#include <iostream>
#include <cmath>
#include <clocale>

using namespace std;

int main()
{
setlocale(LC_ALL, "russian");
double x, y;

cout << "Введите х: ";
cin >> x;
cout << "\nx = " << x;

if (x <= -2)
    y = 0;
else if (x <= 0)
    y = x * x - 4;
else if (x <= 2)
    y = x * 2 - 4;
else y = 0;
cout << "\ny = "<< y;


system("pause");
return 0;
}