Thread: Class questions!

I just have a couple questions concerning classes.

1. Can you have multiple classes in one file? as in #ifndef...#endif then another #ifndef...

2. does the file name have to be the same as the class name? aka circle.h and the file has to be circle?

3. Do classes only handle data? Can the member functions cout stuff to the screen and get input?

4.What exactly does a constructor do? Like lets say you want to house a constructor for a house, would you have to set all the variables there to zero

Code:

public:
house();

private:
float doors, windows, rooms;

house::house()
{
doors=0;
windows=0;
rooms=0;
}

5. Can someone please explain to me what this "copy constructor" does because I have no clue on that

Code:

public:
          circle();
          circle(const circle &);<-copy constructor
private:
          ....

circle::circle(const circle & Object)<-Dont know what object exactly does
{
radius=object.radius;
}

Tell me if you need the entire coding for the copy constructor but yea thanks for reading all my questions