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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;
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