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Project : Parking Information System
项目：停车信息系统
Overall description:
总体描述
Your team is employed for the implementation of a parking management software for a three-level parking facility.
你的团队受雇开发一套针对三层楼面的停车场的停车管理软件
Customer specifications:
客户提出的规范要求：
There are 3 levels in the parking facility, where each level can be represented by a 8′20 rectangular grid of car slots. There are two entrances and two exits located at opposite sides of the ground level. When a car enters, its registration is recorded and a specific car slot is allocated. This allocation is determined automatically in random, for the level the customer prefers. Charges are calculated according to the hours of stay and paid at the exit desk.
停车场分3层，每层都分为8*20个长方形的停车位。在底楼有双进双出口，对面布置。当一辆车进入时，注册信息会被记录下来，并被指派一个停车位。该停车位在车主（客户，原文）指定的楼面随机选定。停车费根据停车的时间计算并且在出口服务台支付。
The system can also provide the facility to have regular customers, where their accounts accumulate the charges, so that they can pay when they are asked to, or have pre-paid parking time.
该软件同时能为停车场建立注册客户(老客户，原文)系统，并在他们的账户中累计停车费用。这些客户可以在被要求支付费用时缴付，也可以预支停车费用（时间，原文）。
The system should allow the following users to operate it:
该系统应允许以下人员进行操作：
? A manager who can set/change the charge tables, create/amend regular customer accounts (which should include names, addresses and car registration numbers) and also credit the existing accounts of the registered customers.
一个经理，能设定/调整收费表，建立/修改注册客户（老客户，原文）账号(账号中应包括姓名、住址及车的注册号码)，以及为已有注册客户记账。
? An entrance desk operator to record the information of either a registered regular customer or a casual customer (via the car plate number). Also, the allocation of a car slot should be provided by this subsystem.
入口服务台操作员，记录注册客户或随机客户(通过车牌号)的信息。此外，停车位的分派也应由这个子系统完成。
? An exit desk operator who can free a previously allocated car slot, charge the leaving customer accordingly and record exit times.
出口服务台操作员，清空一个不再使用的停车位，向离开的客户收取相应费用并记录离开时间。