设计实现一个CPoint类，满足以下要求：

#include<iostream>
using namespace std;
class CPoint{
    private://可以省略
    int x,y;
    public:
    CPoint(int a=0,int b=0)
    {
        x=a;
        y=b;
    }
    istream& operator>>(istream& stream,CPoint &a){
        stream>>a.x>>a.y;
    }
    void print(){
    cout<<x<<""<<y<<endl;
    }
    CPoint(/*const*/ CPoint& c){
    x=c.x;
    y=c.y;
    }   
};
int main(){
    CPoint a(100,100);
    a.print();
    CPoint b;
    cin>>b;
    b.print();
    CPoint c(a);
    c.print();
    return 0;
}