From:	mert0407 AT sable DOT ox DOT ac DOT uk (George Foot)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Help with Allegro getpixel()
Date:	13 May 1997 23:41:57 GMT
Organization:	Oxford University, England
Message-ID:	<5lau85$4ua@news.ox.ac.uk>
References:	<863525228 DOT 17268 DOT 0 DOT nnrp-2 DOT 9e9829a4 AT news DOT demon DOT co DOT uk>
NNTP-Posting-Host:	sable.ox.ac.uk
Lines:	42
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

BDC Client Team (cs19 AT cityscape DOT co DOT uk) wrote:

:  for (y1=0; y1++; y1<32) 
:  {
:   for (x1=0; x1++; x1<32) 
:   {
:    p=getpixel(s2,x1,y1);         
:    if ((p!=0) && (p!=-1))                    
:     {
:      sprintf(msg,"Colour=%d\n", p);
:      textout(screen, font, msg,0,0+(10*y1),38);
:     }
:    }
:   }
:      
: Any ideas anyone?

Yes, you got the for statements the wrong way around. for statements work
like this:

for (initialisation;test;action) do_something;

means

initialisation;
while (test) {
 do_something;
 action;
}

where initialisation, test, action and do_something are
expressions/statements. Normally you write:

for (x=0;x<10;x++) printf("x=%d\n",x);

You had the test and action the wrong way around.

HTH

-- 
George Foot <mert0407 AT sable DOT ox DOT ac DOT uk>
Merton College, Oxford

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