C++ nil vs NULL

Yes. It's NULL in C and C++, while it's nil in Objective-C.

Each language has its own identifier for no object. In C the standard library, NULL is a typedef of ((void *)0). In C++ the standard library, NULL is a typedef of 0 or 0L.

However IMHO, you should never use 0 in place of NULL, as it helps the readability of the code, just like having constant variables in your code: without using NULL, the value 0 is used for null pointers as well as base index value in loops as well as counts/sizes for empty lists, it makes it harder to know which one is which. Also, it's easier to grep for and such.

nil does not exist in standard C++. Use NULL instead.

In C++ you need to use NULL, 0, or in some brand new compilers nullptr. The use of NULL vs. 0 can be a bit of a debate in some circles but IMHO, NULL is the more popular use over 0.

0 is the recommended and common style for C++