单项选择题
已知有以下程序
class Point{
private:
float x,y; //点的坐标
public:
Point(float h,float v);
};
class Line
{
private:
Point p1,p2;
……
};
则哪些Line类的构造函数定义是正确的（ ）
A.
Line(){}
B.
Line(Point xp1, Point xp2):p1(xp1),p2(xp2)
{ }
C.
Line(Point xp1, Point xp2)
{
p1 = xp1;
p2 = xp2;
}
D.
Line(double xp1, double yp1, double xp2, double yp2)
{
p1.x = xp1;
p1.y =yp1;
p2.x = xp2;
p2.y = yp2;
}