Ada Reference Manual (Ada 2022)
F.2 The Package Decimal
Static Semantics
The library package Decimal has the following declaration:
package Ada.Decimal
with Pure is
with Pure is
Max_Scale : constant := implementation-defined;
Min_Scale : constant := implementation-defined;
Min_Scale : constant := implementation-defined;
Min_Delta : constant := 10.0**(-Max_Scale);
Max_Delta : constant := 10.0**(-Min_Scale);
Max_Delta : constant := 10.0**(-Min_Scale);
Max_Decimal_Digits : constant := implementation-defined;
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;
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;
end Ada.Decimal;
Max_Scale is the largest N such that 10.0**(–N) is allowed as a decimal type's delta. Its type is universal_integer.
Min_Scale is the smallest N such that 10.0**(–N) is allowed as a decimal type's delta. Its type is universal_integer.
Min_Delta is the smallest value allowed for delta in a decimal_fixed_point_definition. Its type is universal_real.
Max_Delta is the largest value allowed for delta in a decimal_fixed_point_definition. Its type is universal_real.
Max_Decimal_Digits is the largest value allowed for digits in a decimal_fixed_point_definition. Its type is universal_integer.
Static Semantics
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
Decimal.Max_Decimal_Digits shall be at least 18.
Decimal.Max_Scale shall be at least 18.
Decimal.Min_Scale shall be at most 0.
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.
