#include <iostream>
#include <math.h>
#include <cmath>
#include <iomanip>

using namespace std;

double Func(double x) {
    if (x <= 0) {
        return abs(x);
    } else if (0 < x && x < 4) {
        return sqrt(x);
    } else {
        return 2;
    }
}

int main() {
    double x, y;
    cout << "Function value table" << endl;
    for (int i = 0; i < 21; i++) {
        cout << "_";
    }
    cout << endl;
    cout << ("| X\t |\t Y |\n");
    for (int i = 0; i < 21; i++) {
        cout << "_";
    }
    cout << endl;
    for (double i = -2; i <= 8; i += 0.5) {
        x = i * 0.25;
        y = Func(x);
        cout << "| " << (x >= 0 ? " " : "");
        cout << fixed << setprecision(4);
        cout << x;
        cout << " | ";
        cout << (y >= 0 ? " " : "");
        cout << fixed;
        cout << setprecision(4);
        cout << y << " |" << endl;
    }
    for (int i = 0; i < 21; i++) {
        cout << "_";
    }
    cout << endl;
    return 0;
}