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，用不同的语言写出独特风格更加实用的CRC 计算程序。-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 to write unique style more practical calculation of the CRC process.