The Package Decimal
Author: JTC1/SC22/WG9/ARG, by Randall Brukardt, ARG Editor

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# F.2 The Package Decimal

#### Static Semantics

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The library package Decimal has the following declaration:
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`package Ada.Decimal is
pragma Pure(Decimal);`
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`Max_Scale : constant := implementation-defined;
Min_Scale : constant := implementation-defined;`
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`Min_Delta : constant := 10.0**(-Max_Scale);
Max_Delta : constant := 10.0**(-Min_Scale);`
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`Max_Decimal_Digits : constant := implementation-defined;`
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`generic
type Dividend_Type is delta <> digits <>;
type Divisor_Type is delta <> digits <>;
type Quotient_Type is delta <> digits <>;
type Remainder_Type is delta <> digits <>;
procedure Divide (Dividend : in Dividend_Type;
Divisor : in Divisor_Type;
Quotient : out Quotient_Type;
Remainder : out Remainder_Type);
pragma Convention(Intrinsic, Divide);`
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`end Ada.Decimal;`
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Max_Scale is the largest N such that 10.0**(-N) is allowed as a decimal type's delta. Its type is universal_integer.
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Min_Scale is the smallest N such that 10.0**(-N) is allowed as a decimal type's delta. Its type is universal_integer.
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Min_Delta is the smallest value allowed for delta in a decimal_fixed_point_definition. Its type is universal_real.
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Max_Delta is the largest value allowed for delta in a decimal_fixed_point_definition. Its type is universal_real.
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Max_Decimal_Digits is the largest value allowed for digits in a decimal_fixed_point_definition. Its type is universal_integer.

#### Static Semantics

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The effect of Divide is as follows. The value of Quotient is Quotient_Type(Dividend/Divisor). The value of Remainder is Remainder_Type(Intermediate), where Intermediate is the difference between Dividend and the product of Divisor and Quotient; this result is computed exactly.

#### Implementation Requirements

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Decimal.Max_Decimal_Digits shall be at least 18.
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Decimal.Max_Scale shall be at least 18.
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Decimal.Min_Scale shall be at most 0.
NOTES
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1 The effect of division yielding a quotient with control over rounding versus truncation is obtained by applying either the function attribute Quotient_Type'Round or the conversion Quotient_Type to the expression Dividend/Divisor.

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