使用菜单选择程序

[问题描述] 菜单是应用程序的界面，控制语句用来改变程序执行的顺序，是实现结构化程序设计的基础。设计一个比较实用的菜单，通过菜单选择不同的功能。

设计分为两步：首先设计一个含有多个菜单项的菜单演示程序，然后再为这些菜单项配上相应的功能。

[基本要求]

程序运行后，给出6个菜单项的内容和输入提示。

使用数字1-6来选择菜单项，其他输人则不起作用。

1.　　功能要求（包括输入、输出、精度等方面的要求）：

2.　　运行环境要求：

-Use the menu to select the program descr iption of the problem menu is the interface of the application, control statements used to change the order of program execution, is the basis of structured programming. Design a practical menu through the menu to select different functions. The design is divided into two steps: the first contains a number of menu items to design a menu demo program, and then coupled with the corresponding function for these menu items. The basic requirements of the program runs given six menu items and input prompts. Using the digits 1-6 to select the menu item, the other input does not work. Functional requirements (including input, output, and accuracy requirements): 2. Operating environment requirements: