#include <iostream>
#include <conio.h>
#include <ctime>

using namespace std;

double kwadrat (int a)
{
    return a * a;
}

double prostokat(int a, int b)
{
    return a * b;
}

double trojkat(int a, int h)
{
    return 0.5 * a * h;
}

double trapez(int a, int b, int h)
{
    return 0.5 * (a + b) * h;
}

double rlegbok(int a, int h)
{
    return a * h;
}
double romb1(int a, int h)
{
    return a * h;
}
double romb2(int e, int f)
{
    return 0.5 * e * f;
}



main() {
    bootstrap();
    return 0;
}

void bootstrap() {
    int figura;
    cout << ">>>>>>     PROGRAM DO OBLICZANIA POL FIGUR GEOMETRYCZNYCH     <<<<<<" << endl;
    cout << "_______________________________________________________________________\n" << endl;
    cout << "Wybierz figure ktorej pole chcesz obliczyc" << endl;
    cout << "1 - kwadrat" << endl;
    cout << "2 - prostokat" << endl;
    cout << "3 - trojkat" << endl;
    cout << "4 - trapez" << endl;
    cout << "5 - rownoleglobok" << endl;
    cout << "6 - romb (podstawa i wysokosc)" << endl;
    cout << "7 - romb (przekatna)" << endl;
    cout << "8 - wyjscie z programu" << endl;
    cin >> figura;

    switch (figura) {
        case 1:
            int a;

            cout << "Podaj bok a kwadrata" << endl;
            cin >>a;
            cout << "Pole trojkata to: " <<kwadrat(a) << endl;
            undo();
            break;
        case 2:
            int b;

            cout << "Podaj bok a prostokata" << endl;
            cin >> a;
            cout << "Podaj bok b prostokata" << endl;
            cin >> b;
            cout << "Pole prostokata to: " << prostokat(a, b) << endl;
            undo();
            break;
        case 3:
            int h;

            cout << "Podaj bok a trojkata" << endl;
            cin >> a;
            cout << "Podaj wysokosc h trojkata" << endl;
            cin >> h;
            cout << "Pole trojkata to: " << trojkat(a, h) << endl;
            undo();
            break;
        case 4:
            cout << "Podaj bok a trapezu" << endl;
            cin >> a;
            cout << "Podaj bok b trapezu" << endl;
            cin >> b;
            cout << "Podaj wysokosc h trapezu" << endl;
            cin >> h;
            cout << "Pole trapezu to: " << trapez(a, b, h) << endl;
            undo();
            break;
        case 5:
            cout << "Podaj bok a rownolegloboku" << endl;
            cin >> a;
            cout << "Podaj wysokosc h rownolegloboku" << endl;
            cin >> h;
            cout << "Pole rownolegloboku to: " << rlegbok(a, h) << endl;
            undo();
            break;
        case 6:
            cout << "Podaj bok a rombu" << endl;
            cin >> a;
            cout << "Podaj wysokosc h rombu" << endl;
            cin >> h;
            cout << "Pole rombu to: " << romb1(a, h) << endl;
            undo();
            break;
         case 7:
            int e, f;

            cout << "Podaj przekatna e rombu" << endl;
            cin >> e;
            cout << "Podaj przekatna f rombu" << endl;
            cin >> f;
            cout << "Pole rombu to: " << romb2(e, f) << endl;
            undo();
            break;
        case 8:
            exit(0);
            break;
    }

}

void undo() {
    int cofamichuj;
    cout << "Wybierz 9 aby cofnac" << endl;
    cin >> cofamichuj;

    switch (cofamichuj) {
        case 9:
            bootstrap();
            break;
    }
}