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

using namespace std;

int main() {
    int opt = 0;
    system("CLS");
    cout<<"############################\n";
    cout<<"Nama : Robby Prima S\n";
    cout<<"Nama : 17120031 S\n";
    cout<<"Nama : 17.1B.33\n";
    cout<<"############################\n";
    cout<<"1. Hitung Luas Segitiga.\n";
    cout<<"2. Hitung Luas Lingkaran.\n";
    cout<<"############################\n";
    cout<<"Pilihan (1, 2): ";cin>>opt;

    if (opt == 1) {
       int result = 0;
       int alas = 0, tinggi = 0;

       cout<<"Masukan Alas : ";cin>>alas;
       cout<<"Masukan Tinggi : ";cin>>tinggi;

       result = (alas*tinggi)/2;

       cout<<"\nLuas Segitiga : "<<result;
       cout<<endl;

       char ans;

       cout<<"Ulangi ? (Y/n) : ";cin>>ans;

       if ((ans == 'Y') || (ans == 'y')) {
          return main();
       }

       else {
            cout<<"Bye!!";
            getch();
       }
    }

    else if (opt == 2) {
        float vi = 3.14;
        int r;
        float result = 0;

        cout<<"Masukan Jari-jari : ";cin>>r;

        result = vi*(r^2);

        cout<<"\nLuas Lingkaran : 3.14 (r^2) = "<<result;
        cout<<endl;

        char ans;

        cout<<"Ulangi ? (Y/n) : ";cin>>ans;

        if ((ans == 'Y') || (ans == 'y')) {
            return main();
        }

        else {
            cout<<"Bye!!";
            getch();
        }
    }

    else {
         char ans;

         cout<<"\n\nMenu Salah! \nUlangi ? Y/n : ";cin>>ans;

         if ((ans == 'Y') || (ans == 'y')) {
            return main();
         }

         else {
            cout<<"Bye!!";
            getch();
         }
    }

}