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-- CXA5A02.A

--

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

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--*

--

-- OBJECTIVE:

--      Check that the functions Cos and Cosh provide correct results.

--

-- TEST DESCRIPTION:

--      This test examines both the version of Cos and Cosh resulting from

--      the instantiation of the Ada.Numerics.Generic_Elementary_Functions

--      with type derived from type Float, as well as the pre-instantiated

--      version of this package for type Float.

--      Prescribed results, including instances prescribed to raise

--      exceptions, are examined in the test cases.  In addition,

--      certain evaluations are performed where the actual function result

--      is compared with the expected result (within an epsilon range of

--      accuracy).

--

-- TEST FILES:

--      The following files comprise this test:

--

--         FXA5A00.A   (foundation code)

--         CXA5A02.A

--

--

-- CHANGE HISTORY:

--      09 Mar 95   SAIC    Initial prerelease version.

--      03 Apr 95   SAIC    Removed reference to derived type.

--      13 Jun 95   SAIC    Incorporated use of Dont_Optimize procedure, and

--                          use of Result_Within_Range function overloaded for

--                          FXA5A00.New_Float_Type.

--      28 Feb 97   PWB.CTA Removed checks specifying Cycle => 2.0 * Pi

--      26 Jun 98   EDS     Protected exception checks by first testing

--                          for 'Machine_Overflows.  Removed code deleted

--                          by comment.

-- CHANGE NOTE:

--      According to Ken Dritz, author of the Numerics Annex of the RM,

--      one should never specify the cycle 2.0*Pi for the trigonometric

--      functions.  In particular, if the machine number for the first

--      argument is not an exact multiple of the machine number for the

--      explicit cycle, then the specified exact results cannot be

--      reasonably expected.  The affected checks have been deleted.

--!

with Ada.Numerics.Elementary_Functions;

with Ada.Numerics.Generic_Elementary_Functions;

with FXA5A00;

with Report;

procedure CXA5A02 is

begin

   Report.Test ("CXA5A02", "Check that the functions Cos and Cosh provide " &

                           "correct results");

   Test_Block:

   declare

      use Ada.Numerics;

      use FXA5A00;

      package GEF is new Ada.Numerics.Generic_Elementary_Functions(New_Float);

      package  EF renames Ada.Numerics.Elementary_Functions;

      The_Result       : Float;

      New_Float_Result : New_Float;

      procedure Dont_Optimize_Float     is new Dont_Optimize(Float);

      procedure Dont_Optimize_New_Float is new Dont_Optimize(New_Float);

   begin

      -- Testing of Cos Function, both instantiated and pre-instantiated

      -- version.

      -- Check that no exception occurs on computing the Cos with very

      -- large (positive and negative) input values.

      begin

         New_Float_Result := GEF.Cos (New_Float(FXA5A00.Large));

         Dont_Optimize_New_Float(New_Float_Result, 1);

      exception

         when others =>

           Report.Failed("Unexpected exception on GEF.Cos with large " &

                         "positive value");

      end;

      begin

         The_Result := EF.Cos (FXA5A00.Minus_Large);

         Dont_Optimize_Float(The_Result, 2);

      exception

         when others =>

           Report.Failed("Unexpected exception on GEF.Cos with large " &

                         "negative value");

      end;

      -- Test of Cos for prescribed result at zero.

      if GEF.Cos (0.0) /= 1.0 or

          EF.Cos (0.0) /= 1.0

      then

         Report.Failed("Incorrect value returned from Cos(0.0)");

      end if;

      -- Test of Cos with expected result value between 1.0 and -1.0.

      if not (Result_Within_Range( EF.Cos(Ada.Numerics.Pi/3.0),

                                          0.500,

                                          0.001)                       and

              Result_Within_Range(GEF.Cos(0.6166), 0.816, 0.001)       and

              Result_Within_Range(GEF.Cos(0.1949), 0.981, 0.001)       and

              Result_Within_Range( EF.Cos(Ada.Numerics.Pi/2.0),

                                          0.00,

                                          0.001)                       and

              Result_Within_Range( EF.Cos(2.0*Ada.Numerics.Pi/3.0),

                                          -0.500,

                                          0.001)                       and

              Result_Within_Range(GEF.Cos(New_Float(Ada.Numerics.Pi)),

                                          -1.00,

                                           0.001))

      then

         Report.Failed("Incorrect value returned from Cos function when " &

                       "the expected result is between 1.0 and -1.0");

      end if;

      -- Testing of the Cos function with Cycle parameter.

      -- Check that Argument_Error is raised when the value of the Cycle

      -- parameter is zero.

      begin

         New_Float_Result := GEF.Cos (X => 1.0, Cycle => 0.0);

         Report.Failed("Argument_Error not raised by GEF.Cos function " &

                       "when the Cycle parameter is zero");

         Dont_Optimize_New_Float(New_Float_Result, 3);

      exception

         when Ada.Numerics.Argument_Error => null;  -- OK, expected exception.

         when others =>

            Report.Failed("Unexpected exception raised by GEF.cos function " &

                          "when the Cycle parameter is zero");

      end;

      begin

         The_Result := EF.Cos (X => 0.55, Cycle => 0.0);

         Report.Failed("Argument_Error not raised by EF.Cos function when " &

                       "the Cycle parameter is zero");

         Dont_Optimize_Float(The_Result, 4);

      exception

         when Ada.Numerics.Argument_Error => null;  -- OK, expected exception.

         when others =>

            Report.Failed("Unexpected exception raised by EF.Cos function " &

                          "when the Cycle parameter is zero");

      end;

      -- Check that Argument_Error is raised when the value of the Cycle

      -- parameter is negative.

      begin

         New_Float_Result := GEF.Cos (X => 0.45, Cycle => -2.0*Pi);

         Report.Failed("Argument_Error not raised by GEF.Cos function " &

                       "when the Cycle parameter is negative");

         Dont_Optimize_New_Float(New_Float_Result, 5);

      exception

         when Ada.Numerics.Argument_Error => null;  -- OK, expected exception.

         when others =>

            Report.Failed("Unexpected exception raised by GEF.Cos function " &

                          "when the Cycle parameter is negative");

      end;

      begin

         The_Result := EF.Cos (X => 0.10, Cycle => -Pi/2.0);

         Report.Failed("Argument_Error not raised by EF.Cos function when " &

                       "the Cycle parameter is negative");

         Dont_Optimize_Float(The_Result, 6);

      exception

         when Ada.Numerics.Argument_Error => null;  -- OK, expected exception.

         when others =>

            Report.Failed("Unexpected exception raised by EF.Cos function " &

                          "when the Cycle parameter is negative");

      end;

      -- Test of Cos with Cycle parameter for prescribed result at zero.

      if GEF.Cos (0.0, 360.0) /= 1.0 or

          EF.Cos (0.0, 360.0) /= 1.0

      then

         Report.Failed("Incorrect value returned from Cos function with " &

                       "cycle parameter for a zero input parameter value");

      end if;

      -- Tests of Cos function with specified Cycle, using various input

      -- parameter values for prescribed results.

      if GEF.Cos(0.0,   360.0) /=  1.0 or

          EF.Cos(360.0, 360.0) /=  1.0 or

         GEF.Cos(90.0,  360.0) /=  0.0 or

          EF.Cos(270.0, 360.0) /=  0.0 or

         GEF.Cos(180.0, 360.0) /= -1.0 or

          EF.Cos(540.0, 360.0) /= -1.0

      then

         Report.Failed("Incorrect result from the Cos function with " &

                       "specified cycle for prescribed results");

      end if;

      -- Testing of Cosh Function, both instantiated and pre-instantiated

      -- version.

      -- Test for Constraint_Error on parameter with large positive magnitude.

      begin

         if New_Float'Machine_Overflows then

            New_Float_Result := GEF.Cosh (New_Float(FXA5A00.Large));

            Report.Failed("Constraint_Error not raised when the GEF.Cosh " &

                          "function is provided a parameter with a large " &

                          "positive value");

            Dont_Optimize_New_Float(New_Float_Result, 9);

         end if;

      exception

         when Constraint_Error => null;  -- OK, expected exception.

         when others           =>

            Report.Failed("Constraint_Error not raised when the GEF.Cosh " &

                          "function is provided a parameter with a large " &

                          "positive value");

      end;

      -- Test for Constraint_Error on parameter with large negative magnitude.

      begin

         if Float'Machine_Overflows then

            The_Result := EF.Cosh (FXA5A00.Minus_Large);

            Report.Failed("Constraint_Error not raised when the EF.Cosh " &

                          "function is provided a parameter with a "      &

                          "large negative value");

            Dont_Optimize_Float(The_Result, 10);

         end if;

      exception

         when Constraint_Error => null;  -- OK, expected exception.

         when others           =>

            Report.Failed("Constraint_Error not raised when the EF.Cosh " &

                          "function is provided a parameter with a "      &

                          "large negative value");

      end;

      -- Test that no exception occurs when the Cosh function is provided a

      -- very small positive or negative value.

      begin

         New_Float_Result := GEF.Cosh (New_Float(FXA5A00.Small));

         Dont_Optimize_New_Float(New_Float_Result, 11);

      exception

         when others =>

            Report.Failed("Unexpected exception on GEF.Cosh with a very" &

                          "small positive value");

      end;

      begin

         The_Result := EF.Cosh (-FXA5A00.Small);

         Dont_Optimize_Float(The_Result, 12);

      exception

         when others =>

            Report.Failed("Unexpected exception on EF.Cosh with a very" &

                          "small negative value");

      end;

      -- Test for prescribed 1.0 result of Function Cosh with 0.0 parameter.

      if GEF.Cosh (0.0) /= 1.0 or

          EF.Cosh (0.0) /= 1.0

      then

         Report.Failed("Incorrect value returned from Cosh(0.0)");

      end if;

      -- Test of Cosh function with various input parameters.

      if not FXA5A00.Result_Within_Range(GEF.Cosh(0.24), 1.029, 0.001) or

         not FXA5A00.Result_Within_Range( EF.Cosh(0.59), 1.179, 0.001) or

         not FXA5A00.Result_Within_Range(GEF.Cosh(1.06), 1.616, 0.001) or

         not FXA5A00.Result_Within_Range( EF.Cosh(1.50), 2.352, 0.001) or

         not FXA5A00.Result_Within_Range(GEF.Cosh(1.84), 3.228, 0.001) or

         not FXA5A00.Result_Within_Range( EF.Cosh(3.40), 14.99, 0.01)

      then

         Report.Failed("Incorrect result from Cosh function with " &

                       "various input parameters");

      end if;

   exception

      when others => Report.Failed ("Exception raised in Test_Block");

   end Test_Block;

   Report.Result;

end CXA5A02;