#include <iostream>
#include <math.h>
using namespace std;
int z; int y; int r;
const double pi=3.14;
int main()
{
    system ("color 5");//kolor tekstu
    //----------------------------------------------\\
    //--------------------MENU----------------------\\
    //----------------------------------------------\\
    cout<<"                 MENU"<<endl;
    cout<<"             1 - Kolo"<<endl;
    cout<<"             2 - Prostokat"<<endl;
    cout<<"             3 - Rownoleglobok"<<endl;
    cout<<"             4 - Trapez"<<endl;
    cout<<"             5 - Konwenter"<<endl;
    cout<<"             6 - Kalkulator"<<endl;
    cout<<"             7 - Trojkat"<<endl;
    cout<<"             8 - Wyjscie"<<endl;
    cin>>z;
    //----------------------------------------------\\
    //-----------------WYBÓR Z MENU-----------------\\
    //----------------------------------------------\\
    switch (z)
    {
           case 1: /*kolo*/
           {
                system ("color 4");
                cout<<"            Kolo"<<endl;
                cout<<"        1 - Pole"<<endl;
                cout<<"        2 - Obwod"<<endl;
                cout<<"        3 - Wyjscie"<<endl;
                cin>>y;
                if (y=1)
                {
                     cout<<"Wybrano 'Pole'. Podaj promien kola"<<endl;
                     cin>>r;
                     cout<<"Pole kola o promieniu "<<r<<" wynosi "<< pi*r*r<<endl;
                }
           }
           default:
                   {
                                 cout<<"lol"<<endl;
                   }
    }

    system ("pause");
}