clrscr();
   cout<<"please enter number 1 :";
   cin>>num1;
   cout<<"please enter operator :";
   cin>>op;
   cout<<"please enter number 2 :";
   cin>>num2;
   switch (op)

   {
   case "+" : cout<<"sum="<  

   case "-" : cout<<"mines="<

   case "*" : cout<<"zarb="<

   case "/" : cout<<"divide=3"<

   default :  cout<<"wrong operator"; getch();  break;

   }

  }
  //heram
  case "h" :
  {
   clrscr();
   cout<<"\t"<<"       *"<<"\n"<<"       *"<<" *"<<"\n"<<"      *"<<"*"<<" *"<<"*"<<"\n"<<"     *"<<"*"<<"*"<<" *"<<"*"<<"*"<<"\n"<<"    *"<<"*"<<"*"<<"*"<<" *"<<"*"<<"*"<<"*";
   getch();
   break;
  }
  //numbers between 200|1
  case "n" :
  {
   clrscr();
   for(int i=1;i<=200;i++)
   cout<   cout<<"\n";
   for( i=200;i>=1;i--)
   cout<   getch();
   break;
  }
  //quit of program
  case "e" :
  {
   return 0;
   break;
  }
  //no choise
  default:
   continue;

  } //end of main menu
 } //end of while
}  //end of program