中文说明：
编写的是2-4进制转换的功能函数，而进制转化是进行QAM调制的必须元件，而且可根据次程序进行编写其他进制的转换。
English Description：
The function function of 2-4 hexadecimal conversion is written, and hexadecimal conversion is a necessary component for QAM modulation, and other hexadecimal conversion can be written according to the sub program