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-- FC51A00.A

--

--                             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.

--*

--

-- FOUNDATION DESCRIPTION:

--      This foundation defines a fraction type abstraction. Fractions are

--      implemented as records with two scalar components: a numerator

--      of type integer and a denominator of type positive. Fractions are

--      created via an overloaded "/" operator.

--

-- CHANGE HISTORY:

--      06 Dec 94   SAIC    ACVC 2.0

--

--!

package FC51A00 is   -- Fraction type abstraction.

   type Fraction_Type is private;

   -- Create a fraction object by integer division.

   function "/" (Left, Right : Integer) return Fraction_Type;

   -- Change the sign of a fraction.

   function "-" (Frac : Fraction_Type) return Fraction_Type;

   -- Return value of numerator as integer.

   function Numerator (Frac : Fraction_Type) return Integer;

   -- Return value of denominator as integer.

   function Denominator (Frac : Fraction_Type) return Integer;

   -- ... Other operations on fraction types.

private

   type Fraction_Type is record

      Numerator   : Integer;

      Denominator : Positive;

   end record;

end FC51A00;

     --==================================================================--

package body FC51A00 is

   function "/" (Left, Right : Integer) return Fraction_Type is

      Result : Fraction_Type;

   begin

      Result.Numerator   := Left;

      Result.Denominator := Right;

      return Result;

   end "/";

   function "-" (Frac : Fraction_Type) return Fraction_Type is

      Result : Fraction_Type := Frac;

   begin

      Result.Numerator := -(Result.Numerator);

      return Result;

   end "-";

   function Numerator (Frac : Fraction_Type) return Integer is

   begin

      return (Frac.Numerator);

   end Numerator;

   function Denominator (Frac : Fraction_Type) return Integer is

   begin

      return (Frac.Denominator);

   end Denominator;

end FC51A00;