]>
Commit | Line | Data |
---|---|---|
e63b2f75 L |
1 | /* |
2 | * (C)2012 Michael Duane Rice All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions are | |
6 | * met: | |
7 | * | |
8 | * Redistributions of source code must retain the above copyright notice, this | |
9 | * list of conditions and the following disclaimer. Redistributions in binary | |
10 | * form must reproduce the above copyright notice, this list of conditions | |
11 | * and the following disclaimer in the documentation and/or other materials | |
12 | * provided with the distribution. Neither the name of the copyright holders | |
13 | * nor the names of contributors may be used to endorse or promote products | |
14 | * derived from this software without specific prior written permission. | |
15 | * | |
16 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
17 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
20 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
21 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
22 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
23 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
24 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
25 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
26 | * POSSIBILITY OF SUCH DAMAGE. | |
27 | */ | |
28 | ||
29 | /* $Id: isLeap.c 2325 2013-04-02 21:22:16Z swfltek $ */ | |
30 | ||
31 | /* | |
32 | Return 1 if 'year' is a leap year, else 0. | |
33 | */ | |
34 | ||
35 | #include <stdlib.h> | |
36 | ||
37 | unsigned char | |
38 | is_leap_year(int year) | |
39 | { | |
40 | div_t d; | |
41 | ||
42 | /* year must be divisible by 4 to be a leap year */ | |
43 | if (year & 3) | |
44 | return 0; | |
45 | ||
46 | /* If theres a remainder after division by 100, year is not divisible by 100 or 400 */ | |
47 | d = div(year, 100); | |
48 | if (d.rem) | |
49 | return 1; | |
50 | ||
51 | /* If the quotient is divisible by 4, then year is divisible by 400 */ | |
52 | if ((d.quot & 3) == 0) | |
53 | return 1; | |
54 | ||
55 | return 0; | |
56 | } |