主要是阐述了运用重载运算符较完美的实现了大数的加减乘除运算，其中乘法用到俄罗斯算法，语言非常简练。-Is mainly explained the use of overloaded operator, the more perfect realization of the large numbers of addition and subtraction multiplication and division operations, including multiplication algor

大数加法减法乘法只支持大数减小数对乘积的结果进位 -Large number of add and subtract