From: av568 AT rgfn DOT epcc DOT edu (Beautiful Savior Lutheran Church)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: possible bug?
Date: 29 Mar 1997 06:19:58 GMT
Organization: The Rio Grande Free-Net, El Paso Community College, El Paso, TX
Lines: 58
Message-ID: <5hicae$7m1@news.epcc.edu>
References: <333C801C DOT 112D AT pluto DOT njcc DOT com>
NNTP-Posting-Host: rgfn.epcc.edu
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

shearer AT pluto DOT njcc DOT com wrote:
> This is a multi-part message in MIME format.

> --------------4E3873DB632C
> Content-Type: text/plain; charset=us-ascii
> Content-Transfer-Encoding: 7bit

> ++i
> i++

> when each of these is used in a loop such as below,
>    shouldn't the decision to pre-fix or to post-fix
>    affect the output of said loop?

> the following, compiled and run under djgpp(gcc272),
> with the condition of the for loop being ++i or i++,
> seems to result in the same for both cases.

> such shouldn't be the case, should it?

I don't see the problem. ++i is used in the code as the third part of a 
for loop. This third part is executed at the completion of each loop 
iteration. It makes no difference whether the pre- or post-fix operator 
is used. (I think the poster thought a prefix ++ would cause the variable 
to increment *before* the loop. This is not the case.)

> --------------4E3873DB632C
> Content-Type: text/plain; charset=us-ascii
> Content-Transfer-Encoding: 7bit
> Content-Disposition: inline; filename="test.c"

> #define SNUL '\0'
> #include <stdio.h>

> main(){
> char a[10];
> int  i;
> FILE *IN=NULL;

> if((IN=fopen("test.txt","r"))==NULL)
>         {
>         printf("\nfile does not exist");
>         exit(2);
>         }
> for (i=0;i<9;++i)
> {       a[i]= (char) fgetc(IN);
>         printf("%i\t%c\n",i,a[i]);
> };
> a[i] = SNUL;
> printf("%i\t%c\n",i,a[i]);
>        }

> --------------4E3873DB632C--


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