c++写的简单的巨型整数，可以实现+—*等运算，除法还未完成-c++ to write a simple giant integer, can be achieved+-* such operations, the division yet to be completed

巨型整数类，可以执行对超出long long范围的巨型整数的运算，多种构造方式，经大量数据测试无bug。(The giant integer class can perform operations on large integers over the long long range, multiple construction methods, and a large number of data tests without bug.)