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From: "Steve Doiel" <nospam_steved94@attbi.com>
Newsgroups: comp.lang.ada
References: <bf8dbe70.0112101352.20a3d257@posting.google.com>
Subject: Re: Incompatible type error handling
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Date: Tue, 11 Dec 2001 03:19:20 GMT
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Date: 2001-12-11T03:19:20+00:00
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Here is a small sample program that illustrates some crude error handling,
but you may find some suprises:

with Ada.Integer_Text_Io;
with Ada.Float_Text_io;
with Ada.Text_io;

procedure Input_Demo is

  integer_value : Integer;
  float_value : Float;

begin
  loop
    begin
      Ada.Text_Io.Put( "Enter an Integer > " );
      Ada.Integer_Text_Io.Get( integer_value );
      Ada.Text_Io.Skip_Line;
      exit;
    exception
      when others =>
        Ada.Text_Io.Put_Line( "That's not a valid integer" );
        Ada.Text_Io.Skip_Line;
    end;
  end loop;
  Ada.Text_Io.Put( "You entered " );
  Ada.Integer_Text_Io.Put( integer_value );
  Ada.Text_Io.New_Line;


  loop
    begin
      Ada.Text_Io.Put( "Enter a floating point value > " );
      Ada.Float_Text_Io.Get( float_value );
      Ada.Text_Io.Skip_Line;
      exit;
    exception
      when others =>
        Ada.Text_Io.Put_Line( "That's not a valid floating point value" );
        Ada.Text_Io.Skip_Line;
    end;
  end loop;
  Ada.Text_Io.Put( "You entered " );
  Ada.Float_Text_Io.Put( float_value );
  Ada.Text_Io.New_Line;
end Input_Demo;

--------
Try a few of the following cases in response to each of the prompts:
  abc
  123
  123.45

If you more control over what is accepted, I suggest you read the input into
a string, validate the input string, and then convert to the appropriate
type.

SteveD

"Ben" <cptnben@gisco.net> wrote in message
news:bf8dbe70.0112101352.20a3d257@posting.google.com...
> Hi,
>
> I am new to Ada and the instruction book I found is not really helpful
> in explaining how to handle errors of unmatching types. For example,
> one of the sample problems the book has me do it a simple calculator
> made to work with real values. Say I programmed it to work only with
> integers, yet I enter  a real number. That will cause a problem,
> right?  Is the error handling automatic in Ada, or do I need to code
> something in. So far I have been unsuccessful at finding example code
> and instructions on how to do this.
>
> Thanks,
> Ben