64位有符号整数有多大？ [英] How big can a 64bit signed integer be?

问题描述

在 redis 中，

HINCRBY支持的值范围限制为64位有符号
整数。

The range of values supported by HINCRBY is limited to 64 bit signed integers.

我想知道64位有符号整数有多大。如果这是常识，我很抱歉，我的背景是经济学，没有人告诉我那里的问题答案。

And I'd like to know how big can that 64 bit signed integer be. I'm sorry if this is common knowledge, my background is Economics and no one told me the answer to the question there.

提前致谢：）

推荐答案

本文适用于有关此主题的更多信息： http://en.wikipedia.org/wiki/Integer_(computer_science)

This article is good for more information about this topic: http://en.wikipedia.org/wiki/Integer_(computer_science)

所以答案是问题应该是：
从-9,223,372,036,854,775,808到9,223,372,036,854,775,807，
或从 - （2 ^ 63）到2 ^ 63 - 1

So the answer to the question should be: From -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807, or from −(2^63) to 2^63 − 1

最高存储在signed int中的正数表示为二进制为

The highest positive number stored in a signed int is represented binary as

----- 63个-----

0111111111111111111111111111111111111111111111111111111111111111

如果你仔细想想你可以发现这个数字恰好是2 ^ 63 - 1。

If you think carefully you can find out that this number is exactly 2^63 - 1.

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