如何存储极大数字？ [英] How to store extremely large numbers?

问题描述

例如，我有一个factorial程序，需要保存真正巨大的整数，可以是50+位长。 C ++中的绝对最大原始数据类型为 unsigned long long int ，最大值为 18446744073709551615 ，只有20位数。以下是C ++限制的链接： http://www.cplusplus.com/reference/climits/

For example I have a factorial program that needs to save really huge integers that can be 50+ digits long. The absolute maximum primitive data type in C++ is unsigned long long int with a maximum value 18446744073709551615 which is only 20 digits long. Here's the link to the limits of C++: http://www.cplusplus.com/reference/climits/

如何存储大于某种类型变量的数字？

How do I store numbers that are larger than that in a variable of some sort?

推荐答案

如果你已经有一个boost依赖（这些天，很多人都这样做），你可以使用boost 多精度库。事实上，它已经有一个例子： factorial program ，它可以支持高达128位的输出，虽然扩展更多是非常微不足道的。

If you already have a boost dependency (which many people these days do), you can use the boost multi-precision library. In fact, it already has an example of a factorial program that can support output up to 128 bits, though extending it further is pretty trivial.

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