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From: fjh@mundook.cs.mu.OZ.AU (Fergus Henderson)
Subject: Re: How to print Task_ID type? (GNAT SunOS)
Date: 1996/04/06
Message-ID: <4k50tc$7ge@mulga.cs.mu.OZ.AU>#1/1
X-Deja-AN: 146058733
references: <4xu3yzpoi7.fsf@leibniz.enst-bretagne.fr>
 <4k1ma9$brt@michp1.redstone.army.mil>
organization: Comp Sci, University of Melbourne
newsgroups: comp.lang.ada
Date: 1996-04-06T00:00:00+00:00
List-Id: <comp.lang.ada>

joel@redstone.army.mil (Joel Sherrill) writes:

> I am not sure what the origin of the "%p" printf specifier is but it is
> present for all the C libraries I use.  With it, you can:
>
>   printf( "The address of X is %p\n", &X );

Incidentally, that code fragment has undefined behaviour.
You need to write

    printf( "The address of X is %p\n", (void *) &X );

This is because the C standard allows implementations to represent different
pointer types differently.

(What relevance does this have to comp.lang.ada?  Just another example
of how easy it is to shoot yourself in the foot in languages with less
compile-time and run-time checking.)

--
Fergus Henderson <fjh@cs.mu.oz.au>   |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>   |  of excellence is a lethal habit"
PGP: finger fjh@128.250.37.3         |     -- the last words of T. S. Garp.