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Piss Issue 46
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- P.I.S.S. Philez Number 46 =
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- All The Calc Programming You'll Ever Need =
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- by Defenestrator =
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Well, calculator programming sure is a good way to kill that math class
or draw attention to yourself. I've gotten asked (by a teacher) "Is
that a calculator or a Game Boy?". Now you too can be leet on the
calculator, while everyone else is busy sleeping or something else, you
can be playing Indycar racing or something like that.
This programming is for the TI-81 especially (since that's what I have),
and all these programs will work fine on the TI-82 and TI-83. Some of
this will work on the TI-85, while if you have a Casio or something else
then you're pretty much screwed.
I'll include some examples of my work in the .zip file that should come
with this txt. If you don't get them then you can email me at
defenestrator@hotmail.com or visit our website at piss.home.ml.org .
Let's start with some of the easier program commands.
To get to these you have to press PRGM at the starting screen, then EDIT
any program you like. Enter the title in alpha codes, then hit down and
you're ready to start. Hit PRGM to get all these commands. You should
get a list like this:
Note: I'm assuming this is your first time programming ANYTHING so be
patient if you have to go through a lot of crap.
Under the CTRL Menu:
1: Lbl - This labels a line for a Goto statement (duh)
2: Goto - This will shift to different parts in the program which will
execute some code.
3: If - This executes a simple IF/THEN statement which has a weird
format for those who program in languages like QBasic or pretty much
anything else.
4: IS)> - I have no idea what the hell this is, I never use it.
5: DS(< - Same as above. Might be increasing/decreasing but who cares.
6: Pause - Makes the program wait for an ENTER input to the keyboard.
7: End - Ends the program. You can have more than one of these and most
times it doesn't screw up. On TI-82's and 83's I have had problems with
this statement, in which case you just use:
8: Stop - Stops the program. Pretty much the same as End, but I like
End better.
Under the I/O Menu:
1: Disp - Displays whatever variable you put after it
2: Input - Waits for input from the keyboard, and normally stores it in
a variable.
3: DispHome - Displays whatever you specify on the calculation screen
while clearing it before display.
4: DispGraph - Displays whatever is on the graph.
5: ClrHome - Clears the calculation screen.
Under the PRGM Menu:
Lists all the programs you have, incase you run a utility program which
does something like resetting a graph incase you have to do actual work,
or even program subs (this happens if you don't want just one huge file,
which I myself don't mind, but hey, I don't care.)
You can also use functions under Draw or Math, but I'll discuss those
under the programs where you actually use them.
Command Explanations
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Lbl: In a program you use it like this - Lbl 1. This allows you to
repeat this code block if you use a Goto 1 somewhere else, which is
useful if you want to start over. It also gets pretty confusing if you
don't remember which line you labeled, so I advise either writing it
down or using the same system for all of your programs. You also can't
use numbers more than 9, otherwise it screws up.
Goto: Used to go to a certain line. Like if your ending menu (Play
again?) turned an answer of yes, then you can do a Goto 0 to make it go
to start if you labeled the start 0.
If: Probably the most important statement in the entire code list,
except for maybe Disp. Used like this:
If X=1
Goto 0
Goto 8
This means after you put an Input statement in, setting this variable as
X, if the user puts 1 in then the program goes to line 0. There is no
"else" statement, which really pissed me off when I first started.
However on TI-82's and 83's there is an else statement, but it's pretty
much used the same way.
Pause: Used to pause the display until Enter is hit. Most of the time
this is useful for formula programming and you just want the answer to
stay on the display, or if you just want to make them hit Enter to
acknowledge that they are still playing the game.
End: This part just ends the program and tells the calculator not to
execute any more code. Note: You can have more than one end, such as a
Lbl Sub after an End somewhere.
Stop: Pretty much the same as an End, except does not execute any other
thing after it, no matter whether there is another Sub or not.
Disp: Used to display variables and text. Used in 2 different ways, as
shown below.
Variables: If the variable you want to show is X, then: Disp X
Text: If you want to show SCROGG MOLESTS CHICKENS (there is no lower
case) then: Disp "SCROGG MOLESTS CHICKENS"
As far as I know you cannot put text and variables in the same line,
otherwise it screws up. I tried Disp "YOU HAVE" X "DOLLARS REMAINING",
but it just took the X out, so just put them on different lines.
Input: Used to get input from the keyboard and store it in a variable.
Remember this is not C and you don't have a million variables, you're
only limited to 27 (all the letters plus the theta), so make use of it.
Usage: Input X
DispHome: Used the same way as Disp, except it displays it while
clearing the screen.
DispGraph: Used to display certain variables in point form (X,Y) on the
TI graph. You can't change this image, that's why you use Pt-Chg under
the Draw section. More on that later.
ClrHome: Clears the screen display.
Draw Functions
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These are used to draw points and lines which can be moved around to
simulate movement. The menu can be accessed be using [2nd] [PRGM].
1- ClrDraw: Used to clear the graph. As if you couldn't figure this out.
2- Line( : Used like this (if you are drawing a line from point (X,Y) to
(A,B))- Line(X,Y,A,B). You don't have to put parentheses at the end but
it just makes me feel better to do it. The use of this, duh, to draw a
line.
3- Pt-On( : Turns a certain point on in the graph, but watch your
coordinate setting otherwise the dot will just appear off screen
somewhere. Used like this: Pt-On(X,Y)
4- Pt-Off( : Same as Pt-On, except turns a point off. Duh.
5- Pt-Chg( : Changes the position of a point only if the point is
assigned to a variable. Usage: Pt-Chg(x+1, y+1).
6- DrawF : Draws a function like the Y= thing you actually use in math
class. Usage: DrawF X+5
7- Shade( : Haven't quite figured this one out yet, but haven't had to
use it either.
This file should be included in a .zip with examples of programs that
work using these methods. If your text file did not come in a .zip,
please go to http://piss.home.ml.org and get file #46.
-defenestrator
defenestrator@hempseed.com (even though I'm not a stoner, I like the
address)
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