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From: Jerry <lanceboyle@qwest.net>
Newsgroups: comp.lang.ada
Subject: Weird string I/O problem
Date: Tue, 25 Nov 2008 21:52:02 -0800 (PST)
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Date: 2008-11-25T21:52:02-08:00
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The following program misbehaves if the line

    Get(A_Float); -- PROBLEMATIC LINE

is present; the call to Get_Line is made but there is no opportunity
for the user to enter a string--the program continues (I suppose) as
though the user entered a line terminator, causing the following
output:

  Enter a float: 12.3
  Enter a string: Hello from Get_Line.
  Your string was
  It was 0 long.

However, if the problematic line is commented out, the following
occurs:

  Enter a float: Enter a string: Hello from Get_Line.
  bla bla
  Your string was bla bla
  It was 7 long.

Here is the program:



with
    Ada.Text_IO,
    Ada.Float_Text_IO,
    Ada.Strings.Unbounded;
use
    Ada.Text_IO,
    Ada.Float_Text_IO,
    Ada.Strings.Unbounded;

procedure temp1 is

    -- Crude Get_Line for unbounded strings.
    procedure Get_Line(An_Unbounded_String : out Unbounded_String) is
        Max_Length : Integer := 256;
        A_String : String(1 .. Max_Length);
        Length : Integer;
    begin
        Put_Line("Hello from Get_Line.");
        Get_Line(A_String, Length);
        An_Unbounded_String := To_Unbounded_String(A_String(1 ..
Length));
    end Get_Line;

    UBS : Unbounded_String;
    A_Float : Float;

begin
    Put("Enter a float: ");
    Get(A_Float); -- PROBLEMATIC LINE
    Put("Enter a string: ");
    Get_Line(UBS);
    Put_Line("Your string was " & To_String(UBS));
    Put_Line("It was" & Length(UBS)'img & " long.");
end temp1;


What is going on here? I am running GNAT 4.3 on OS X 10.4.

Jerry