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From: mwm@eris.berkeley.edu (Mike (I'll think of something yet) Meyer)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Can you nest subroutines in C?
Message-ID: <25899@agate.BERKELEY.EDU>
Date: 29 Jun 89 19:49:01 GMT
References: <4495@crash.cts.com> <25874@agate.BERKELEY.EDU> <7173@cbmvax.UUCP>
Sender: usenet@agate.BERKELEY.EDU
Reply-To: mwm@eris.berkeley.edu (Mike (I'll think of something yet) Meyer)
Organization: Missionaria Phonibalonica
Lines: 39

In article <7173@cbmvax.UUCP> kevin@cbmvax.UUCP (Kevin Klop) writes:
<In article <25874@agate.BERKELEY.EDU> mwm@eris.berkeley.edu (Mike (I'll think of something yet) Meyer) writes:
<>Not quite. C (like many other languages) reqiures forward
<>declarations.  Functions and variables are only visible to code that
<>occurs after their decleration in the file.
<
<Excuse me, I beg to differ.  If you do not declare a function before you
<use it, then it is of type ``int'' with a globale scope.  Try this sometime:
<
<main()
<{
<     MyFunction();
<}
<
<char MyFunction();

Well, you implicitly declared the function when you used it's name in
a place that required a function invocation. And it's _still_ only
visible to things after that point in the file.

If you used MyFunction in a place where a function type wasn't
required, then you lose the decleration, and get an "undefined
variable" error.

	MyMetaFunciton(MyFunction) ;

This type of implicit decleration is also available for arguments:

main(argc, argv) char **argv;

Will implicitly declare argc as type int.

	<mike

--
When logic and proportion have fallen softly dead,	Mike Meyer
And the white knight is talking backwards,		mwm@berkeley.edu
And the red queen's off her head,			ucbvax!mwm
Remember what the dormouse said.			mwm@ucbjade.BITNET