Ada Reference Manual (Ada 2022) — Legal Information

# F.2 The Package Decimal

#### Static Semantics

1
The library package Decimal has the following declaration:
2/5
package Ada.Decimal
with Pure is
3
Max_Scale : constant := implementation-defined;
Min_Scale : constant := implementation-defined;
4
Min_Delta : constant := 10.0**(-Max_Scale);
Max_Delta : constant := 10.0**(-Min_Scale);
5
Max_Decimal_Digits : constant := implementation-defined;
6/3
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)
with Convention => Intrinsic;
7
end Ada.Decimal;
8
Max_Scale is the largest N such that 10.0**(–N) is allowed as a decimal type's delta. Its type is universal_integer.
9
Min_Scale is the smallest N such that 10.0**(–N) is allowed as a decimal type's delta. Its type is universal_integer.
10
Min_Delta is the smallest value allowed for delta in a decimal_fixed_point_definition. Its type is universal_real.
11
Max_Delta is the largest value allowed for delta in a decimal_fixed_point_definition. Its type is universal_real.
12
Max_Decimal_Digits is the largest value allowed for digits in a decimal_fixed_point_definition. Its type is universal_integer.

#### Static Semantics

13
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

14
Decimal.Max_Decimal_Digits shall be at least 18.
15
Decimal.Max_Scale shall be at least 18.
16
Decimal.Min_Scale shall be at most 0.
17
NOTE 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.

Ada 2005 and 2012 Editions sponsored in part by Ada-Europe