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From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: Ada vs C++ for numeric IO (integers)
Date: 1996/07/22
Message-ID: <dewar.838093086@schonberg>#1/1
X-Deja-AN: 169789248
references: <nhn30scxml.fsf@paralysys> <31F42BF0.6B62@mich.com>
organization: Courant Institute of Mathematical Sciences
newsgroups: comp.lang.ada
Date: 1996-07-22T00:00:00+00:00
List-Id: <comp.lang.ada>


Tom Zagotta said:

None of the languages I've ever used have provided "bullet-proof" I/O
functions that get user input; I have always written them myself.  An example
would be a function with the following signature:

  int ReadInteger (const char* Prompt, int Min, int Max)
  {
    // your code here
  }

This function might write out the prompt, read a number from the user, make sure
it's in range, and return the integer when a valid number is typed.



I don't see how that is different from what you would get in Ada from:

  type Input_Integer is range Min .. Max;
  package My_Input is new Ada.Text_IO.Integer_IO (Input_Integer);
  ...
  Put_Line (Prompt);
  My_Input.Get (My_Input_Integer); -- My_Input_Integer is type Input_Integer

then if you want to trap invalid input, catch the exception Data_Error.