如何存储非常大的数字?

How to store extremely large numbers?(如何存储非常大的数字?)

问题描述

例如，我有一个阶乘程序，需要保存可能超过 50 位数字的非常大的整数.C++中的绝对最大原始数据类型是unsigned long long int，最大值18446744073709551615，只有20位长.这是 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/

如何在某种变量中存储大于数字的数字?

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(现在很多人都有)，你可以使用 boost 多精度库.其实它已经有一个factorial program 可以支持高达 128 位的输出，尽管进一步扩展它非常简单.

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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