Thread: how to loop in switch??

how im gonna loop menu if option not 1 or 2 ???

Code:

void display( )
{  
	int option;
	system("cls"); //clear screen
	cout<<endl<<endl;
	cout<<"\t  * Display Menu *\n";
	cout<<"\n\t1. Display For Certein Date"<<endl; 
	cout<<"\t2. Display All Appointments"<<endl;
	cout<<"\nEnter Option Number: ";  //Enter option
	cin>>option;
	cin.get();

	switch ( option ) 
	  {
		 case 1: displayCerteinDate ( );
			     break;
		 case 2: displayAll ( );
		             break;
	     default: cout<<endl<<"Wrong option number!! Try again\n";
	              cin.get();         //give the user a chance to read the output data
	  }
}