1.非常对象用什么方式调用常函数（非常函数存在的情况下）2.在Show函数用++radius，为什么getAeas函数值发生变化。

#include <iostream>
using namespace std;

class Circle
{
    private:
        double radius;
        const double PI;
    public:
        Circle(double n):radius(n),PI(3.1415925){
        }        
        void Set(double n){
            radius=n;
        }
        double getArea()const
        {
            return PI*radius*radius;
        }
        void Show();
        void Show()const;
};

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

void Circle::Show()
{
    cout<<getArea()<<"非常成员函数"<<++radius<<endl;
     
}
void Circle::Show ()const
{
    cout<<getArea()<<"常成员函数"<<radius<<endl;
}
int main(int argc, char *argv[]) {
   
    Circle c1(2);
    c1.Show();
    Circle const c2(2);
    c2.Show();
    return 0;
}