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From: spaf@cs.purdue.edu (Gene Spafford)
Newsgroups: comp.windows.x
Subject: Re: stupid C question
Message-ID: <5703@medusa.cs.purdue.edu>
Date: 30 Dec 88 01:55:48 GMT
References: <8812300028.AA17754@EXPO.LCS.MIT.EDU>
Sender: news@cs.purdue.EDU
Reply-To: spaf@cs.purdue.edu (Gene Spafford)
Organization: Department of Computer Science, Purdue University
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In article <8812300028.AA17754@EXPO.LCS.MIT.EDU> rws@EXPO.LCS.MIT.EDU (Bob Scheifler) writes:
>#define foo "abcde"
>Is sizeof(foo) defined to be 5, 6, or >=5?  My Sun compiler gives 6,
>I have a bug report claiming it should be 5, and the C manuals I have
>are no help.

It's 6.  The string "abcde" defines 6 storage locations (the trailing
null is one of them), so the size of the array so defined is 6 characters.

If you do the following:

int arr[3];
printf("%d\n", sizeof(arr));

you should get 3 * sizeof(int)  (12 on a Sun or Vax).

In general, sizeof (array_name) = (number_of_elements * sizeof_element).
A literal string in a special case of this.
-- 
Gene Spafford
NSF/Purdue/U of Florida  Software Engineering Research Center,
Dept. of Computer Sciences, Purdue University, W. Lafayette IN 47907-2004
Internet:  spaf@cs.purdue.edu	uucp:	...!{decwrl,gatech,ucbvax}!purdue!spaf