Question

C++提示error C2664: 'len' : cannot convert parameter 1 from 'class point' to 'class point *'

#include <iostream>
#include <cmath>
using namespace std;
class point
{
private: int x;int y;
public:
point(int x=0,int y=0):x(x),y(x){}
void input(int xx=0,int yy=0){
x=xx;y=yy;}
int getX(){return x;}
int getY(){return y;}
point(const point &p){x=p.x;y=p.y;}
friend class quad;
};
class quad
{
private:
public:

point p[4];
float len(point *p1,point *p2,point *p3,point *p4 );

};

float quad::len(point *p1,point *p2,point *p3,point *p4)
{float len=0;
len+=sqrt(((*p1).getX()-(*p2).getX())*((*p1).getX()-(*p2).getX())+((*p1).getY()-(*p2).getY())*((*p1).getY()-(*p2).getY()));
len+=sqrt(((*p2).getX()-(*p3).getX())*((*p2).getX()-(*p3).getX())+((*p2).getY()-(*p3).getY())*((*p2).getY()-(*p3).getY()));
len+=sqrt(((*p3).getX()-(*p4).getX())*((*p3).getX()-(*p4).getX())+((*p3).getY()-(*p4).getY())*((*p3).getY()-(*p4).getY()));
len+=sqrt(((*p4).getX()-(*p1).getX())*((*p4).getX()-(*p1).getX())+((*p4).getY()-(*p1).getY())*((*p4).getY()-(*p1).getY()));
return len;
}
void main()
{ int x,y;
point p[4];quad q;
cout<<"Please enter a (x,y) into the first coordinates:";
cin>>x>>y;
p[0].input(x,y);
cout<<"Please enter a (x,y) into the second coordinates:";
cin>>x>>y;
p[1].input(x,y);
cout<<"Please enter a (x,y) into the third coordinates:";
cin>>x>>y;
p[2].input(x,y);
cout<<"Please enter a (x,y) into the forth coordinates:";
cin>>x>>y;
p[3].input(x,y);
cout<<"The quadrilateral's perimeter is: "<<q.len(p[0],p[1],p[2],p[3])<<endl;

}
复制构造函数怎么改才对？

Answer 1

你的错误跟复制构造函数没关系，应该填point*类型的参数，填了point而已