Re: how to check if a string variable contains a number or string?

[sk <noname@myob.com>]

Hi, 

1) Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>
> Try reading the number from the string using Ada.Text_IO.*.


2) "David C. Hoos" <david.c.hoos.sr@ada95.com>
> If that's OK, then if calling Long_Float'Value doesn't 
> raise Constraint_Error, then the string is a valid 
> decimal representation of a number.

OR, 

3) Tokenize the string separating on spaces and use
the Ada.Characters.Handling package ...

   function Is_Control           (Item : in Character) return Boolean;
   function Is_Graphic           (Item : in Character) return Boolean;
   function Is_Letter            (Item : in Character) return Boolean;
   function Is_Lower             (Item : in Character) return Boolean;
   function Is_Upper             (Item : in Character) return Boolean;
   function Is_Basic             (Item : in Character) return Boolean;
   function Is_Digit             (Item : in Character) return Boolean;
   function Is_Decimal_Digit     (Item : in Character) return Boolean
                                                          renames
Is_Digit;
   function Is_Hexadecimal_Digit (Item : in Character) return Boolean;
   function Is_Alphanumeric      (Item : in Character) return Boolean;
   function Is_Special           (Item : in Character) return Boolean;

... yes, time consuming, boring and not "sexy" but better,
IMO, than using exception routines for predictable error
circumstances.

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