Calculator sederhana

/*
    Create By   : Kadoel Noesa
    Test On     : Borland C++
*/

#include <iostream>
#include <conio>

main()
{
   int a,b,hasil,sisa;
   char ulang,pilih;
   menu:
   clrscr();
   cout<<"===========================\n";
   cout<<"    Calculator Sederhana \n";
   cout<<"===========================\n";
   cout<<"[1].  Penjumlahan \n";
   cout<<"[2].  Pengurangan \n";
   cout<<"[3].  Perkalian \n";
   cout<<"[4].  Pembagian \n";
   cout<<"===========================\n\n";
   cout<<"Masukkan Pilihan Anda : "; cin>>pilih;

    if (pilih=='1') {
    clrscr();
    cout<<"===========================\n";
    cout<<"   Calculator Penjumlahan  \n";
    cout<<"===========================\n";
    cout<<"Masukkan Bilangan Pertama    : "; cin>>a;
    cout<<"Masukkan Bilangan Kedua      : "; cin>>b;
    hasil = a+b;
    cout<<"Hasil Penjumlahan " <<a<<" dengan "<<b<< " = "<<hasil<<endl;
    cout<<"===========================\n\n";
    }

    else if (pilih=='2') {
    clrscr();
    cout<<"===========================\n";
    cout<<"   Calculator Pengurangan  \n";
    cout<<"===========================\n";
    cout<<"Masukkan Bilangan Pertama    : "; cin>>a;
    cout<<"Masukkan Bilangan Kedua      : "; cin>>b;
    hasil = a-b;
    cout<<"Hasil Pengurangan " <<a<<" dengan "<<b<< " = "<<hasil<<endl;
    cout<<"===========================\n\n";
    }

    else if (pilih=='3') {
    clrscr();
    cout<<"===========================\n";
    cout<<"    Calculator Perkalian    \n";
    cout<<"===========================\n";
    cout<<"Masukkan Bilangan Pertama    : "; cin>>a;
    cout<<"Masukkan Bilangan Kedua      : "; cin>>b;
    hasil = a*b;
    cout<<"Hasil Perkalian " <<a<<" dengan "<<b<< " = "<<hasil<<endl;
    cout<<"===========================\n\n";
    }

    else if (pilih=='4') {
    clrscr();
    cout<<"===========================\n";
    cout<<"    Calculator Pembagian   \n";
    cout<<"===========================\n";
    cout<<"Masukkan Bilangan Pertama    : "; cin>>a;
    cout<<"Masukkan Bilangan Kedua      : "; cin>>b;
    hasil = a/b;
    sisa = a%b;
    cout<<"Hasil Pembagian " <<a<<" dengan "<<b<< " = "<<hasil<<endl;
    cout<<"Dan Sisa Baginya                         = "<<sisa<<endl;
    cout<<"===========================\n\n";
    }

    else {
    goto menu;
    }

    ul:
    cout<<"Apakah Anda Ingin Mencoba Lagi [Y/N] : "; cin>>ulang;

    if (ulang =='y' || ulang=='Y'){
    goto menu;
    }

    else if (ulang=='n' || ulang=='N'){
    clrscr();
    cout<<"TERIMAKASIH";
    }

    else {
    clrscr();
    goto ul;
    }


getch();
}