Yurttas/PL/IL/Ada-95/F/02/03/01/error handling 12.adb

 1--
 2-- Copyright(C) 1998
 3-- All Rights Reserved. Salih Yurttas, ZCubes, BitsOfCode Software Systems, Inc..
 4--
 5-- Permission to use, copy, modify, and distribute this
 6-- software and its documentation for EDUCATIONAL purposes
 7-- and without fee is hereby granted provided that this
 8-- copyright notice appears in all copies.
 9--
10 
11-- date   : January 1, 1998.
12-- author : Salih Yurttas.
13
14-- purpose : Error handling by exceptions.
15
16-- error_handling_12.adb
17
18
19with Ada.Text_IO;
20use Ada.Text_IO;
21 
22with Error_Handling_02_P;
23use Error_Handling_02_P;
24
25procedure Error_Handling_12 is 
26
27  Decision : Boolean := True;
28
29begin
30
31  while Decision
32  loop
33    begin
34      case Decision is
35      when False => PA;
36                    Put_Line("One,");
37      when True  => PB;
38                    Put_Line("Two,");
39                    Decision := not Decision;
40      end case;
41    exception
42      when others => Put_Line(" done.");
43    end;
44  end loop;
45
46  Put_Line(" First.");
47
48  while not Decision
49  loop
50    begin
51      case Decision is
52      when True  => PB;
53                    Put_Line("Three,");
54      when False => PA;
55                    Put_Line("Four,");
56                    Decision := not Decision;
57      end case;
58    exception
59      when others => Put_Line(" done.");
60    end;
61  end loop;
62
63  Put_Line(" Last.");
64
65end Error_Handling_12;