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Gud-dai!
How do you write the Australian pronunciation of
"good day"? The Olympics are over, but I've been communicating
this week with a tutor who lives in New Zealand. He writes
like would speak with a similar accent. He has provided some good
feedback on first versions of the Scientific Grapher
program. I decided to go ahead and post the source code for this
program, even though it won't compile on Delphi Standard. It requires a
version with the TChart charting component included in Delphi 5 Professional
and Enterprise versions for sure, perhaps Delphi 4.
The executable version if Sci-Grapher
is available for download though. It will run on any Win32 system
(Win 95 and above).
Programs about two other topics were posted this
week: Tetrahedrons and Permutations.
Tetrahedrons are triangular pyramids. If you
place three marbles on a flat surface all touching each other and place a 4th
marble on top, you have made a tetrahedron. The next larger size
would have 6 marbles on the bottom, then 3 in a second layer and 1 on top for
a total of 10. If you continue building larger pyramids this way,
there is only one other whose total number of marbles is the square of an
integer. We'll consider 1 to be the smallest with total of
1=1X1 marbles, the 4 marble pyramid is the second (4=2X2).
The program Triangular Pyramids finds the 3rd.
The total number in these pyramids form a sequence
of tetrahedral numbers with many interesting
properties (for example they always occur as 3 even numbers followed by an odd
number). The number of marbles in each layer form a sequence of triangular
numbers, also very interesting. There are only
5 numbers that are both tetrahedral and triangular.
Three programs about permutations were posted.
Permutations are rearrangements of things. The letters ABC can be
rearranged in 6 ways - there are 6 permutations of 3 things.
Permutes1 introduces the topic and displays all
permutations for a number that you enter. (Well, within reason -
there are over 3 1/2 million ways to arrange 10 things. I don't
think the program would print them all.) Rotating
Sums is a program that solves a particular problem for the
digits 1-9 arranged in a 3X3 grid. I'll let you go to the website for
details. Alphametics solves word arithmetic
problems like ADAM+AND+EVE=MOVED where each letter stands for a different
digit.
That's it for this week. We had our first snow
flurries this morning, so I guess I had better go start getting up our
winter's supply of wood.
700 viewers to date.
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Gary Darby http://www.delphiforfun.org ------------------------------------------ If you find something you love doing as you're growing up, look hard to see if you can make a living at it instead of giving it up for something more sensible. -- Jennifer Lamb (stuntwoman) |
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