Ada Programming/Libraries/Ada.Numerics

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package Ada.Numerics is
   pragma Pure (Numerics);
   Argument_Error : exception;
   Pi : constant :=
         3.14159_26535_89793_23846_26433_83279_50288_41971_69399_37511;
   π  : constant := Pi;
   e  : constant :=
         2.71828_18284_59045_23536_02874_71352_66249_77572_47093_69996;
end Ada.Numerics;

π: This language feature is only available from Ada 2005 on.

See also

Wikibook

Ada Reference Manual

Ada 95

A.5: The Numerics Packages (Annotated)

Ada 2005

A.5: The Numerics Packages (Annotated)

Ada Issues

AI95-00388-01 Add Greek pi to Ada.Numerics

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