using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            CPoint c1 = new CPoint();
            CPoint c2 = new CPoint();
            CPoint c3 = new CPoint();
            c1.setpoint(1, 2);
            c2.setpoint(2,4 );
            c3.setpoint(1, 4);
            Cline m = new Cline();
            Console.WriteLine("两点之间距离为： {0}", m.distence(c1, c2));
            Cline m1 = new Cline();
            m.set_length(c3, c2);
            m1.set_length(c1, c3);
            CRect CR = new CRect();
            Console.WriteLine("矩形的周长为： {0}",CR.perimeter(m,m1));
            Console.WriteLine("矩形的面积为： {0}", CR.area(m, m1));
            Console.ReadKey();

        }
    }

   class CPoint 
    { 
        private int x