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[project @ 2007-10-12 21:27:11 by jwe]
author jwe
date Fri, 12 Oct 2007 21:27:37 +0000
parents 93c65f2a5668
children 83a8781b529d
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1 ## Copyright (C) 1996, 1997, 2006, 2007 John W. Eaton
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} is_leap_year (@var{year})
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21 ## Return 1 if the given year is a leap year and 0 otherwise. If no
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22 ## arguments are provided, @code{is_leap_year} will use the current year.
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23 ## For example,
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24 ##
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25 ## @example
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26 ## @group
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27 ## is_leap_year (2000)
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28 ## @result{} 1
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29 ## @end group
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30 ## @end example
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31 ## @end deftypefn
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32
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33 ## Author: jwe
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34
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35 function retval = is_leap_year (year)
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36
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37 if (nargin > 1)
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38 print_usage ();
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39 endif
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40
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41 if (nargin == 0)
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42 t = clock ();
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43 year = t (1);
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44 endif
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45
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46 retval = ((rem (year, 4) == 0 & rem (year, 100) != 0) ...
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47 | rem (year, 400) == 0);
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48
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49 endfunction