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From: ncohen@watson.ibm.com (Norman H. Cohen)
Newsgroups: comp.lang.ada
Subject: Re: Easy way to read FLOAT?
Date: 27 Jan 1995 14:38:48 GMT
Organization: IBM T.J. Watson Research Center
Distribution: world
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References: <3gaihr$hak@pdq.coe.montana.edu>
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Date: 1995-01-27T14:38:48+00:00
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In article <3gaihr$hak@pdq.coe.montana.edu>, icsjp318@gemini.oscs.montana.edu
(Aaron Diesen) writes: 

|> I am working on my first ada program, and I need to read a float.  I ran
|> into problems when trying to input an integer into a float variable
|> (works in other languages).

The Get procedure provided by instances of Text_IO.Float_IO in Ada 83
only accepts real literals optionally preceded by a '+' or '-'.  A real
literal always includes a decimal point--er, radix point--with at least
one digit on each side of it.

The Get procedure provided by instances of Ada.Text_IO.Float_IO in Ada 95
is more liberal, allowing the sames forms that real input in Fortran
allows, including numbers without decimal points and numbers with digits
on only one side of a decimal point.

Your alternatives are: 

   - Read raw characters and compute the Float value yourself.  (It's
        deceptively hard to do this right.)
   - Use an Ada 95 compiler (in which the new rules are fully
        implemented)
   - Change your input file to conform to the Ada-83 rules.

I suggest you ask your instructor what he or she has in mind.

--
Norman H. Cohen    ncohen@watson.ibm.com