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#include <iostream>
using namespace std;
 
class Appointment
{
	private:
	string description;
	string date,tm;
 
	public:
	virtual occurs_on(int year,int month,int day);
 
}
class OneTime : Appointment
{
 
 
}
 
class Daily : Appointment
{
 
 
 
}
 
class Weekly : Appointment
{
 
 
 
}
class Monthly : Appointment
{
 
 
}
int main() {
 
 
 
 
	return 0;
}

prog.cpp:11:46: error: ISO C++ forbids declaration of ‘occurs_on’ with no type [-fpermissive]
  virtual occurs_on(int year,int month,int day);
                                              ^
prog.cpp:13:1: error: expected ‘;’ after class definition
 }
 ^
prog.cpp:18:1: error: expected ‘;’ after class definition
 }
 ^
prog.cpp:25:1: error: expected ‘;’ after class definition
 }
 ^
prog.cpp:32:1: error: expected ‘;’ after class definition
 }
 ^
prog.cpp:37:1: error: expected ‘;’ after class definition
 }
 ^

Standard output is empty