I'm confused.. here's the homework;

Note: all of this has to be done in classes.

Part I
Define the class Lock. The data members should be private so that the codes may only be altered via the interface functions.

Part II
Write a program called locktest.cpp which declares a lock-type variable, initializes its secret code to some value, then enters a loop in which it asks the user for a code to dial and states whether the lock is open or not.

This was provided by the teacher:
//
Member Functions (public)
Void setCode(int newCode) //Sets the secret code to newcode
void dialcode(int combo) //Dials combo on the lock
bool isopen() //Returns true if lock is open and false if not.

data(private)
int code //secret code that opens lock
int setting //The code that has been dialed on lock. If setting matches code, the lock is considered open. Otherwise, lock is closed.
//

Can anyone give me hints on where to get started?
thanks in advance.