Program POM Bensin Cpp

#include <cstdlib>
#include <iostream>
#include <time.h>
#include <math.h>
#include <iomanip>

using namespace std;

class SPBU{
      private: 
      float rp;
      float ltr;
      int jum;
      float litlit;
      int jum1;
      float bensin,bensin2,bensin3,bensin4;
       
      
      public:
      float menu();
      float liter();
      void rupiah();
      double  ulang();
      void wait (float seconds);
         
         
          };
          
float SPBU::menu(){
     char pil;
cout<<"\b";

     cout<<"\a\t\t+\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5+\n";
     cout<<"\t\t\3                                               \3\n";
     cout<<"\t\t\3 SELAMAT DATANG DI POM BENSIN PASTI PAS BANGET \3\n";
     cout<<"\t\t\3                                               \3\n";
     cout<<"\t\t+\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\3\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5\5+\n";
     cout << "\t\t      +-----------------------------------+" << endl; 
     cout << "\t\t      |                MENU               |" << endl; 
     cout << "\t\t      +-----------------------------------+" << endl << endl;    
     cout<<"\t\t\t\tSilahkan Pilih: \n";
          cout<<"\t\t\t\t1. Rupiah"<<endl;
          cout<<"\t\t\t\t2. Liter"<<endl;
          cout<<"\t\t\t\t3. Exit"<<endl;   
          cout<<"\t\t\t\t=================="<<endl;  
     cout<<"\t\t\t\tMasukkan Pilihan: ";cin>>pil;
     pil=toupper(pil);
     while(!((pil=='1')||(pil=='2')||(pil=='3'))){
     cout<<"Pilian SALAH\nPilihan diluar jangkauan..!\nPilih nomor 1-3\n";
     cout<<"Pilih salah satu:";cin>>pil;
     pil=toupper(pil);
     }
     switch(pil){
         case '1': rupiah(); break;
         case '2': liter(); break;
         case '3': cout<<"Terima Kasih\n"; system("exit"); break;          
         default: cout<<"Terimakasih"<<endl;        
               
                 }
    
     }
float SPBU::liter(){
system("CLS");
    cout << "\a\t\t\t+-----------------------------------+" << endl; 
    cout << "\t\t\t|           PILIHAN LITER           |" << endl; 
    cout << "\t\t\t+-----------------------------------+" << endl << endl;
     bensin=4500;
     bensin3=1;
     bensin4=bensin3/bensin;     
     cout<<"Liter: ";cin>>ltr;
     jum1=ltr*4500;
     cout<<"Harga: "<<jum1;

     for (int n=0; n<=jum1; n++) {
           cout <<system("CLS") ;
          cout<<"\b"<<"Beli : Rp."<<jum1<<"\nHarga: Rp."<<n<<endl;
          bensin2=bensin4*n;
          cout<<"Liter: "<<setprecision(3)<<fixed<<bensin2<<endl;
          wait (0.001);
        if(n==jum1){goto step1;}  
                   }
                   step1:
                         cout<<"\n=================\n";
                   cout<<"\a\aHarga: Rp."<<jum1<<endl;
                   cout<<"Liter: "<<ltr<<" Liter"<<endl;
    ulang();
     }

void SPBU::rupiah(){
     system("CLS");
     cout << "\a\t\t\t+-----------------------------------+" << endl; 
     cout << "\t\t\t|           PILIHAN RUPIAH          |" << endl; 
     cout << "\t\t\t+-----------------------------------+" << endl << endl;
     bensin=4500;
     bensin3=1;
     bensin4=bensin3/bensin;     
     cout<<"Rupiah: ";cin>>rp;
     litlit=rp/4500;
     jum=litlit*4500;
     cout<<"Liter: "<<jum;

     for (int n=0; n<=jum; n++) {
         
         cout <<system("CLS") ;
         
          cout<<"\b"<<"Harga: "<<n<<"\nBeli : Rp."<<jum<<endl;
          bensin2=bensin4*n;
          cout<<"Liter: "<<setprecision(3)<<fixed<<bensin2<<endl;

          wait (0.001);
        if(n==jum){goto step1;}  
                   }
                   step1:
                   cout<<"\n=================\n";
                   cout<<"\a\aHarga: Rp. "<<int(rp)<<endl;
                   cout<<"Liter: "<<bensin2<<" Liter"<<endl;
    ulang();
}

double SPBU::ulang(){
    char aa;
     cout<<"\n\n\nApakah anda ingin mengulang ? (y/n) : ";cin>>aa;
    aa=toupper(aa);
    while(!((aa=='Y')||(aa=='y')||(aa=='n')||(aa=='N'))){
    cout<<"\aPilihan tidak tersedia, ulangi, Pilih (Y)es/(N)o "<<endl;
    cout<<"\ahitung lagi/keluar?<Y/N> ";cin>>aa;
    aa=toupper(aa);}
    switch(aa){
    case 'Y': system("cls");return menu(); break;
    
    case 'N':  cout << "\a\a\a\a\t\t\t+-----------------------------------+" << endl; 
                      cout << "\t\t\t|  TERIMAKASIH  ATAS KUNJUNGAN ANDA |" << endl; 
                      cout << "\t\t\t+-----------------------------------+" << endl ;
                         cout<<"\t\t\t Kepuasan anda adalah kebahagian kami\n";
                      cout<<" \t\t\t     \1  \1  \1  \1  \1  \1  \1  \1  \1  \1\n\n" << endl; 
        
        
               system("PAUSE");return  EXIT_SUCCESS;break;
               }
    
    }     
     
 void SPBU::wait ( float seconds ){
  clock_t endwait;
  endwait = clock () + seconds * CLOCKS_PER_SEC ;
  while (clock() < endwait) {}
} 

int main()
{
    system("title SPBU PASTI PAS");
    float b=1/2;
    
    cout<<b;
    SPBU x;
    x.menu();
  
}

Thanks for reading & sharing Agus Nur Ikhsan