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1 -- FC51A00.A
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2 --
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3 -- Grant of Unlimited Rights
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4 --
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5 -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
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6 -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained
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7 -- unlimited rights in the software and documentation contained herein.
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8 -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making
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9 -- this public release, the Government intends to confer upon all
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10 -- recipients unlimited rights equal to those held by the Government.
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11 -- These rights include rights to use, duplicate, release or disclose the
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12 -- released technical data and computer software in whole or in part, in
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13 -- any manner and for any purpose whatsoever, and to have or permit others
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14 -- to do so.
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15 --
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16 -- DISCLAIMER
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17 --
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18 -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
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19 -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED
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20 -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
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21 -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE
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22 -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
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23 -- PARTICULAR PURPOSE OF SAID MATERIAL.
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24 --*
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25 --
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26 -- FOUNDATION DESCRIPTION:
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27 -- This foundation defines a fraction type abstraction. Fractions are
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28 -- implemented as records with two scalar components: a numerator
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29 -- of type integer and a denominator of type positive. Fractions are
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30 -- created via an overloaded "/" operator.
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31 --
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32 -- CHANGE HISTORY:
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33 -- 06 Dec 94 SAIC ACVC 2.0
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34 --
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35 --!
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36
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37 package FC51A00 is -- Fraction type abstraction.
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38
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39 type Fraction_Type is private;
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40
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41 -- Create a fraction object by integer division.
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42 function "/" (Left, Right : Integer) return Fraction_Type;
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43
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44 -- Change the sign of a fraction.
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45 function "-" (Frac : Fraction_Type) return Fraction_Type;
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46
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47 -- Return value of numerator as integer.
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48 function Numerator (Frac : Fraction_Type) return Integer;
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49
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50 -- Return value of denominator as integer.
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51 function Denominator (Frac : Fraction_Type) return Integer;
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52
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53 -- ... Other operations on fraction types.
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54
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55 private
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56
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57 type Fraction_Type is record
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58 Numerator : Integer;
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59 Denominator : Positive;
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60 end record;
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61
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62 end FC51A00;
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63
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64
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65 --==================================================================--
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66
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67
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68 package body FC51A00 is
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69
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70 function "/" (Left, Right : Integer) return Fraction_Type is
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71 Result : Fraction_Type;
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72 begin
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73 Result.Numerator := Left;
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74 Result.Denominator := Right;
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75 return Result;
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76 end "/";
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77
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78
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79 function "-" (Frac : Fraction_Type) return Fraction_Type is
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80 Result : Fraction_Type := Frac;
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81 begin
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82 Result.Numerator := -(Result.Numerator);
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83 return Result;
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84 end "-";
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85
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86
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87 function Numerator (Frac : Fraction_Type) return Integer is
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88 begin
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89 return (Frac.Numerator);
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90 end Numerator;
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91
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92
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93 function Denominator (Frac : Fraction_Type) return Integer is
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94 begin
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95 return (Frac.Denominator);
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96 end Denominator;
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97
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98
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99 end FC51A00;
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