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--  C55B04A.ADA

--                             Grant of Unlimited Rights

--

--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,

--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 

--     unlimited rights in the software and documentation contained herein.

--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making 

--     this public release, the Government intends to confer upon all 

--     recipients unlimited rights  equal to those held by the Government.  

--     These rights include rights to use, duplicate, release or disclose the 

--     released technical data and computer software in whole or in part, in 

--     any manner and for any purpose whatsoever, and to have or permit others 

--     to do so.

--

--                                    DISCLAIMER

--

--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR

--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 

--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE

--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 

--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A

--     PARTICULAR PURPOSE OF SAID MATERIAL.

--*

-- CHECK THAT A LOOP IS NOT ENTERED IF THE LOWER BOUND OF THE DISCRETE

--   RANGE IS GREATER THAN THE UPPER BOUND, WHETHER REVERSE IS PRESENT

--   OR NOT.

-- CHECK THAT LOOP BOUNDS ARE EVALUATED ONLY ONCE, UPON ENTRY TO 

--   THE LOOP.

-- DAS  01/12/81

-- SPS 3/2/83

-- JBG 8/21/83

WITH REPORT;

PROCEDURE C55B04A IS

     USE REPORT;

     C10 : CONSTANT INTEGER := 10;

     I10 : INTEGER;

BEGIN

     TEST ( "C55B04A", "CHECK OPERATION OF A FOR LOOP OVER A NULL " &

                       "DISCRETE RANGE" );

     -- NOTE: EXIT STATEMENTS ARE INCLUDED TO AID IN RECOVERY FROM

     --   TEST FAILURE.

     -- SUBTESTS INVOLVING STATIC BOUNDS:

     FOR I IN 10..1 LOOP

          FAILED ( "LOOPING OVER NULL RANGE 10..1" );

          EXIT;

     END LOOP;

     FOR I IN REVERSE INTEGER RANGE -1..-10 LOOP

          FAILED ( "LOOPING OVER NULL RANGE -1..-10" );

          EXIT;

     END LOOP;

     FOR I IN (C10 + 3)..(-3 * C10 + 27) LOOP     -- 13..-3

          FAILED ("LOOPING OVER NULL RANGE (C10 + 3)..(-3 * C10 + 27)");

          EXIT;

     END LOOP;

     -- SUBTESTS INVOLVING DYNAMIC BOUNDS:

     I10 := IDENT_INT(10);

     FOR I IN REVERSE I10..(I10-1) LOOP           -- 10..9

          FAILED ( "LOOPING OVER NULL RANGE I10..(I10-1)");

          EXIT;

     END LOOP;

     FOR I IN (C10 - I10)..(I10 - 11) LOOP        -- 0..-1

          FAILED ( "LOOPING OVER NULL RANGE (C10 - I10)..(I10 - 11)" );

          EXIT;

     END LOOP;

     -- SUBTEST OF BOUNDS EVALUTION ONLY AT ENTRY:

     FOR I IN 1..I10 LOOP

          I10 := I10 - 1;

     END LOOP;

     IF (I10 /= 0) THEN

          FAILED ( "LOOP BOUNDS NOT FIXED AT LOOP ENTRY" );

     END IF;

     RESULT;

END C55B04A;