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 letters of the conversion, the binary number to hexadecimal number conversion, the hexadecimal number to binary conversion, hexadecimal number to decimal number conversion.