RE: round not in math.h?

No, this is similar to floor but dangerous. It only truncates the
fractional part and there is a risk that the float will not fit into the
integer:

"An rvalue of a floating point type can be converted to an rvalue of an
integer type. The conversion truncates; that is, the fractional part is
discarded. The behavior is undefined if the truncated value cannot be
represented in the destination type."

Brian

-----Original Message-----
From: Wolfgang Jansen [mailto:[email protected]]
Sent: Monday, September 19, 2005 4:13 AM
To: [email protected]
Cc: Heilig, Brian - ACD ; SmartEiffel
Subject: Re: round not in math.h?


[email protected] wrote:

>
>Now, as it is C99 dependant, it looks a bit hard to write portable code

>using "round". What to do? Use some trick as you proposed? Just
>defining the prototype for round function (as it is in  lib math)? This

>works on some systems but probably not all.
>
>Any other idea?
>
>Philippe Ribet
>
> 
>
Hello,
I think `round' is quite meaningless in C, simply use
double->int conversion instead:
  double d;
  int n;
  n = d;
  /* if you want a double result as for `round': */
  x = n;

Wolfgang Jansen

>Hello,
>
>according to "man round", round function is declared in math.h. But
>while including math.h the C compiler stills complain about undefined
>function. Moreover, I can't find "round" in math.h
>
>Does anyone know something about this problem?
>
>Thanks,
>
>Philippe Ribet
> 
>

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