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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, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, 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 |
