Exercise switch ..case

#include<iostream.h>
main ()
{
     int selection,quantity;
     double price;
 
     cout<<"\n 1. Pen    =RM 0.50";
     cout<<"\n 2. Pensil =RM 0.30";
     cout<<"\n 3. Ruler  =RM 0.20";
     cout<<"\n 4. Erser  =RM 0.10"<<endl;
 
     cout<<"\n Enter your selection= ";
     cin>>selection;
     cout<<"\n Enter your quantity= ";
     cin>>quantity;

switch (selection)
{
     case 1:
price = quantity * 0.50;
cout<<"\n Price = RM "<<price<<endl;
cout<<"\n Your selection is Pen with "<<quantity;
cout<<" ,as your quantity(s)"<<endl;
break;
  
case 2:
price = quantity * 0.30;
cout<<"\n Price = RM "<<price<<endl;
cout<<"\n Your selection is Pensil with "<<quantity;
cout<<" ,as your quantity(s)"<<endl;
break;

     case 3:
price = quantity * 0.20;
cout<<"\n Price = RM  "<<price<<endl;
cout<<"\n Your selection is Ruler with "<<quantity;
cout<<" ,as your quantity(s)"<<endl;
break;
  
case 4:
price = quantity * 0.10;
cout<<"\n Price = RM  "<<price<<endl;
cout<<"\n Your selection is Erser with "<<quantity;
cout<<" ,as your quantity(s)"<<endl;
break;

default:
cout<<"\n Invalid selection"<<endl;
}

return 0;
}