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The index page for all Programs on the site?

The DFF Play CD?

Zipped file DFF Play contains  executable version of about  75 of the 200+ programs from the site, mostly those I particularly liked or thought would be of widest interest for non-programmers.  The file is rather large, about 20mb..

Anything else?




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Not a programmer (yet)?

 That's OK -  the executable version for any puzzle or  game you find here is available for download.  Just scroll down to the bottom of most any description page and you'll find a "Download executable" link. Downloaded programs are in "zipped" format to reduce size and may require an "unzipper" program unless you are running Win XP or later.  Here's a link to a free one. 

Check  out  the Most Popular  Downloads from DFF   (updated weekly)

First time visitor?

Take a look at the Introduction page to see what this site is about

Notes for Teachers


What's New

September 20, 2016:  A viewer recently reported significant error with the BigFloat "Divide" and "Reciprocal" operations.  Divide works by computing the reciprocal of the denominator and multiplying  by the numerator.  If the value passed to Reciprocal directly or as a denominator is negative, values returned were incorrect.    The error has existed for several months, so hopefully negative denominators are rare.  BigFloatTest was reposted today with a link to the corrected test program executable, source and a new version of the DFF Library file containing the offending module.

If you use this unit and 1/-1 does not return -1 as the result, you need this fix!     

September 18, 2016:  It seems like our License Key Generator program has hit a busy streak recently, averaging 12 downloads per day for the past month and moving it into the top 10 downloads for the year.  And that was while lacking the ability to encode the letter M!  I suspect that many of the downloads are by those wishing to generate an activation code for Windows or Office, etc.  They'll be disappointed.  The program implements how I might protect my programs if they were for sale.  They are not (everything on this site is free!)   Anyway, License Key Gen Version 2,2 posted today adds a few refinements and allows Mary Doe (as well as John) to register their programs J.

 September 8, 2016:  A program that still gets updated after 14 years must fill some "niche" demand.  My "Logic Problem Solver" fits that description.  Originally written to help solve those Logic Grid problems appearing in the Dell puzzle magazines, solving requires filling a truth table grid using a number of  formal logic reasoning strategies with Latin names like "Modus Tollens", "Modus Ponens", and "Reductio ad Absurdum" whether the solver knows it or not.  . Thanks to  "geocaching", tougher logic puzzles are still floating around.   This week's update to our  Logic Problem Solver V5. 6  program was triggered by note from a "cacher" solving a large puzzle called "Misadventures on Goose Island".  I alternated between trying to solve it and fixing/enhancing the program with more success on the fixing than on the solving.   Although it is almost as addictive as coding, I'll leave the final solution to the fellow who reported it to me and just post the updated program for now.   :

August 29, 2016:  Either the projects are getting harder,  I'm getting busier with non-coding projects, or I'm just getting slower with age.  Probably all three.  In any event, here's a puzzle from the August 11 Mensa Calendar page that occupied a couple of hours a day for the past 2 weeks:  Mind Your ABCDs requires placing those 4 letters in a 5x5 grid with the number of each letter in each row and column as specified in this diagram.  There is an added restriction that the same letter cannot appear in two adjacent cells the the same row or column.  The program allows user play with counts updated as letters are placed.  There's also a Solve button that was the fun part of creating the project. 


August 3, 2016: Here's a "Word Attribute Puzzle Solver" which uses predefined rules to apply predefined "letter sets" to a given set of phrases with unknown common characteristics.  The objective is to find for a rule/letter set combination which applies to all of those phrases and to a single phrase in a second list of solution candidates.  I peeked at the backside of this calendar page to get the solution and coded the appropriate rule, but the program might provide a platform for me to do better with future puzzles of this type.


July 20, 2016:  Whew!  I'm up and running on a new laptop after a three-week conversion effort.  New computer + New Operating System = Lots of learning opportunities!   The old faithful Dell Studio 17 decided it was time to retire, so action was required .  The upgrade story was originally posted here, but moved to this HP Envy page because it is rather long.

I did manage to get one project written and  posted today - Keypress Display Demo displays all character keys entered on the keyboard from any application.  A user had suggested it as a way to view password entry for older programs that do not have the option of viewing the keyed characters before submitting the password.

June 28, 2016:

 2 1/2  weeks of this month found us out west in Utah, Montana, and Wyoming  visiting five National Parks with a daughter and her family.  Seeing  the animals and geological wonders was nice, but the family time was even better.

Probably only time for one program this month;  this June 16 Mensa calendar puzzle was chosen because I couldn't solve it manually in the 5 minutes I allocate to these things.    The program Revolving Letters allows users to rotate columns to find a solution, or let the program do the grunt work and solve it for you.  Computers really shine at "grunt work"!

May 28, 2016:  A fix applied last month to our Cutlist program (See April 3, 2016 "What's New" post), introduced a problem which prevented the printing of user generated solution diagrams.   Cutlist Version 4.04 was posted today to correct this problem.

May 27, 2016:  May has been a busy month - one granddaughter earned her Dr. Pharmacy degree and another got married.  We travelled to attend both.  We're proud of Kristen and happy for Sarah.  Coincidentally, if things go as planned, we will be attending Kristen's wedding and Sarah's graduation as a Chem. Engineer next spring!  

The intervening days were spent catching up with mowing, garden care, tree trimming, etc.  Evenings allowed me to complete the DTMF (Touch-tone) Decoder Test program.  Here's a picture of the device put together by the family Electrical  Engineer (my son) which listens for tones and sends the  decoded digits to my program for display.  Probably not of interest for the majority of viewers, but if it is, visit the link for more details. 




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