设计一个字母或数制之间的转化程序，小写字母向大写字母的转，大写字母向小写字母的转换，二进制数向十六进制数的转换，十六进制数向二进制数的转换，十六进制数向十进制数的转换。-The design of a letter or number system transformation between the procedures, lowercase letters to uppercase letters of transfer, capital letters to lowercase lette