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is_leap_year.m
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1996-09-28
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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