面对对象初级__小练习

using System;
using System.Collections.Generic;
using System.Text;
namespace _052_面对对象初级_小练习
{
    public class Ticket
    {
        private double _distance;
        public double Distance
        {
            get { return _distance; }
        }
        public Ticket(double distance)
        {
            if (distance < 0)
            {
                distance = 0;
            }    
            this._distance = distance;
        }
        private double _price;
        public double Price
        {
            get
            {
                if (Distance > 0 && Distance < 100)
                {
                    return Distance * 1.0;
                }
                else if (Distance >= 100 && Distance < 200)
                {
                    return Distance * 0.95;
                }
                else if (Distance >= 200 && Distance < 300)
                {
                    return Distance * 0.9;
                }
                else
                {
                    return Distance * 0.8;
                }
                //return _price; 
            }
        }
        public void ShowTicket()
        {
            Console.WriteLine("{0}公里，需要{1}元", Distance, Price);
        }
    }
}