Newsgroups: comp.os.msdos.djgpp
Subject: Re: simple thing
From: vischne AT ibm DOT net-nospam (root)
Organization: The Light
References: <34455CCF DOT 41C6 AT jcu DOT edu DOT au>
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Date: 16 Oct 97 02:59:25 GMT
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In article <34455CCF DOT 41C6 AT jcu DOT edu DOT au>, Oon DOT Lin AT jcu DOT edu DOT au says...
>
>Hi !
>
>I was doing a simple printf but it seems like I don't get the result I
>want...
>
>The statement was  :
>
>  printf("Vertical Retrace Time = %f \n", 1/70) ;
>
>
>I was careful to use '\n' to force the statement above to be printed out
>but what I got was
>
>   Vertical Retrace Time = 0.000000
>
>
>Wha ??? 
>
>
>When I cast the calculation 
> 
>  printf("Vertical Retrace Time = %f \n", (float)(1/70)) ;
>
>I got the result that I want....
>
>Is this a bug in GNU ??
>
No, it's a feature in C.  You're dealing with a variable length, untyped,
argument list.  Without the cast to ensure you get a float of the proper
type for the format string, anything can happen, and generally does, in
all C compilers.