对重载输出符不了解
#include <iostream.h>class point { int x; int y; public: point(int xx=0,int yy=0):x(xx),y(yy){}; void setvalue(); friend ostream& operator<< (ostream& os,const piont& obj);};void point::setvalue (){ cout<<"please enter the value!"<<endl; cin>>x>>y;}ostream& operator<< (ostream& os,const point& obj){ os<<obj.x<<" "<<obj.y; return os;}void main(){ point p1； p1.setvalue (); cout<<p1;}#include <iostream> using namespace std;class point { int x; int y; public: point(int xx=0,int yy=0):x(xx),y(yy){}; void setvalue(); friend ostream& operator<< (ostream& os, const point& obj); //point, not piont!!!}; void point::setvalue (){ cout<<"please enter the value!"<<endl; cin>>x>>y; } ostream& operator<< (ostream& os,const point& obj){ os<<obj.x<<" "<<obj.y; return os; } int main(){ point p1; p1.setvalue (); cout<<p1; return 0;}