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[project @ 2006-01-13 20:05:51 by jwe]
author jwe
date Fri, 13 Jan 2006 20:05:51 +0000
parents
children 34f96dd5441b
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1 ## Copyright (C) 1996, 1997 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 2, or (at your option)
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8 ## 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, write to the Free
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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18 ## 02110-1301, USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} is_leap_year (@var{year})
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22 ## Return 1 if the given year is a leap year and 0 otherwise. If no
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23 ## arguments are provided, @code{is_leap_year} will use the current year.
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24 ## For example,
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25 ##
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26 ## @example
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27 ## @group
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28 ## is_leap_year (2000)
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29 ## @result{} 1
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30 ## @end group
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31 ## @end example
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32 ## @end deftypefn
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33
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34 ## Author: jwe
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35
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36 function retval = is_leap_year (year)
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37
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38 if (nargin > 1)
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39 usage ("is_leap_year (year)");
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40 endif
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41
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42 if (nargin == 0)
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43 t = clock ();
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44 year = t (1);
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45 endif
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46
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47 retval = ((rem (year, 4) == 0 & rem (year, 100) != 0) ...
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48 | rem (year, 400) == 0);
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49
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50 endfunction