定义一个大整型类，可以处理长度为数十位的整数，补充传统的int,long的使用。要求提供+ - 等基本功能。其它* / > < ==运算符也希望都能完成。



给了一个例子，采用stl实现。stl相关内容可以参考资料里的stl讲义与stl例子。-Define a large integer class that can handle dozens of length integer supplement traditional int, long use. Request+- other basic functions. Other* / >　< == operator also hope can be completed. Give an example, using stl implementation. stl relevant content can refer to the information in the stl stl handouts with examples.