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A.5 The Numerics Packages
1
The library package Numerics is the parent of
several child units that provide facilities for mathematical computation.
One child, the generic package Generic_Elementary_Functions, is defined
in
A.5.1, together with nongeneric equivalents;
two others, the package Float_Random and the generic package Discrete_Random,
are defined in
A.5.2. Additional (optional)
children are defined in
Annex G, ``
Numerics''.
Static Semantics
2/1
This paragraph was deleted.
3
package Ada.Numerics is
pragma Pure(Numerics);
Argument_Error : exception;
Pi : constant :=
3.14159_26535_89793_23846_26433_83279_50288_41971_69399_37511;
e : constant :=
2.71828_18284_59045_23536_02874_71352_66249_77572_47093_69996;
end Ada.Numerics;
4
The Argument_Error exception is raised by a subprogram
in a child unit of Numerics to signal that one or more of the actual
subprogram parameters are outside the domain of the corresponding mathematical
function.
Implementation Permissions
5
The implementation may specify the values of Pi
and e to a larger number of significant digits.
5.a
Reason: 51 digits seem
more than adequate for all present computers; converted to binary, the
values given above are accurate to more than 160 bits. Nevertheless,
the permission allows implementations to accommodate unforeseen hardware
advances.
Extensions to Ada 83
5.b
Numerics and
its children were not predefined in Ada 83.
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