swimpool.cpp

在进行Ｃ＋＋培训时

#include<iostream>
using namespace std;
const double PI=3.14;
const double Fence_Price=35;
const double Concrete_Price=20;

class Circle
{
public:
	Circle(double ri)
	{
		ridius=ri;
	}
	double Circumference()
	{
		return 2*PI*ridius;
	}
	double area()
	{
		return PI*ridius*ridius;
	}
private:
	double ridius;
};
void main()
{
	double r;
	cout<<"please enter the ridius of the swimingpool";
	cin>>r;
	Circle swimpool(r);
	Circle Fence(r+3);
	cout<<"the total price for Concrete is:"<<(Fence.area()-swimpool.area())*Concrete_Price<<endl;
	cout<<"the total price for Fence is:"<<Fence.Circumference()*Fence_Price<<endl;
}