ms vc++ header file problem

my header file wont compile..it is saying something is with the the function volume..."Box.obj : error LNK2005: "public: double __thiscall CBox::Volume(void)const " (?Volume@CBox@@QBENXZ) already defined in Ex9_08.obj
Debug/Ex9_08.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe."

here is the code

Code:

---

// Box.h: interface for the CBox class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_BOX_H__FC3564E5_37CD_11D7_AB37_00A0CC585627__INCLUDED_)
#define AFX_BOX_H__FC3564E5_37CD_11D7_AB37_00A0CC585627__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class CBox 
{
public:
        double GetHeight() const { return m_Height; }
        double GetBreadth() const { return m_Breadth; }
        double GetLength() const { return m_Length; }
        double Volume() const;

        CBox(double lv = 1.0, double bv = 1.0, double hv = 1.0);
        virtual ~CBox();

private:
        double m_Height;
        double m_Breadth;
        double m_Length;
};

double CBox::Volume() const
{
        return m_Breadth*m_Height*m_Length;
}

#endif // !defined(AFX_BOX_H__FC3564E5_37CD_11D7_AB37_00A0CC585627__INCLUDED_)

---

help is appreciated....

I see you are writing functions in your header file. CBox::Volume() should go into a cpp file.

Usually you don´t compile header-files. They only serve as a interface (for the users of your´s lib).

so i am not suppose to write any functions in the header file...just only the declarations....then what about inline functions...do i write that in the body of class definition?

Inlines stay in the header, but inside the class declaration.