'NULL' : undeclared identifier

This is a discussion on 'NULL' : undeclared identifier within the C++ Programming forums, part of the General Programming Boards category; When working with pointers when I use separate files (and sometimes when I use 1 file) I get: error C2065: ...

  1. #1
    Registered User
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    Sep 2004
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    Question 'NULL' : undeclared identifier

    When working with pointers when I use separate files (and sometimes when I use 1 file) I get:

    error C2065: 'NULL' : undeclared identifier

    I did some searching but none of these worked:

    Code:
    #define NULL
    Code:
    #define NULL 0
    Code:
    #define NULL ((void *) 0)
    Code:
    #ifndef NULL
    #ifdef __cplusplus
    #define NULL    0
    #else
    #define NULL    ((void *)0)
    #endif
    #endif
    Code:
    #include <cstdlib>
    In fact, compiling using any these usually crashes the program.

  2. #2
    ATH0 quzah's Avatar
    Join Date
    Oct 2001
    Posts
    14,826
    Well actually, IIRC, you don't even need NULL for anything in C++, since it just evaluates to zero. And defining NULL as zero isn't what makes your program crash. It's your program doing something it shouldn't elsewhere. Like running off the end of an array, dereferencing null pointers, etc etc.

    Quzah.
    Hope is the first step on the road to disappointment.

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