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Re: simple session question [message #175768 is a reply to message #175763]

Sun, 23 October 2011 18:35

Jerry Stuckle
Messages: 2598
Registered: September 2010

Karma:

Senior Member

On 10/23/2011 1:06 PM, Thomas Mlynarczyk wrote:
> Jerry Stuckle schrieb:
>
>> The problem here is you are setting the value in the operand ($!foo)
>> twice in the same expression. Results of such operations is always
>> undefined in C.
>
> In other words: if it were two different variables, like a = b++, there
> would be no problem and the result would always be the same, so the
> compiler can "choose" how it will do the work. And if there is then a
> case where the two variables are the same, the compiler will just "do as
> usual", but in this case the result will depend on how it does it.
>
> Greetings,
> Thomas
>

Exactly. When there are two variables, it doesn't matter whether the
actual increment of b is done before or after the assignment of the old
value into a.

--
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Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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[Message index]

		simple session question By: cerr on Fri, 21 October 2011 17:44
		Re: simple session question By: Thomas Mlynarczyk on Fri, 21 October 2011 18:19
		Re: simple session question By: Jonathan Stein on Fri, 21 October 2011 18:51
		Re: simple session question By: Thomas Mlynarczyk on Fri, 21 October 2011 20:00
		Re: simple session question By: Jerry Stuckle on Fri, 21 October 2011 20:14
		Re: simple session question By: Thomas Mlynarczyk on Fri, 21 October 2011 22:50
		Re: simple session question By: Jerry Stuckle on Fri, 21 October 2011 23:05
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 13:40
		Re: simple session question By: Richard Damon on Sat, 22 October 2011 21:19
		Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 21:56
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 22:35
		Re: simple session question By: Tim Streater on Sat, 22 October 2011 22:43
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 23:56
		Re: simple session question By: Richard Damon on Sat, 22 October 2011 23:29
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 23:54
		Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 00:12
		Re: simple session question By: Richard Damon on Sun, 23 October 2011 01:13
		Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 07:44
		Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 15:31
		Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 16:18
		Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 17:14
		Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 17:16
		Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 17:00
		Re: simple session question By: Richard Damon on Sun, 23 October 2011 19:28
		Re: simple session question By: Jerry Stuckle on Sun, 23 October 2011 03:03
		Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 17:06
		Re: simple session question By: Jerry Stuckle on Sun, 23 October 2011 18:35
		Re: simple session question By: The Natural Philosoph on Fri, 21 October 2011 23:32
		Re: simple session question By: Luuk on Sat, 22 October 2011 10:01
		Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 14:27
		Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 14:37
		Re: simple session question By: Luuk on Sat, 22 October 2011 15:08
		OT: and even in Dart .........Re: simple session question By: Luuk on Sat, 22 October 2011 15:17
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 15:54
		Re: OT: and even in Dart .........Re: simple session question By: Luuk on Sat, 22 October 2011 16:47
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 17:34
		Re: OT: and even in Dart .........Re: simple session question By: Norman Peelman on Sat, 22 October 2011 20:08
		Re: OT: and even in Dart .........Re: simple session question By: Jerry Stuckle on Sat, 22 October 2011 20:28
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 23:39
		Re: OT: and even in Dart .........Re: simple session question By: Norman Peelman on Sun, 23 October 2011 02:40
		Re: OT: and even in Dart .........Re: simple session question By: Jerry Stuckle on Sun, 23 October 2011 03:05
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 21:52
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 23:25
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 07:41
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 22:56
		Re: OT: and even in Dart .........Re: simple session question By: Norman Peelman on Sun, 23 October 2011 02:52
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 15:12
		Re: OT: and even in Dart .........Re: simple session question By: Tim Streater on Sun, 23 October 2011 08:39
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 08:40
		Re: OT: and even in Dart .........Re: simple session question By: Tim Streater on Sun, 23 October 2011 08:43
		Re: OT: and even in Dart .........Re: simple session question By: Peter H. Coffin on Sat, 05 November 2011 20:04
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sat, 22 October 2011 21:47
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 23:22
		Re: OT: and even in Dart .........Re: simple session question By: The Natural Philosoph on Sun, 23 October 2011 07:40
		Re: OT: and even in Dart .........Re: simple session question By: Thomas Mlynarczyk on Sun, 23 October 2011 15:04
		Re: OT: and even in Dart .........Re: simple session question By: Peter H. Coffin on Sat, 05 November 2011 20:00
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 13:39
		Re: simple session question By: cerr on Fri, 21 October 2011 21:43
		Re: simple session question By: Thomas Mlynarczyk on Fri, 21 October 2011 22:47
		Re: simple session question By: Jerry Stuckle on Fri, 21 October 2011 23:06
		Re: simple session question By: cerr on Fri, 21 October 2011 21:17
		Re: simple session question By: Thomas Mlynarczyk on Sat, 22 October 2011 13:50
		Re: simple session question By: Denis McMahon on Sun, 23 October 2011 15:47

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