[Octave-bug-tracker] [bug #61812] Math constants (e.g. M_PI) are not part of C/C++ standard

[Rik]

Follow-up Comment #22, bug #61812 (project octave):

@jwe: There could be other constants besides M_PI.  In data.cc, for example,
wee use M_E.


#if defined (M_E)
  double e_val = M_E;
#else
  double e_val = exp (1.0);
#endif


In actual header files, though, only oct-cmplx.h uses a 'M_' constant and that
constant is M_PI.

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