有如下程序:#includeiostream#includecmathusing 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){}//①private:int x,y;};double distance(const Point p){ //②return sqrt(P.x*P.x+P.y*P.y);}int main(){Point p1(3,4);coutdistance(p1);return 0; //③}下列叙述中正确的是A.程序编译正确B.程序编译时语句①出错C.程序编译时语句②出错D.程序编译时语句③出错
有如下程序:
#include<iostream>
#include<cmath>
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<<distance(p1);
return 0; //③
}
下列叙述中正确的是
A.程序编译正确
B.程序编译时语句①出错
C.程序编译时语句②出错
D.程序编译时语句③出错
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