circle.cpp

dll的一些学习资料

// circul.cpp: implementation of the circul class.
//
//////////////////////////////////////////////////////////////////////
#ifndef DLL_FILE
#define DLL_FILE
#endif
 
#include "circle.h"
#define PI 3.1415926
circle::circle ()
{
   centre = point(0,0);
   radius = 0;
}
float circle::GetArea()
{
	return PI*radius*radius;
}
float circle::GetGirth()
{
    return 2*PI*radius;
}
void circle::SetCentre(const point &centrePoint)
{
	centre = centrePoint;
}
void circle::SetRadius(float r)
{
	radius = r;
}