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Home/ Questions/Q 7879785
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Editorial Team
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Editorial Team
Asked: June 3, 20262026-06-03T03:58:59+00:00 2026-06-03T03:58:59+00:00

I wonder if does: void *ptr = NULL; printf(%p\n, ptr); Will always gives (nil)

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I wonder if does:

void *ptr = NULL;
printf("%p\n", ptr);

Will always gives (nil) output?

Does it depend on standard library implementation, or it’s a C99 standard specification?

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  1. Editorial Team
    Editorial Team
    2026-06-03T03:58:59+00:00Added an answer on June 3, 2026 at 3:58 am

    On my system it yields (null) so I guess it’s implementation defined. More generally, everything %p prints is implementation-defined:

    7.21.6.1

    The argument shall be a pointer to void. The value of the pointer is
    converted to a sequence of printing characters, in an
    implementation-defined manner.

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