购物系统，列表列出商店中的所有商品、数量级价格，系统对客户的每次购物情况进行记录，年中进行统计可户的消费情况-Shopping system, list all the goods listed in the store, the price of magnitude, the system for each customer' s shopping record of the situation in mid-year statistics available household con

In contrast to BigIntegers this class doesn t fake two s complement representation. Any Bit-Operations, including Shifting, solely regard the unsigned magnitude.

An immutable signed integer of arbitrary magnitude for Andriod.

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