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Re: simple session question [message #175768 is a reply to message #175763] Sun, 23 October 2011 18:35 Go to previous messageGo to previous message
Jerry Stuckle is currently offline  Jerry Stuckle
Messages: 2598
Registered: September 2010
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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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