负数的怪异Objective-C Mod行为 [英] Weird Objective-C Mod Behavior for Negative Numbers

问题描述

所以我认为当修改后，负数应该放在正数空间中...我无法在objective-c中做到这一点

So I thought that negative numbers, when mod'ed should be put into positive space... I cant get this to happen in objective-c

我希望这样:

-1 % 3 = 2
 0 % 3 = 0
 1 % 3 = 1
 2 % 3 = 2

但是得到这个

-1 % 3 = -1
 0 % 3 = 0
 1 % 3 = 1
 2 % 3 = 2

这是为什么，并且有解决方法?

Why is this and is there a workaround?

推荐答案

result = n % 3;
if( result < 0 ) result += 3;

不要按照其他答案中的建议执行额外的mod操作.它们非常昂贵且不必要.

Don't perform extra mod operations as suggested in the other answers. They are very expensive and unnecessary.

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