#include
#include
using std::cout;
class Point{
public:
friend double distance(const Point &p); //P距原点的距离
Point(int xx=0,int yy=0):x(xx),Y(YY){}//①
private:
int x,y;
};
double distance(const Point &p){ //②
return sqrt(P.x*P.x+P.y*P.y);
}
int main(){
Point p1(3,4);
cout正确答案:A
#include
#include
using std::cout;
class Point{
public:
friend double distance(const Point &p); //P距原点的距离
Point(int xx=0,int yy=0):x(xx),Y(YY){}//①
private:
int x,y;
};
double distance(const Point &p){ //②
return sqrt(P.x*P.x+P.y*P.y);
}
int main(){
Point p1(3,4);
cout正确答案:A