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From: eyal@wisdom.BITNET (Eyal mozes)
Newsgroups: net.lang.ada
Subject: Re: Numeric Conversion
Message-ID: <8606120856.AA07663@ucbvax.Berkeley.EDU>
Date: Thu, 12-Jun-86 04:57:27 EDT
Article-I.D.: ucbvax.8606120856.AA07663
Posted: Thu Jun 12 04:57:27 1986
Date-Received: Sun, 15-Jun-86 07:15:56 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 27

> Now we have encountered a problem, trivial by  nature,  which  has  us
> baffled.   The problem is simply that of obtaining the integer part of
> a positive fixed-point value.  We can find no simple way of  achieving
> this  in Ada: use of numeric conversion leads to uncertainty regarding
> the direction of rounding (ARM 4.6 p7).

Well, one way is to substract 0.5 from the number before converting
it; this should always give you the correct result.

Another way is to use the following function (which I write when I
had to do the same thing a few months ago:

function integer_part(value: real) return integer is
   temp: integer := integer(value);
begin
   if real(temp) > value then
      return temp-1;
   else
      return temp;
   end if;
end;

        Eyal Mozes

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