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From: wittig@gmdzi.UUCP (Georg Wittig)
Newsgroups: comp.lang.c
Subject: Re: do...while vs. repeat...until (was: Errors aren't that simple)
Keywords: loops,while,repeat
Message-ID: <2144@gmdzi.UUCP>
Date: 28 Mar 90 09:38:28 GMT
References: <16188@haddock.ima.isc.com> <9130009@hpavla.AVO.HP.COM> <IEC2SG5xds13@ficc.uu.net> <Mar.22.11.04.57.1990.7791@paul.rutgers.edu> <KZB#G{_@rpi.edu> <1539@amethyst.math.arizona.edu>
Organization: GMD - The German National Research Centre for Computer Science
Lines: 36

raw@math.arizona.edu (Rich Walters) writes:

>		loop
>			{ statement }
>		{while (expr) | until (expr)}
>			{ statement }
>		repeat		

>This allows _complete_ freedom in where you check for loop termination.  You
>can check at the beginnig the end or _anywhere_ in between!!!

>I think this is the bestest ever!!!!!!

Personally, I prefer that style, too. But alas, there are situations where it
is far from optimal. Example

	for (i=0;   i<2700;   ++i,++j,--k,m=f(x)) {
		...
		if (condition1) continue;
		...
		if (condition2) continue;
		...
		if (condition14) continue;
		...
	}

Try to convert that into the general form. It won't look good and clearly
arranged.

Apart from that, I must admit that a for statement makes the control of the
loop much more clear and compact.
-- 
Georg Wittig   GMD-Z1.BI   P.O. Box 1240   D-5205 St. Augustin 1 (West Germany)
email: wittig@gmdzi.uucp   phone: (+49 2241) 14-2294
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