|
2303
|
1 ### Copyright (C) 1996 John W. Eaton |
|
|
2 ### |
|
|
3 ### This file is part of Octave. |
|
|
4 ### |
|
|
5 ### Octave is free software; you can redistribute it and/or modify it |
|
|
6 ### under the terms of the GNU General Public License as published by |
|
|
7 ### the Free Software Foundation; either version 2, or (at your option) |
|
|
8 ### any later version. |
|
|
9 ### |
|
|
10 ### Octave is distributed in the hope that it will be useful, but |
|
|
11 ### WITHOUT ANY WARRANTY; without even the implied warranty of |
|
|
12 ### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
|
13 ### General Public License for more details. |
|
|
14 ### |
|
|
15 ### You should have received a copy of the GNU General Public License |
|
|
16 ### along with Octave; see the file COPYING. If not, write to the Free |
|
|
17 ### Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
|
|
18 ### 02111-1307, USA. |
|
901
|
19 |
|
2311
|
20 ## usage: is_leap_year (year) |
|
|
21 ## |
|
|
22 ## Return 1 if the given year is a leap year; otherwise, return 0. |
|
|
23 ## With no arguments, use the current year. |
|
901
|
24 |
|
2311
|
25 function retval = is_leap_year (year) |
|
901
|
26 |
|
|
27 if (nargin > 1) |
|
|
28 usage ("is_leap_year (year)"); |
|
|
29 endif |
|
|
30 |
|
|
31 if (nargin == 0) |
|
|
32 t = clock (); |
|
|
33 year = t (1); |
|
|
34 endif |
|
|
35 |
|
1307
|
36 retval = ((rem (year, 4) == 0 & rem (year, 100) != 0) ... |
|
|
37 | rem (year, 400) == 0); |
|
901
|
38 |
|
|
39 endfunction |
