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-- C4A012B.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.

--*

-- OBJECTIVE:

--     CHECK THAT CONSTRAINT_ERROR IS RAISED FOR

--     A UNIVERSAL_REAL EXPRESSION IF DIVISION BY ZERO IS ATTEMPTED.

--     CHECK THAT CONSTRAINT_ERROR IS RAISED FOR

--     0.0 ** (-1) (OR ANY OTHER NEGATIVE EXPONENT VALUE).

-- HISTORY:

--     RJW 09/04/86  CREATED ORIGINAL TEST.

--     CJJ 09/04/87  ADDED PASS MESSAGE FOR RAISING NUMERIC_ERROR;

--                   MODIFIED CODE TO PREVENT COMPILER OPTIMIZING

--                   OUT THE TEST.

--     JET 12/31/87  ADDED MORE CODE TO PREVENT OPTIMIZATION.

--     MRM 03/30/93  REMOVED NUMERIC_ERROR FOR 9X COMPATIBILITY

--     JRL 02/29/96  Added code to check for value of Machine_Overflows; if

--                   False, test is inapplicable.

WITH REPORT; USE REPORT;

PROCEDURE C4A012B IS

     F : FLOAT;

     I3 : INTEGER := -3;

     SUBTYPE SINT IS INTEGER RANGE -10 .. 10;

     SI5 : CONSTANT SINT := -5;

     FUNCTION IDENT (X:FLOAT) RETURN FLOAT IS

     BEGIN

          IF EQUAL (3,3) THEN

               RETURN X;

          ELSE

               RETURN 1.0;

          END IF;

     END IDENT;

BEGIN

     TEST ( "C4A012B", "CHECK THAT CONSTRAINT_ERROR " &

                       "IS RAISED FOR " &

                       "0.0 ** (-1) (OR ANY OTHER NEGATIVE EXPONENT " &

                       "VALUE)" );

     IF FLOAT'MACHINE_OVERFLOWS = FALSE THEN

        REPORT.NOT_APPLICABLE ("Float'Machine_Overflows = False");

     ELSE

        BEGIN

             F := IDENT (0.0) ** (-1);

             FAILED ( "THE EXPRESSION '0.0 ** (-1)' DID NOT RAISE " &

                      "AN EXCEPTION" );

             IF EQUAL ( INTEGER(F), INTEGER(F) ) THEN

                  COMMENT ("SHOULDN'T BE HERE!");

             END IF;

        EXCEPTION

             WHEN CONSTRAINT_ERROR =>

                  COMMENT ("CONSTRAINT_ERROR RAISED - 1");

             WHEN OTHERS =>

                  FAILED ( "THE EXPRESSION '0.0 ** (-1)' RAISED THE " &

                           "WRONG EXCEPTION" );

        END;

        BEGIN

             F := 0.0 ** (IDENT_INT (-1));

             FAILED ( "THE EXPRESSION '0.0 ** (IDENT_INT (-1))' DID " &

                       "NOT RAISE AN EXCEPTION" );

             IF EQUAL ( INTEGER(F), INTEGER(F) ) THEN

                  COMMENT ("SHOULDN'T BE HERE!");

             END IF;

        EXCEPTION

             WHEN CONSTRAINT_ERROR =>

                  COMMENT ("CONSTRAINT_ERROR RAISED - 2");

             WHEN OTHERS =>

                  FAILED ( "THE EXPRESSION '0.0 ** (IDENT_INT (-1))' " &

                           "RAISED THE WRONG EXCEPTION" );

        END;

        BEGIN

             F := 0.0 ** (INTEGER'POS (IDENT_INT (-1)));

             FAILED ( "THE EXPRESSION '0.0 ** " &

                      "(INTEGER'POS (IDENT_INT (-1)))' DID " &

                      "NOT RAISE AN EXCEPTION" );

             IF EQUAL ( INTEGER(F), INTEGER(F) ) THEN

                  COMMENT ("SHOULDN'T BE HERE!");

             END IF;

        EXCEPTION

             WHEN CONSTRAINT_ERROR =>

                  COMMENT ("CONSTRAINT_ERROR RAISED - 3");

             WHEN OTHERS =>

                  FAILED ( "THE EXPRESSION '0.0 ** " &

                           "(INTEGER'POS (IDENT_INT (-1)))' RAISED " &

                           "THE WRONG EXCEPTION" );

        END;

        BEGIN

             F := IDENT(0.0) ** I3;

             FAILED ( "THE EXPRESSION '0.0 ** I3' DID NOT RAISE " &

                       "AN EXCEPTION" );

             IF EQUAL ( INTEGER(F), INTEGER(F) ) THEN

                  COMMENT ("SHOULDN'T BE HERE!");

             END IF;

        EXCEPTION

             WHEN CONSTRAINT_ERROR =>

                  COMMENT ("CONSTRAINT_ERROR RAISED - 4");

             WHEN OTHERS =>

                  FAILED ( "THE EXPRESSION '0.0 ** I3' RAISED THE " &

                           "WRONG EXCEPTION" );

        END;

        BEGIN

             F := 0.0 ** (IDENT_INT (I3));

             FAILED ( "THE EXPRESSION '0.0 ** (IDENT_INT (I3))' DID " &

                      "NOT RAISE AN EXCEPTION" );

             IF EQUAL ( INTEGER(F), INTEGER(F) ) THEN

                  COMMENT ("SHOULDN'T BE HERE!");

             END IF;

        EXCEPTION

             WHEN CONSTRAINT_ERROR =>

                  COMMENT ("CONSTRAINT_ERROR RAISED - 5");

             WHEN OTHERS =>

                  FAILED ( "THE EXPRESSION '0.0 ** (IDENT_INT (I3))' " &

                            "RAISED THE WRONG EXCEPTION" );

        END;

        BEGIN

             F := IDENT (0.0) ** SI5;

             FAILED ( "THE EXPRESSION '0.0 ** SI5' DID NOT RAISE " &

                       "AN EXCEPTION" );

             IF EQUAL ( INTEGER(F), INTEGER(F) ) THEN

                  COMMENT ("SHOULDN'T BE HERE!");

             END IF;

        EXCEPTION

             WHEN CONSTRAINT_ERROR =>

                  COMMENT ("CONSTRAINT_ERROR RAISED - 6");

             WHEN OTHERS =>

                  FAILED ( "THE EXPRESSION '0.0 ** SI5' RAISED THE " &

                           "WRONG EXCEPTION" );

        END;

        BEGIN

             F := 0.0 ** (IDENT_INT (SI5));

             FAILED ( "THE EXPRESSION '0.0 ** (IDENT_INT (SI5))' DID " &

                      "NOT RAISE AN EXCEPTION" );

             IF EQUAL ( INTEGER(F), INTEGER(F) ) THEN

                  COMMENT ("SHOULDN'T BE HERE!");

             END IF;

        EXCEPTION

             WHEN CONSTRAINT_ERROR =>

                  COMMENT ("CONSTRAINT_ERROR RAISED - 7");

             WHEN OTHERS =>

                  FAILED ( "THE EXPRESSION '0.0 ** (IDENT_INT (SI5))' " &

                            "RAISED THE WRONG EXCEPTION" );

        END;

     END IF;

     RESULT;

END C4A012B;