Newbie Question: My class

**jimboob** · 06-08-2004

Can someone please correct this for me and tell me what I did wrong? I don't really have such a firm understanding of classes. Any help is appreciated.
TIA

#include <iostream.h>

class Camera
{
public:
Camera();

void PositionCamera(float PositionX, float PositionY, float PositionZ);

private:
float PositionX1;
float PositionY1;
float PositionZ1;
};

void Camera::PositionCamera(float PositionX, float PositionY, float PositionZ)
{
PositionX1 = PositionX;
PositionY1 = PositionY;
PositionZ1 = PositionZ;
}

void main()
{
Camera.PositionCamera(12,16,17);
}

**eth0** · 06-08-2004

you need to instantiate the object.

Code:

int main() {
   Camera camera1;
   camera1.PositionCamera(12,16,17);

   return 0;
}

**jimboob** · 06-08-2004

Nah... Still didn't work...
Got the error

rar.obj : error LNK2001: unresolved external symbol "public: __thiscall Camera::Camera(void)" (??0Camera@@QAE@XZ)
Debug/rar.exe : fatal error LNK1120: 1 unresolved externals

I was thinking that maybe its my Compiler (Visual C++ 6.0). However when it comes to just clicking the 'Compile' button no errors occur, it's only when i click on Build that I have trouble.
Is there any needed library for Classes?

Thanks eth0

**hk_mp5kpdw** · 06-08-2004

Your compiler expects a default constructor to be defined since you specified one should exist as a member of your class:

Code:

Camera::Camera()
{
    // Do stuff here, initialize private members to 0.0 maybe?
}

**jimboob** · 06-08-2004

Yep. It worked.
Thanks hk_mp5kpdw and Eth0.

**eth0** · 06-08-2004

Originally Posted by jimboob

Yep. It worked.
Thanks hk_mp5kpdw and Eth0.

Sorry, I missed the fact that you had declared a constructor in your class.

the error it was pulling up related to that fact. Broken down slightly:

public: Camera::Camera(void) <--this is your constructor
LNK1120: 1 unresolved externals <-- can't find the method

You could of course pull out the constructor decleration from your class.

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