[task #16070] Add mathematical and physical constants in the arithmetic library

[Pedram Ashofteh Ardakani]

URL:
  <https://savannah.gnu.org/task/?16070>

                 Summary: Add mathematical and physical constants in the
arithmetic library
                 Project: GNU Astronomy Utilities
            Submitted by: pedram
            Submitted on: Thu 11 Nov 2021 01:48:00 PM UTC
         Should Start On: Thu 11 Nov 2021 12:00:00 AM UTC
   Should be Finished on: Thu 11 Nov 2021 12:00:00 AM UTC
                Category: Arithmetic
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

It would be nice if Arithmetic comprehended mathematical/physical constants
such as 'pi' in the user-given operands.

To achieve this, Mohammad suggests: we can define 'pi' as an operator with no
operand. This operator will just put the number 3.14.... on top of the stack
of operands! In fact, if implemented properly, we can define a whole class of
"constant" operators for this purpose, so as more physical/mathematical
constants become necessary, we can easily add them.

Please note, mathematical constants like the number 'pi' is already in the
'math.h' header of the C library, as well as the math section of the  Gnuastro
dependency: GNU Scientific Library [1]. Also, the most basic
physical/astronomical constants are present as macros in the GNU Scientific
Library [2].

[1] https://www.gnu.org/software/gsl/doc/html/math.html
[2] https://www.gnu.org/software/gsl/doc/html/const.html




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