3-0-8答.txt

来自「思路很清晰的c++课件。例子很简明」· 文本 代码 · 共 20 行

#include <iostream.h>

const double PI=3.1415926;

class Circle{
private:
	double r;
public:
	Circle(double r0):r(r0){}
	double zhouchang(){return 2*PI*r;}
	double mianji(){return PI*r*r;}
};
void main()
{
	Circle x(10),y(5);
	cout<<"x的周长="<<x.zhouchang()<<",面积="<<x.mianji()<<endl;
	cout<<"y的周长="<<y.zhouchang()<<",面积="<<y.mianji()<<endl;

}