A tiny New Year's programming challenge

[Dieter]

(01-07-2015 08:19 AM)Werner Wrote:  Dieter: what's wrong with this? My first ever WP34S try! And no fiddling with flags.

There's nothing wrong with it – it works just as well. Your routine checks if the year starts or ends on a Thursday. Which is equivalent to testing if 2 Feb is a Monday OR 2 Feb of the next year is a Tuesday. Your program evaluates this as

    (weekday(2.2.yyyy) – 1)  *  (weekday(2.2.yyyy+1) – 2)

After omitting the initial CF.01 in my routine, both of our versions require 19 steps. Using NOT instead of SIGN +/– is a good idea – it will save another step. ;-)

I should add that I also wanted to use as few calls to date routines as possible in order to speed up the program for calculators that do not offer such functions, so that a single call of WDAY would be preferred. But for such calculators maybe a completely different approach would make more sense.

Thank you for your suggestion!

Dieter