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syntax question

 
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rikotech8



Joined: 10 Dec 2011
Posts: 376
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syntax question
PostPosted: Sun Aug 19, 2012 11:33 am     Reply with quote

Hello!
What is the difference between ++value and value++.
I searched into the books I have, but unsuccessfully.
Thanks a lot in advance!
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Aug 19, 2012 11:48 am     Reply with quote

Do a Google search for this:
Quote:

increment OR pre-increment post-increment in C

Copy and paste it into Google.
asmboy



Joined: 20 Nov 2007
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PostPosted: Sun Aug 19, 2012 6:42 pm     Reply with quote

i'm personally very fond of:
Code:

++--++var;
 


which does compile and work as expected Very Happy Very Happy
bkamen



Joined: 07 Jan 2004
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PostPosted: Sun Aug 19, 2012 9:05 pm     Reply with quote

asmboy wrote:
i'm personally very fond of:
Code:

++--++var;
 


which does compile and work as expected Very Happy Very Happy


Hahahah. Dork. Hahahaha...

Very funny indeed.
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Mon Aug 20, 2012 2:00 am     Reply with quote

Seriously the comment about searching books, does worry. This is in every basic C textbook.

PCM programmer's answer, points to loads of places explaining it, but it is equally easy in a situation like this, to test for yourself.
Code:

   int8 post, pre, result;
   post=1;
   result=post++;
   printf("%d result   %d post\n\r",result,post);
   pre=1;
   result=++pre;
   printf(%d result   %d pre\n\r",result,pre);

put a basic processor define, and main, and run it in something like MPLAB, or on a real PIC, and you will see exactly what the difference is.

If in doubt, on any operation like this, a basic test like this takes hardly any more time than asking the question, and you then 'know' exactly what happens.

Best Wishes
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