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Date: 31 Oct 92 06:34:42 GMT
From: munnari.oz.au!yoyo.aarnet.edu.au!news.adelaide.edu.au!cs.adelaide.edu.au!
andrewd@tcgould.tn.cornell.edu  (Andrew Dunstan)
Subject: Re: DATA_ERROR exception problem
Message-ID: <1ct9e2INNajk@huon.itd.adelaide.edu.au>
List-Id: <comp.lang.ada>

In article <X7D8JTH@math.fu-berlin.de>, weberwu@inf.fu-berlin.de (Debora Weber-
Wulff) writes:
|> [Now that we have the umlauts sorted out, the next problem!]
|> 
|> I want to write a compeletly safe input procedure for integers:
|> I GET an integer, and if DATA_ERROR is raised, I want to loop
|> around until I get a decent answer. 
|> 
|> My problem is that DATA_ERROR is raised on two different conditions:
|> an integer being illegal, i.e. out of bounds, or an illegal
|> character being encountered (such as when I enter "1.0" or "z").
|> The problem ist that in the former case, the input buffer has been
|> emptied (all digits read); in the latter, the illegal character
|> (and all following characters) remain in the input buffer.
|> How can I differentiate the two cases, so that I can 
|> GET_LINE (input_garbage, input_garbage_size) and reprompt for input?
|> 

I don't quite understand this. If you want to get an integer, and the input is
"1.0", you should get (at least I get) 1 returned and ".0" left on the input.

However, I think the easiest answer to your question is to read the input
into a string and then do a get from the string. If the whole string is not
used up by the get, you have got some garbage, and you can handle the situation
as you wish.

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