＆QUOT;向后＆QUOT;用C条件语句

我期待通过一些code和我发现了一些奇怪的条件语句，即：

I'm looking through some code and I found some strange conditionals, namely:

if (NULL != buf) {...}

我想知道是否有写有条件这样一个特别的原因，而不是

I was wondering if there was a particular reason for writing the conditional like this, instead of

if(buf != NULL){...}

我看不到任何理由这样做了我的头顶部的第一种方式，但我不认为这是一个错误。对我来说，好像他们完成同样的事情，但第二个方式是方式更直观。有没有办法使用的第一个条件的一些具体原因是什么？

I can't see any reason to do it the first way off the top of my head, but I don't think it was a mistake. To me, it seems like they accomplish the same thing, but the second way is way more intuitive. Is there some specific reason to use the first conditional?