1.支持的运算类型有:+(加) -(减) *(乘) /(除并求余) (求余). 2.支持正负数的运算. 3.支持大数阶乘. 4.由于运用了vector类，原则上支持任意大的整数运算.-1. To support the types of operations are:+ (plus)- (by)* (x)/(in addition to, and seeking more than) (for more). 2. In support of plus or minus the nu