本文介绍了rand() 的奇怪行为的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
为什么条件 rand() % 3 大约每 3 次为真?rand 真的是随机的，不是吗?
Why condition rand() % 3 is true approximatelу EVERY 3 time ? rand is REALY random isn't it ?
推荐答案
当然，您意识到即使是一枚公平的硬币也可以让您连续十次正面朝上.有一个概率可以分配给该组合.
You realize, of course, that even a fair coin can give you ten heads in a row. There's a probability that can be assigned to that combination.
一枚公平的硬币会在多次试验中产生一半正面和一半反面，但不能保证在较短的时间内达到 50/50.
A fair coin will give half heads and half tails over many trials, but it's not guaranteed to be 50/50 over a shorter run.
您自己对物理世界的体验告诉您，您的结论是错误的.rand() 也是如此.
Your own experience of the physical world tells you that your conclusion is incorrect. Same is true for rand().
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