Class Troubles

**Aliaks** · 06-12-2009

Hey I have been just trialing some classes to use within a game for an assignment and it is coming up with a error in source.cpp line 137 and later.

It says somethign about it not being a part for the class () () and I have jumbled stuff around and followed some books but still no luck...

was just wondering if anyone can spot the problem.

I uploaded both problems and the call functions are commented out .

Espeon.Meow()
Ruffles.Woof()
Eskia.Screech()

**laserlight** · 06-12-2009

The problem is that these lines declare functions, not objects:

Code:

Cat Espeon();

Dog Ruffles();

Eagle Eskia();

You should have written:

Code:

Cat Espeon;

Dog Ruffles;

Eagle Eskia;

Oh, and avoid global variables and do not write such long functions.

**Aliaks** · 06-12-2009

Ahhh thanks kindly

Not sure how to shorten certain functions but Ill try.

**Aliaks** · 06-12-2009

I did that and it had a compile error,

undefined reference of Class::Cat()

**laserlight** · 06-12-2009

In other words, you declared the default constructor but did not define it (or maybe you declared some other constructor but did not also define the default constructor).

**Aliaks** · 06-12-2009

Code:

class Cat                                                          // Begins declaration of class
{                                                                  //
    public:                                                        // Begins public section
        Cat();                                                     //
        ~Cat();                                                    //
        void Meow()
        {cout << "Meow! \n";}                                      // General functions and so fourth
        void Info();
    private:

};

That is my class header code for just the cat to start with.

Code:

Cat Espeon;

    switch(petChoice)   // Depends on the pet of the player, displays a different pet introduction.
{
        case 1:

        Espeon.Meow();
        cout << "Espeon slips into the stable, rubs up against your horses leg and jumps into you saddle pack.\n\n";
        Espeon.Meow();
        break;

and that is basicly the code for the cat in the source code

**laserlight** · 06-12-2009

Right, so where did you define (implement) Cat()?

**Aliaks** · 06-12-2009

You mean where I defined the cat Espeon? (sorry im new to terminology and c ++)
if so, at the top. The rest is in the header file

**laserlight** · 06-12-2009

Originally Posted by Aliaks

You mean where I defined the cat Espeon?

No, I mean the place where you implemented the default constructor that you declared for the Cat class. Presumably this was in a source file.

**Aliaks** · 06-12-2009

from my knowledge i defined it in the header file under the cat() which was ~cat() but as im not 100% sure of how it works yet I probably did ity wrong

**laserlight** · 06-12-2009

Originally Posted by Aliaks

from my knowledge i defined it in the header file under the cat() which was ~cat()

~Cat() declares the destructor.

**Aliaks** · 06-12-2009

yeah I have that in the header

**laserlight** · 06-12-2009

Okay, it sounds like you are not getting it at all. Change your class definition to:

Code:

class Cat
{
public:
    Cat() {}

    void Meow()
    {
        cout << "Meow! \n";
    }

    void Info() {}
private:

};

Do you still get that error? Can you see that I defined the default constructor whereas you only declared it?

**Aliaks** · 06-12-2009

Ahhh yep I see now

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