DLLGeo Header files

//This are the DLLGeo Header files
//CubeGeometricCalc.h
#ifndef __CUBEGEOMETRICCALC_H__
#define __CUBEGEOMETRICCALC_H__

#include "IGeometricCalc.h"

class CubeGeometricCalc :public IGeometricCalc {
private:
    float m_Side;
    float m_Height;
    float m_Radius;
    float m_SurfaceArea;
    float m_Volume;

public:
    void SetGeometricAttributes(float inSide1, float inSide2, float inRadius);
    float CalculateSurfaceArea();
    float CalculateVolume();
};

#endif
------------------------------------------------
//CylinderGeometricCalc.h
#ifndef __CYLINDERGEOMETRICCALC_H__
#define __CYLINDERGEOMETRICCALC_H__

#include "IGeometricCalc.h"

class CylinderGeometricCalc :public IGeometricCalc {
private:
    float m_Side;
    float m_Height;
    float m_Radius;
    float m_SurfaceArea;
    float m_Volume;

public:
    void SetGeometricAttributes(float inSide1, float inSide2, float inRadius);
    float CalculateSurfaceArea();
    float CalculateVolume();

};

#endif
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//DLLGeo.h
#ifndef __DLLTEST_H__
#define __DLLTEST_H__

#ifdef DLL_EXPORT
#define DLLTEST_API __declspec (dllexport)
#else
#define DLLTEST_API __declspec (dllimport)
#endif

#include "IGeometricCalc.h"


extern "C"
{
    DLLTEST_API IGeometricCalc* NewObject(int operation);
    DLLTEST_API void DelObject(IGeometricCalc *pObject);
}

#endif
---------------------------------
//IGeometricCalc.h
#ifndef __IGEOMETRICCALC_H__
#define __IGEOMETRICCALC_H__

#define PI 3.142

class IGeometricCalc
{
public:
    virtual void SetGeometricAttributes(float inSide1, float inSide2, float inRadius) = 0;

    virtual float CalculateSurfaceArea() = 0;
    virtual float CalculateVolume() = 0;

};
#endif
---------------------------------------
//SphereGeometricCalc.h
#ifndef __SPHEREGEOMETRICCALC_H__
#define __SPHEREGEOMETRICCALC_H__

#include "IGeometricCalc.h"
#define PI 3.142

class SphereGeometricCalc : public IGeometricCalc
{
private:
    float m_Side;
    float m_Height;
    float m_Radius;
    float m_SurfaceArea;
    float m_Volume;

public:
    void SetGeometricAttributes(float inSide1, float inSide2, float inRadius);
    float CalculateSurfaceArea();
    float CalculateVolume();

};

#endif