未初始化的变量如何获得随机值? [英] How does an uninitialized variable get a random value?

问题描述

假设我声明了一个变量x，并且未对其进行初始化.我继续打印它的价值.我看到一些垃圾.

Suppose I declare a variable x and leave it uninitialized. I go on to print its value. I see some junk.

它来自哪里?还有为什么不使用它来生成随机数呢?我的意思是不要使用伪随机生成器.

Where does it come from? Also why is it not used to generate random numbers? I mean instead of using a pseudo random generator.

推荐答案

随机"值就是该位置存储在内存中的值.释放内存时，通常不会擦除/清零内存，因此在那里存在的所有内容都将持续存在，直到被覆盖为止.

The 'random' value is simply what's left in memory at that location. Memory usually isn't erased/zeroed when it's freed so whatever was there will linger until it's overwritten.

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