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- # Copyright (C) 1994, 1995 John W. Eaton
- #
- # This file is part of Octave.
- #
- # Octave is free software; you can redistribute it and/or modify it
- # under the terms of the GNU General Public License as published by the
- # Free Software Foundation; either version 2, or (at your option) any
- # later version.
- #
- # Octave is distributed in the hope that it will be useful, but WITHOUT
- # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- # for more details.
- #
- # You should have received a copy of the GNU General Public License
- # along with Octave; see the file COPYING. If not, write to the Free
- # Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- function retval = is_leap_year (year)
-
- # usage: is_leap_year (year)
- #
- # Return 1 if the given year is a leap year; otherwise, return 0.
- # With no arguments, use the current year.
-
- if (nargin > 1)
- usage ("is_leap_year (year)");
- endif
-
- if (nargin == 0)
- t = clock ();
- year = t (1);
- endif
-
- retval = ((rem (year, 4) == 0 && rem (year, 100) != 0) ...
- || rem (year, 400) == 0);
-
- endfunction
-