C++：类的对象成员示例

//DefineClass.h

#pragma once


//定义平面上的一个点类
class Point
{
public:
	Point(double a, double b);		//构造函数
	double GetX();
	double GetY();
private:
	double m_x, m_y;
};
//定义圆类
class Circle
{
public:
	Circle(double cx, double cy, double cr);		//构造函数
	void DisplayCircleInfo();

private:
	Point m_center;			//对象成员
	double m_radius;		//非对象成员
};

#include "stdafx.h"						//要放在最前面，否则报错
#include "DefineClass.h"
#include 
using namespace std;
Point::Point(double a, double b)		//构造函数
{
	m_x = a;
	m_y = b;
}
double Point::GetX()
{
	return m_x;

}
double Point::GetY()
{
	return m_y;
}

Circle::Circle(double cx, double cy, double cr)
	:m_center(cx,cy)					//构造函数
{
	m_radius = cr;
}
void Circle::DisplayCircleInfo()
{
	cout << "圆心为：" << m_center.GetX()
		<< "," << m_center.GetY() << endl;
	cout << "半径为：" << m_radius << endl;
}

// Lei_duixiang.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "DefineClass.h"
#include 
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
	Circle cicle(2.3, 4.6, 10.1);
	cicle.DisplayCircleInfo();


	getchar();
	return 0;
}

运行结果：