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Message: [QUOTE="James Kuyper, post: 5029586"] Even there. Section 2 of annex C of the C++ standard has 3 1/2 pages listing the ways in which the C++ version of the C standard library differs from the C version. Unless you're familiar with precisely what those differences are, you shouldn't assume that information about the C++ version will be valid for the C version. Since only C/C++ experts are likely to have that information, it's generally not a good idea for a newbie to go to the wrong place for such information. The only difference that matters for stdio.h is that NULL is a required to be a C++ null pointer constant, rather than a C null pointer constant. The simplest consequence is that NULL cannot expand to an expression with type void*. The other consequence is that NULL can expand to any one of several types of things that would not qualify as integer constant expressions in C, such as: 1. An expression referring to a non-volatile const-qualified object of integral or enumeration type, initialized with a integer constant expression. 2. A value of type std::nullptr_t, such as nullptr. 3. A call to a constexpr function or constructor. Offhand I can't come up with any way for this difference to affect a strictly conforming C program, unless it makes use of the new C2011 _Generic feature, which is not (yet?) a part of C++. [/QUOTE]