Pointers: NULL vs. 0

[franz]

No it doesn't matter. A pointer is in the end just an integer. The null pointer can either be:

#define NULL 0

#define NULL 0

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or

#define NULL ((void *)0)

#define NULL ((void *)0)

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More often than not, the former is used.

In the C++0x standard that is still in the making, plans are to deprecate the above definitions and introduce a null pointer called nullptr_t, to prevent the following confusion:

void func(int i);
void func(const char *t);

void func(int i);
void func(const char *t);

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