sicily 7614. the Segment class

Description

Design a class named Point to represent a point in the plane, and a class named Segment to represent a segment.
Using the class interface as follows

class Point
{
public:
  Point(double x, double y);
  void setX(double x);
  void setY(double y);
  double getX();
  double getY();     
private:
  double x;
  double y;
};

class Segment
{
public:
  Segment(double beginX,double beginY,double endX,double endY);
  double length(); //return the length of the segment
private:
  Point beginPoint;
  Point endPoint; 
};

Point的定义很水的……关键只有segment的constructor那里要注意一下，如果data member也是一个自定义类的对象，构造的时候要这样写

Segment::Segment( double beginX,double beginY,double endX,double endY )
    :beginPoint( beginX, beginY ), endPoint( endX, endY )
{
    ;
}