Objective-C:模态偏差

问题描述

使用:

value = arc4random() % x

如何避免或消除模偏差?

How can I avoid or eliminate modulo bias?

至少根据Wikipedia所说，当对机会游戏进行编程时，模偏差是一个问题.

At least according to Wikipedia, modulo bias is an issue when programming games of chance.

推荐答案

arc4random返回一个32位无符号整数(0到2 -1).

arc4random returns a 32-bit unsigned integer (0 to 2-1).

对于足够小的x，可能没有明显的模偏差.但是，如果您确实要确定，请执行以下操作:

There will probably be no noticable modulo bias for small enough x. However, if you want to be really sure, do this:

y = 2 其中2 < x≤2

y = 2 where 2 < x ≤ 2

val = arc4random() % y;
while(val >= x)
    val = arc4random() % y;

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