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From: ark@alice.UUCP
Newsgroups: comp.lang.c
Subject: Re: printf's %D, %O, and %X
Message-ID: <7131@alice.UUCP>
Date: Mon, 27-Jul-87 00:35:53 EDT
Article-I.D.: alice.7131
Posted: Mon Jul 27 00:35:53 1987
Date-Received: Fri, 31-Jul-87 01:44:28 EDT
References: <1667@xanth.UUCP>
Organization: AT&T Bell Laboratories, Liberty Corner NJ
Lines: 19

In article <1667@xanth.UUCP>, kyle@xanth.UUCP writes:
> For a long time now I've been under the impression that using "%D"," %O", and
> "%X" in a printf() conversion spec is equivalent to using "%ld", "%lo", and
> "%lx".  However when I looked at the documentation for printf (4.3 BSD) I
> discovered that capitalizing "%d, "%o", and "%x" are not mentioned at all.
> 
> Do anyone know if printf() used to handle "%D", etc. as outlined above?

Once upon a time, printf used to use %D, %O, %X to mean the same
thing as %ld, %lo, %lx, respectively.  More recent printf
implementations leave %D and %O undefined and use %X to print
an integer in hex using uppercase ABCDEF.  Similarly for %E,
%F, and %G (that is, print 3E10 instead of 3e10).  %ld prints
a long in all implementations, and similarly for %lo, %lx, and %lu.

This dichotomy is mostly my fault.  Sorry about that.


				--Andrew Koenig