Re: A Calendar app on C

[wwp <subscript@free.fr>]

Hello John,


On Wed, 02 Jun 2004 05:18:57 -0400 "John T. Williams" <jowillia@vt.edu> wrote:

> isn't there some rule about if the year is year%100=0  then is has to
> also be yea%400 to be a leap year?   

Yes there is! Google would report many pages around this.
According to http://www.mitre.org/tech/cots/LEAPCALC.html:

             if (year mod 4 != 0)
                 {use 28 for days in February}
             else if  (year mod 400 == 0)
                 {use 29 for days in February}
             else if (year mod 100 == 0)
                 {use 28 for days in February}
             else
                 {use 29 for days in February}


Regards,

> On Wed, 2004-06-02 at 03:17, Christian Beckel wrote:
> > oops, I forgot to test if there is a leap or not, the first line should be:
> > 
> > if (i == 2)
> > 	days = (i % 4 != 0) ? 28 : 29;
> > 
> > 
> > > Hi,
> > >
> > > there are several possibilities to compute the number of days in a month or
> > > if there is a leap or not.
> > >
> > > if (i == 2)
> > > 	days = 28;
> > > else
> > > 	days = 31 - ( (i != 4 || i != 6 || i != 9 || i != 11) ? 1 : 0 );
> > >
> > > I think there is no simpler way, because the numbers of months are
> > > unregular.
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-- 
wwp