为铁路部门编写计算运费的程序，题目如下。

using System;using System.Collections.Generic;using System.Linq;using System.Text; namespace ConsoleApplication40{ class Program { static void Main(string[] args) { double x,y; Console.WriteLine("输入行李的重量x:"); x = double.Parse(Console.ReadLine()); if (x <= 50) { Console.WriteLine("每千克0.25元"); y = 0.25 * x; Console.WriteLine("输出托运的费用y={0}:", y); } else { if (x > 50 && x <= 100) { Console.WriteLine("超过的每千克0.35元"); y = (x-50) * 0.35 + 50 * 0.25; Console.WriteLine("托运的费用y={0}:", y); } else { Console.WriteLine("超过的每千克0.45元"); y = (x - 100) * 0.45 + (x - 50) * 0.35 + 50 * 0.25 + 0.25 * x; Console.WriteLine("托运的费用y={0}:", y); } } } }}