实现40位整数的加减乘除运算，正确率高，效率高！是C++编程中的好题

此代码完成了大整数（BigInt）的计算功能。作为N进制计算的基础代码，可继续拓展。-Completed a large integer code (BigInt) of computing. As the basis for calculating N binary code, can continue to expand.

利用运算符重载实现链接表的直接加减运算等功能-Use operator overloading to achieve directly linked table subtraction functions