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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
{extensions to Ada 83}
Numerics and its children were not predefined in
Ada 83.
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