C++圆的半径，周长，面积

#include <iostream>

using namespace std;

class circle
{
    private :

        double redius,r;

    public:


        double  getredius()//从键盘读入半径值，注意要有返回值
        {
             cin>>redius;
            return redius;

        }
        double getgirth()
        {
            return 3.14*2*redius;
        }
        double getarea()
        {
            return 3.14*redius*redius;
        }

};


int main()
{


    circle abc;//形参，存储半径，周长，面积的值
    cout<<"圆的半径为："<<abc.getredius()<<endl;
    cout<<"圆的周长为："<<abc.getgirth()<<endl;
    cout<<"圆的面积为："<<abc.getarea()<<endl;

    return 0;
}