设计内容：编码实现大小写字母之间、二进制和十六进制之间，以及十六进制和十进制之间的转换。



目的与要求：从键盘输入字母或数字，输出相应的转换结果。在出现的界面中，输入“b”开始转换；输入“q”退出。

-Design content: encoding realize case letters, between binary and hexadecimal between, and hex and decimal conversion between.



Purpose and requirements: from the keyboard input letters or digital output, the transformation of the corresponding results. In case of any interface, input "b" began to switch　Input "q" exit.