说明：  巨型整数的C＋＋实现。可以与int,long,string类型进行+,-,*,/,％,+=,-=,*=,/=,％=,比较大小，相互转换等运算
(Huge integer C to achieve. Can be int, long, string type 2B !,-,*,/,, 2B !=,-=,*=,/=,=, relatively small, the mutual conversion operator)