3.22和3.23

最新推荐文章于 2020-06-04 14:35:14 发布

原创最新推荐文章于 2020-06-04 14:35:14 发布 · 481 阅读

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3.22

#include<iostream>
using namespace std;
const double PI=3.14;
class Circle{
public:
	Circle(int r)
	{radius=r;}
	double area()
	{
		return(PI*radius*radius);
	}
private:
	int radius;
};
	int main()
	{
		Circle r1(10);
		r1.area();
		cout<<"the Circle's area is"<<r1.area()<<endl;
		return 0;
	}

3.23

#include<iostream>
using namespace std;
const double PI=3.14;
class cylinder{
public:
cylinder(double r,double h)
{
	radius=r;
	high=h;
}
double v()
{return(PI*radius*radius*high);}
void vol()
{cout<<"the cylinder's v is"<<'\t'<<v()<<endl;}
private:
	double radius;
	double high;
};
int main()
{
	cylinder v1(4.2,5.5);
	v1.v();
	v1.vol();
	cylinder v2(3,6);
	v2.v();
	v2.vol();
	return 0;
}