Ti-83 help?

[|2eM!x]

Okay, im having troubles with a game im making..its a menu game like pimpquest...

but what the problem is two things:

i cant get loops to work for my life, so examples would be great

and secondly, my variables are wrong. I type x = "Hello"
then later on ill type: disp x
and it will return nothing...

if you need all the code i guess ill post it, but it will take hours

[dglienna]

Don't you have an emulator for your PC? I am pretty sure you can download one.

[penagate]

Loops
Just like VB there are several ways of doing loops.

The simplest way is to use a label at the start of the loop and a Goto within an If block at the end of the loop, but that's pretty crude.

*digs out manual*

Next there is a the For loop. The syntax of this is very like C++.

For(variable, begin, end, [incremenent])
    commands
End

So an example would be

For(A,0,5,1)
    Disp A
End

And the output would be

0
1
2
3
4
5

Next there is the While loop, which is equivalent to VB's Do While (condition).

While [condition]
    commands
End

And then there is Repeat which is equivalent to Do Until.

Repeat [condition]
    commands
End

Strings
You can't store strings within the numerical variables. What you can do is store them within the 10 string variables which are under Vars->7:String.

e.g.

"HELLO" -> Str1
Disp Str1

output is

HELLO

HTH

[|2eM!x]

i dont have an emulator on my pc. the dang calculator thing at the bottom got cookies in it and doesnt work anymore..thanks alot for the loops, i like the if with a goto loop the best here, but i dont want to run out of ram...so ill figure stuff out..thanks

[dglienna]

Hey, I think I may still have one of those sitting in a drawer somewhere

Check out this link: There are lots to choose from

http://www.ticalc.org/basics/calculators/ti-83.html

[|2eM!x]

okay , so ive got it working (the variables)
now how do i get the variable to minus 5 from itself? i thought like
varX = varX - 5
or
varX -> varX - 5

any ideaS?

[penagate]

(X-5) -> X

The assignment operator takes the left hand side and assigns it to the right

[|2eM!x]

okay sweet!

[wossname]

Was the TI-83 the first in this range to support strings? I have a TI-82 and I can't remember being able to use strings on it.

[penagate]

I believe it was. I just looked through the -82 documentation and couldn't find any reference to string variables, in the places where they occur in the -83 manual.

Do you have Vars->String ?

[wossname]

No. I checked last night and that menu only has 6 entries in it. I used to get around it by having a large and clumsy program that would print string literals to the screen as if it was a string aray. I just set the Theta variable to the number of the string I wanted to show and then call the program, which looked at Theta in an IF block and printed the appropriate string accordingly. Very bodged but it just about did the trick.

I did find the screenshot facility very useful though. For my maths GCSE we weren't allowed to have any programs in our calculators, so I rigged up a screenshot of a blank program menu and showed that to the invigilator when I went in. Very handy.

[penagate]

In South Aus the invigilators come round and watch us while we clear the memory But we're exempt from doing that in Maths subjects

How do you do a screenshot?

[k1ll3rdr4g0n]

In South Aus the invigilators come round and watch us while we clear the memory But we're exempt from doing that in Maths subjects

How do you do a screenshot?

Some emulators support export screenshots, or most file transfer programs for comp to calc support screenshots.