本文探讨了C++中NULL的定义及其与0的区别。作者倾向于避免使用宏，并偏好直接使用0来代替NULL。此外，文章还讨论了在预标准代码中NULL可能被不适当地定义为其他值的问题。
In C++, the definition of NULL is 0, so there is only an aesthetic difference. I prefer to avoid macros, so I use 0. Another problem with NULL is that people sometimes mistakenly believe that it is different from 0 and/or not an integer. In pre-standard code, NULL was/is sometimes defined to something unsuitable and therefore had/has to be avoided. That's less common these days.
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