A Calucator in C++ (Turkish)

#include <iostream>
#include "conio.h"
using namespace std;
 int main(){
     int birinci, ikinci, islem;
     cout << "Ilk Sayi:" << endl;
     cin >> birinci;
     cout << "Ikinci Sayi:" << endl;
     cin >> ikinci;
     cout << "Bir islem secin " << endl;
     cout << "1= Toplama" << endl;
     cout << "2= Cikarma" << endl;
     cout << "3= Carpma" << endl;
     cout << "4= Bolme" << endl;
     cout << "5= Hepsi" << endl;
     cin >> islem;
     switch(islem){
                   case 1:
     cout << birinci << "+" << ikinci << "=" << birinci + ikinci << endl;
     break;
    case 2:
     cout << birinci << "-" << ikinci << "=" << birinci - ikinci << endl;
      break;
      case 3:
     cout << birinci << "*" << ikinci << "=" << birinci * ikinci << endl;
     break;
     case 4:
      if(ikinci == 0){
       cout << birinci << " sifira bolunemez!" << endl;}
     else{
     cout << birinci << "/" << ikinci << "=" << birinci / ikinci << endl;
     }
     break;
     case 5:
          cout << birinci << "+" << ikinci << "=" << birinci + ikinci << endl;
          cout << birinci << "-" << ikinci << "=" << birinci - ikinci << endl;
          cout << birinci << "*" << ikinci << "=" << birinci * ikinci << endl;
           if(ikinci == 0){
       cout << birinci << " sifira bolunemez!" << endl;}
     else{
     cout << birinci << "/" << ikinci << "=" << birinci / ikinci << endl;
     }
    break;
    default:
         cout << "Yanlis bir islem kodu yazdiniz!" << endl;
         }
     cout << "Kapatmak icin bir tusa basiniz...";
     getch();
 }