static void Main(string[] args)
{
//输入A点坐标
Console.Write("点A");
int x1 = 1;
int y1 = 1;
CPoint p1 = new CPoint(x1, y1);
p1.Dispaly();//打印出点
Console.Write("到");
//输入B点坐标
Console.Write("点B");
int x2 = 6;
int y2 = 6;
CPoint p2 = new CPoint(x2, y2);
p2.Dispaly();//打印出点
Console.Write("的距离：");
//两点的距离
CLine l = new CLine(p1, p2);
float dis = l.Distance();
Console.WriteLine("{0:F3}。", dis);//:F3指保留三位小数。
//矩形的周长
int x3 = 8, y3 = 8;
int x4 = 10, y4 = 10;
CPoint p3 = new CPoint(x3, y3);
CPoint p4 = new CPoint(x4, y4);
CLine l1 = new CLine(p1, p2);
CLine l2 = new CLine(p3, p4);
CRect peri = new CRect(l1, l2);
float perimeter = peri.Perimeter();
Console.WriteLine("矩形的周长:{0}", perimeter);
//矩形的面积
float area = peri.Area();
Console.WriteLine("矩形的面积:{0}", area);
Console.ReadKey();
}
public CLine(CPoint p1, CPoint p2)
{
this.p1 = p1;
this.p2 = p2;
}