, int N);
void Z8(int *mass, int N);

int *mass;

int main()
{
	int N, key;
	cout << "Enter integer mass: ";
	cin >> N;
	mass = new int[N];
	ifstream ff("text.txt");
	if (!ff) {
		cout << "error";  return 0;
	}

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

	ff.close();
	cout << endl;
	cout << "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;
	cin >> key;
	switch (key) {
	case 1: Z1(mass, N); break;
	case 2: Z2(mass, N); break;
	case 3: Z3(mass, N); break;
	case 4: Z4(mass, N); break;
	case 5: Z5(mass, N); break;
	case 6: Z6(mass, N); break;
	case 7: Z7(mass, N); break;
	case 8: Z8(mass, N); break;
	default: cout << "error"; break;
	}
	delete[]mass;
	return 0;
}


void Z1(int *mass, int N)
{
	int value;
	cout << "enter value"; cin >> value;
	ofstream ofs("test.txt");
	int *newMass = new int[N + 1];
	for (int i = 0; i < N; i++)
	{
		newMass[i] = mass[i];
	}
	newMass[N] = value;
	N++;
	for (int i = 0; i < N; i++) {
		ofs << newMass[i] << endl;
		cout << newMass[i] << "  ";
	}
	ofs.close();
	delete[] newMass;
}

void Z2(int *mass, int N)
{
	ofstream ofs("test.txt");
	N--;
	int *newMass = new int[N];
	for (int i = 0; i < N; i++)
	{
		newMass[i] = mass[i];
	}
	for (int i = 0; i < N; i++) {
		ofs << newMass[i] << endl;
		cout << newMass[i] << "  ";
	}
	ofs.close();
	delete[] newMass;
}

void Z3(int *mass, int N)
{
	ofstream ofs("test.txt");
	int value;
	//cout << "Enter N: ";
	//cin >> N;
	cout << "enter value: "; cin >> value;
	int *newMass = new int[N+1];
	newMass[0] = value;
	for (int i = 1; i < N+1; i++)
	{
		newMass[i] = mass[i - 1];
	}
	newMass[]
	for (int i = 0; i < N+1; i++) {
		ofs << newMass[i] << endl;
		cout << newMass[i] << "  ";
	}
	delete[] mass;
	ofs.close();
}

void Z4(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;
}

void Z5(int *mass, int N)
{
	int NumAdd, AddEl;
	cout << "Enter N: ";
	cin >> N;

	int *newMass = new int[N];
	cout << "Enter the item number: ";
	cin >> NumAdd;
	cout << "Enter the new element: ";
	cin >> AddEl;
	for (int i = N; i > NumAdd; i--)
	{
		mass[i] = mass[i - 1];
	}
	mass[NumAdd] = AddEl;

	//delete[] mass;
	//mass = newMass;
}

void Z6(int *mass, int N)
{
	int d;
	cout << "Enter N: ";
	cin >> N;
	int *newMass = new int[N];
	cout << "enter the item you want to delete: ";
	cin >> d;
	for (int i = d; i < N; i++)

		mass[i] = mass[i + 1];
}

void Z7(int *mass, int N) {

}
void Z8(int *mass, int N) {

}

//delete[] mass;
//mass = newMass;

/*int NumAdd, AddEl;
	cout << "Enter the item number: ";
	cin >> NumAdd;
	int *NewMass = new int[N];
	for (int i=N; i>NumAdd; i--)
	{
		NewMass[i - 1] = mass[i];
	}
	cout << "Enter the new element: ";
	cin >> AddEl;
	NewMass[NumAdd] = AddEl;*/