⑴　　 输入的形式和输入值的范围；字符和字符串

⑵　　 输出的形式；字符和字符串

⑶　　 程序所能达到的功能；题目要求的基本功能和选做要求的功能。

⑷　　 测试数据，包括正确的输入及其输出结果和含有错误的输入及其输出结果。

正确的输入能得到正确的结果，错误的输入回进行相应的错误处理。

-The range of the input form and input character and string value

The output in the form of character and string

The program can achieve the function　the basic functions of the subject requirements and choose to do the required functions.

The test data include the correct input and output and input and output contains errors.

The correct input can get the correct result, the wrong input back to the corresponding error processing.