说明：  本文从理论上推导出CRC 算法实现原理，给出三种分别适应不同计算机或微控 制器硬件环境的C 语言程序。读者更能根据本算法原理，用不同的语言编写出独特风格 更加实用的CRC 计算程序。
(is theoretically derived from the CRC algorithm theory, Adaptation were given three different computer or micro-controller hardware environment of the C Programming Language. According to the better the algorithm is used to a different language unique style more practical calculation of the CRC process.)