实现大数运算，32bit为一个单位，封装在C++类里，简单易用，速度够快。-Operation to achieve large numbers, 32bit as a unit, encapsulated in C++ class, the easy to use, fast enough.

大数加法,减法,乘法和除法的C语言实现源码,可以帮助实现大数运算,()