为铁路部门编写计算运费的程序。假设铁路托运行李，规定每张客票托运费计算方法是：行李重量不超过50kg时，每千克0.25元；超过50kg而不超过100kg时，其超出部分每千克0.35元时；超过100kg时，其超过部分每千克0.45元。要求从键盘上输入行李重量后，程序计算并输出托运的费用。-Calculate the shipping cost for the railway sector to write a program. Assuming railway baggage, provisions consignment fee per ticket is calculated by: baggage weighing no more than 50kg, each kilogram 0.25 yuan　than 50kg and not exceed 100kg, its excess is 0.35 yuan per kilogram　than 100kg, the excess section 0.45 yuan per kilogram. Requires input from the keyboard baggage weight, the program calculates and outputs shipping fee.