Exiting Loops

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TI-84 Plus CE

Exiting Loops

Gabe Prairie 29 Jan 2021 17:39

Hello!
I am working on a reaction game where it displays a number from 1-9 on the graph screen, and you need to push the number displayed on the screen before the time runs out. I have gotten the repeating function of displaying the number.

What I want to know it if you can create a loop, and as soon as you it number 1-9, it exits it, but if you don't press any key, It waits for an amount of time (I would prefer a time that could be displayed as well.
If you have any questions about what I am asking, just ask!
Thanks!

-Edit
I am pretty sure that it has something to do with a While loop, and Boolean Logic, but don't know how to do it.
Thanks!

Last edited on 29 Jan 2021 17:44 by Gabe Prairie Show more

Re: Exiting Loops

J_Walker87 29 Jan 2021 20:45

A While loop is exited when its condition is false. A repeat loop is exited when its condition is true. Using this concept, we can create loops that will exit when a value is true or false. Here is a program for that game you suggested, except it uses the home screen. Feel free to modify this to work on the graph screen. ("->" is the store symbol that looks like an arrow). The greater "T" is, the more time the player has. I recommend setting T to somewhere around 15, like it is in the program below, if it's a difficult reaction game.

ClrHome
15->T
randInt(1,9->X
Disp "NUMBER:","TIME:
Output(1,9,Ans
Repeat Ans or not(T
Output(2,9,"  // 4 spaces
Output(2,9,T
T-1->T
getKey->K
End
ClrHome
If max(X={K-91,K-78,K-65:Then
Disp "WIN
Else
Disp "LOSE
End
"

Re: Exiting Loops

J_Walker87 29 Jan 2021 23:05

Here's a second version I just made after optimizing some of my code:

ClrHome
15->T
randInt(1,9->X
Disp "NUMBER:","TIME:
Output(1,9,Ans
Repeat Ans or not(T
Output(2,9,"  // 4 spaces
Output(2,9,T
T-1->T
getKey
End
ClrHome
max(X=Ans-{91,78,65
sub("LOSEWIN!",1+4Ans,4

Also, I think you could use a For( loop for this, but I can't figure out how you would give it the exit-if-getkey functionality without causing memory leaks or stopping the entire program.

Re: Exiting Loops

Mr Bob Jr IV 29 Jan 2021 22:42

The way I achieve this behavior in my programs is using a Repeat loop, although like J_Walker87 said it could also be done with a While loop. Here is what I would do:

Repeat max(K={92,93,94,82,83,84,72,73,74
getkey->K
End

It will wait until the user presses one of the keys specified in the list before moving on (so if you press a wrong key, nothing happens).
Usually this method is very simple and compact, but in this case there are so many numbers that I bet it could be further optimized, probably similar to what J_Walker87 did with booleans in his example.