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for(j=7; j>-1; j-=2) cause infinite loop

 
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khannic



Joined: 09 Dec 2008
Posts: 4

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for(j=7; j>-1; j-=2) cause infinite loop
PostPosted: Sun Feb 01, 2009 1:54 pm     Reply with quote
Code:
int j;

for(j=7; j>-1; j-=2){
   printf("%d ", j);
}


The result is 7 5 3 1 -1 -3 -5.... and loop is never end. What happened ?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Feb 01, 2009 2:13 pm     Reply with quote
In CCS, an 'int' is an unsigned 8-bit integer. All CCS integer data types
are unsigned by default (different from the C standard).

Download the CCS manual:
http://www.ccsinfo.com/downloads/ccs_c_manual.pdf
Look at this table, on page 49 in the Acrobat Reader:
Quote:
Basic and Special types

On page 50 (in Acrobat reader), it says this:
Quote:
Note: All types, except float, by default are unsigned;


To get a signed variable, you need to declare it like this:
Code:
signed int j;
khannic



Joined: 09 Dec 2008
Posts: 4

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PostPosted: Sun Feb 01, 2009 2:24 pm     Reply with quote
that's works thx for very rapid reply Surprised
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