Error C2065 Null
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Visual C++ Null Undeclared Identifier
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Error C2065 'cin' Undeclared Identifier
Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up set head error c2065 'hmonitor' undeclared identifier to NULL ('NULL' : undeclared identifier) up vote 3 down vote favorite I defined a linked list in C++. I am trying to set a NULL value to the variable head (in the constructor of Movie_LinkedList), but I got: movie.h(40): error C2065: 'NULL' : undeclared identifier please note that I can't include any library except of iostream Any help appreciated! c++ pointers null share|improve this error c2065 '__func__' undeclared identifier question edited Mar 21 '13 at 14:15 asked Mar 21 '13 at 14:09 Alon Shmiel 171134695 1 That's because NULL hasn't been defined. Either define it or set head = 0 –Nick Mar 21 '13 at 14:11 Why did you delete your code? –drheart Mar 21 '13 at 14:16 because there are students that can copy my code.. –Alon Shmiel Mar 21 '13 at 14:17 They still can; it's in the edit history. –Chowlett Mar 21 '13 at 14:17 1 Woe to those students who copy broken code! :-P –metal Mar 21 '13 at 16:33 add a comment| 5 Answers 5 active oldest votes up vote 8 down vote accepted It isn't defined in your program. Usually, that's defined in a standard header file (specifically cstddef or stddef.h). Since you're restricted to iostream, if yours doesn't get NULL implicitly from that header, you can also use 0 or, in C++11, nullptr, which is a keyword and doesn't require a header. share|improve this answer edited Mar 21 '13 at 14:29 answered Mar 21 '13 at 14:11 metal 2,0211328 including a header fi
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Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join http://stackoverflow.com/questions/15549873/set-head-to-null-null-undeclared-identifier them; it only takes a minute: Sign up Why is NULL undeclared? up vote 47 down vote favorite 7 I have a problem with this struct contructor when I try to compile this code: typedef struct Node { Node( int data ) // { this->data = data; previous = NULL; // Compiler indicates here next = NULL; } int http://stackoverflow.com/questions/924664/why-is-null-undeclared data; Node* previous; Node* next; } NODE; when I come this error occurs: \linkedlist\linkedlist.h||In constructor `Node::Node(int)':| \linkedlist\linkedlist.h|9|error: `NULL' was not declared in this scope| ||=== Build finished: 1 errors, 0 warnings ===| Last problem was the struct, but it worked fine when it was in my main.cpp, this time it's in a header file and is giving me this problem. I am using Code::Blocks to compile this code c++ syntax nodes share|improve this question edited May 29 '09 at 6:35 unwind 254k38331460 asked May 29 '09 at 6:30 TheTeh add a comment| 5 Answers 5 active oldest votes up vote 81 down vote NULL is not a built-in constant in the C or C++ languages. In fact, in C++ it's more or less obsolete, just use a plain literal 0 instead, the compiler will do the right thing depending on the context. In newer C++ (C++11 and higher), use nullptr (as pointed out in a comment, thanks). Otherwise, add #include <stddef.h> to get the NULL definition. share|improve this answer edited Jul 29 '13 at 1
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years ago Last modified 9 years ago [thread] error C2065: 'NULL' : undeclared identifier in thread_primitives.hpp Reported by: faridz@… Owned by: anthonyw Milestone: Boost 1.35.0 Component: thread Version: Boost Development Trunk Severity: Showstopper Keywords: Cc: Description The stdcxx is the another implementation of the STL (initially based on RogueWave? STL). The following errors are encountered when running boost regression tests on msvc with stdcxx-4.2.0. d:\boost\boost\boost\thread\win32\thread_primitives.hpp(184) : error C2065: 'NULL' : undeclared identifier d:\boost\boost\boost\thread\win32\thread_primitives.hpp(184) : error C2065: 'NULL' : undeclared identifier I propose to add #include