c45523a.ada

来自「linux下编程用 编译软件」· ADA 代码 · 共 112 行

-- C45523A.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:
--     FOR FLOATING POINT TYPES, IF MACHINE_OVERFLOWS IS TRUE AND
--     EITHER THE RESULT OF MULTIPLICATION LIES OUTSIDE THE RANGE OF THE
--     BASE TYPE, OR AN ATTEMPT IS MADE TO DIVIDE BY ZERO, THEN
--     CONSTRAINT_ERROR IS RAISED.  THIS TESTS
--     DIGITS 5.


-- *** NOTE: This test has been modified since ACVC version 1.11 to    -- 9X
-- ***       remove incompatibilities associated with the transition   -- 9X
-- ***       to Ada 9X.                                                -- 9X
-- ***                                                                 -- 9X

-- HISTORY:
--     BCB 02/09/88  CREATED ORIGINAL TEST.
--     MRM 03/30/93  REMOVED NUMERIC_ERROR FOR 9X COMPATIBILITY
--     KAS 11/14/95  DELETED USAGE OF 'SAFE_LARGE
--     KAS 11/30/95  GOT IT RIGHT THIS TIME

WITH REPORT; USE REPORT;

PROCEDURE C45523A IS

     TYPE FLT IS DIGITS 5;

     F : FLT;

     FUNCTION IDENT_FLT(X : FLT) RETURN FLT IS
     BEGIN
          IF EQUAL(3,3) THEN
               RETURN X;
          ELSE
               RETURN 0.0;
          END IF;
     END IDENT_FLT;

     FUNCTION EQUAL_FLT(ONE, TWO : FLT) RETURN BOOLEAN IS
     BEGIN
          RETURN ONE = TWO * FLT (IDENT_INT(1));
     END EQUAL_FLT;

BEGIN
     TEST ("C45523A", "FOR FLOATING POINT TYPES, IF MACHINE_" &
                      "OVERFLOWS IS TRUE AND EITHER THE RESULT OF " &
                      "MULTIPLICATION LIES OUTSIDE THE RANGE OF THE " &
                      "BASE TYPE, OR AN ATTEMPT IS MADE TO DIVIDE BY " &
                      "ZERO, THEN CONSTRAINT_ERROR IS RAISED." &
                      "THIS TESTS DIGITS 5");


     IF FLT'MACHINE_OVERFLOWS THEN
          BEGIN
               F := (FLT'BASE'LAST) * IDENT_FLT (2.0);
               FAILED ("CONSTRAINT_ERROR WAS NOT RAISED FOR MULTIPLICATION");
               IF EQUAL_FLT(F,F**IDENT_INT(1)) THEN
                    COMMENT ("DON'T OPTIMIZE F");
               END IF;
          EXCEPTION
               WHEN CONSTRAINT_ERROR =>
                    COMMENT ("CONSTRAINT_ERROR WAS RAISED FOR " &
                             "MULTIPLICATION");
               WHEN OTHERS =>
                    FAILED ("AN EXCEPTION OTHER THAN " &
                            "CONSTRAINT_ERROR WAS RAISED FOR " &
                            "MULTIPLICATION");
          END;
          BEGIN
               F := (FLT'LAST) / IDENT_FLT (0.0);
               FAILED ("CONSTRAINT_ERROR WAS NOT RAISED FOR DIVISION BY ZERO");
               IF EQUAL_FLT(F,F**IDENT_INT(1)) THEN
                    COMMENT ("DON'T OPTIMIZE F");
               END IF;
          EXCEPTION
               WHEN CONSTRAINT_ERROR =>
                    COMMENT ("CONSTRAINT_ERROR WAS RAISED FOR " &
                             "DIVISION BY ZERO");
               WHEN OTHERS =>
                    FAILED ("AN EXCEPTION OTHER THAN CONSTRAINT_ERROR " &
                            "WAS RAISED FOR DIVISION BY ZERO");
          END;
     ELSE
          NOT_APPLICABLE ("THIS TEST IS NOT APPLICABLE DUE TO " &
                          "MACHINE_OVERFLOWS BEING FALSE");
     END IF;

     RESULT;
END C45523A;