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update copyright notices
author John W. Eaton <jwe@octave.org>
date Fri, 14 Jan 2011 05:47:45 -0500
parents 0d9640d755b1
children d490ca8ab1a5
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John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1996-2011 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 ()
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21 ## @deftypefnx {Function File} {} is_leap_year (@var{year})
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22 ## Return true if the given year is a leap year and false otherwise. If no
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23 ## year is 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 print_usage ();
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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
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51
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52 %!assert((is_leap_year (2000) == 1 && is_leap_year (1976) == 1
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53 %! && is_leap_year (1000) == 0 && is_leap_year (1800) == 0
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54 %! && is_leap_year (1600) == 1));
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55
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56 %!error is_leap_year (1, 2);
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