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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.lang.c
Subject: Re: question about nullptr
Date: Sun, 7 Jul 2024 04:55:14 -0000 (UTC)
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On Sat, 6 Jul 2024 14:51:19 +0100, bart wrote:

> Using actual zero for a pointer value is crass. This wouldn't work for
> example:
> 
>     char *p = 3;

But of course this does:

    char *p = 0;

From the C23 spec, I found this footnote in §6.6:

    A named constant or compound literal constant of integer type and
    value zero is a null pointer constant. A named constant or
    compound literal constant with a pointer type and a value null is
    a null pointer but not a null pointer constant; it may only be
    used to initialize a pointer object if its type implicitly
    converts to the target type.

That first sentence is so important, you’d think it would be in the main 
text somewhere.