Message-ID: <32A02DD1.1157@pobox.oleane.com>
Date: Sat, 30 Nov 1996 13:51:29 +0100
From: Francois Charton <deef AT pobox DOT oleane DOT com>
Organization: CCMSA
MIME-Version: 1.0
To: Morten Welinder <terra AT diku DOT dk>
CC: djgpp AT delorie DOT com
Subject: Re: Problems with DJGPP V2.01 - atof() function
References: <329e68a5 DOT 10316617 AT news DOT ua DOT pt> <57mtq1$4mo AT vidar DOT diku DOT dk>
Content-Type: text/plain; charset=us-ascii
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Morten Welinder wrote:
> 
> afonso AT inesca DOT inesca DOT pt writes:
> 
> >                char string[]="1.13";
> >                int  result;
> >                ...
> >                result = (int)(atof(string)*100);
> >                ...
> 
> >        I've got result = 112!!! not 113 as I wished, because
> >the function atof() return is 1.29999... not 1.13 (and I only have
> >an old i386).
> 
> Getting 112 is well within the C standard.  If your program does
> not work in this situation then you have a bug.
> 

Sorry to disagree but this *is* a bug : to be sure try the following 
program : 

int main(void)
{
char ch[8]="1.13";
int result, otherresult;
float f;
result=(int)(atof(ch)*100.0);
f=atof(ch)*100.0;
otherresult=(int) f;
printf("result: %d otherresult:%d\n", result, otherresult);
return 0;
}

On my machine I get result: 112 and otherresult: 113...

Francois