3）error C2512: 'Coordinate' : no appropriate default constructor available

error C2664: '__thiscall Coordinate::Coordinate(class Coordinate &)' : cannot convert parameter 1 from 'const int' to 'class Coordinate &'

A reference that is not to 'const' cannot be bound to a non-lvalue

修改：

#include <iostream>

using namespace std;

class Coordinate

{

public:

Coordinate(int x1, int y1){x=x1; y=y1;} Coordinate(Coordinate &p);

Coordinate（）；

Coordinate（int i）；

~Coordinate(){cout<<"Destructor is called."<<endl;} int getx(){return x;} int gety(){return y;}

private:

};

Coordinate::Coordinate(Coordinate &p){

}

int main(){

Coordinate p1(3,4); Coordinate p2(p1); x=p.x; y=p.y; cout<<"Copy initianization constructor is called."<<endl; int x, y;

Coordinate p5（2）；

Coordinate p3=p2; cout<<"p3=("<<p3.getx()<<","<<p3.gety()<<")"<<endl;

return 0;}