#include <iostream>
#include "windows.h"
#include <vector>
#include <string>
#include <conio.h>

using namespace std;

HANDLE hCon = GetStdHandle(STD_OUTPUT_HANDLE);
#define WIDTH 80
#define HEIGHT 30

void MainGet();

int main()
{
    string resize = "mode "+ to_string(WIDTH)+ ", "+ to_string(HEIGHT);
    system(resize.c_str());
    MainGet();
}

void print(const char text[], int x, int y)
{
    COORD pos;
    pos.X = x;
    pos.Y = y;
    SetConsoleCursorPosition(hCon, pos);
    cout << text;
}

void MenuShow(int nomber)
{
    vector <string> points = {"sin", "cos", "simple function"};
    system("cls");
    int xMiddle = WIDTH / 2;
    int yPart = HEIGHT / (points.size() + 1);
    for (int i = 1; i <= points.size(); i++)
    {
        if (i == nomber)
        {
            string temp = "<<" + points[i - 1] + ">>";
            print(temp.c_str(), xMiddle - temp.length() / 2, yPart*i);
        }
        else
            print(points[i-1].c_str(), xMiddle - points[i - 1].length() / 2, yPart*i);
    }
}

void MainGet()
{
    int mode = 0; // 0 - menu, 1 - count get
    int menu_point = 1;
    MenuShow(menu_point);
    while (true)
    {
        int choice = _getch();
        if (!mode)
        {
            switch (choice)
            {
            case 72:
                menu_point = menu_point == 1 ? menu_point = 3 : menu_point - 1;
                break;
            case 80:
                menu_point = menu_point == 3 ? menu_point = 1 : menu_point + 1;
                break;
            }
            MenuShow(menu_point);
        }
        else
        {

        }
    }
}