Newbie Question: My class

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);
}

you need to instantiate the object.

Code:

---

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

  return 0;
}

---

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

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?
}

---

Yep. It worked.
Thanks hk_mp5kpdw and Eth0.

Quote:

---

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.