Hello guys,
I've been looking everywhere and reading tutorials all over, but I can't seem to find how it's done.

How do I write what I want.. hmm.. let me give you an example..

- Input "How many occurring isotopes?", A

- then, if the user types "2" , it will display:
:Input "E-X AMU MASS: ",A
:Input "E-X ABUNDCE PER100: ",P
:ClrHome
:Input "E-Y AMU MASS: ",M
:Input "E-Y ABUNDCE PER100",Q
... Then it will do the calculations..



- but if the user types 3, then it will display:

:Input "ELMNT 1 ABNDCE P100",S
:Input "ELMNT 1 MASS",T
: (S)(T)→T
:ClrHome
:Input "ELMNT 2 ABNDCE P100 ",U
:Input "ELMNT 2 MASS",V
: (U)(V)→V
:ClrHome
:Input "ELMNT 3 ABNDCE P100 ",W
:Input "ELMNT 3 MASS",X
: (W)(X)→X
:T+V+X→Z
:ClrHome
:Disp Z
:Pause


- and if user types 4, then he will have to type 4 amu, and 4 percentages to input..
What im asking here, is how can I have it automatically have the user ask how many, and then once the user has typed how many then ask him to input "those" many, and then let me code the calculation.
Instead of having to make a menu of.. "You have","1",2","3,"4,"5..... etc


By the way, this is for the TI84+ silver edition.

You could do a loop, either While or Repeat would work for this.

Create a list with the dimensions based on the value given for the 'how many', and you can just reuse the same variables for most of it, need one to keep track which list element it is now working on.. And I think that would be it!

Could you show me how that would be done please

Question, you have multiplication going on in the second example, but not the first. Will it be doing the multiplication like the 2nd example every time, or no?

It's all the same.
Honestly I just want to learn how it's done to be able to do it to more apps in the future. That's my main goal.

Anyways,
This is essentially just:
- For one occurring
Elelment Abundance in percent, E
Element's mass, M

Then you do M*E-->X
Display X
and that's it.

but if you have more than 1 occurring, it would be
Elelment Abundance in percent, E2
Element's mass, M2
M*E -->X
M2*E2 -->Y

Y+X --> Z

Display Z


..... in other words, you multiply them.. and once they have been multiplied, you add them together.

Well.. To get the multiple bits down:


Code:


Then from there, you can manipulate the values of the lists rather easily, just like you do with the variables. To recall the 3rd place in a list, the format is |LISO(3).

On a side note, |L is denoting the small L used for naming lists, found by pressing [2nd] [STAT] [>] [B].

Code:

Thank you guys.
That worked perfectly.

I have never done anything with Lists, by looking at your examples, I am learning a bit about them.

Is there any tutorial that out there that explains this a bit more? sort of related to my question.
All the List and String tutorials I have seen (about 10) are all related to games..

I don't go that far into lists and string, but have you seen "Programming the TI-83 Plus/TI-84 Plus"? Also, welcome to Cemetech, and I'm glad this issue got straightened out. Feel free to introduce yourself in our topic for that purpose if you haven't already.

Already read that book.
Already knew most of the stuff.

Thanks for the recommendation tho.
I already introduced myself.

That's fair enough, and glad you bought my book. So what sort of things do you want to learn about strings and lists? As you say, there are tons of non-game ways to use them, and we'd be happy to write out a few posts helping you with some of the details.

Mainly what I said above. How to make programs repeat X number of times the user asked.
This would help me a lot in the future coding more stuff.

thanks
and btw, I know I said I knew most of the stuff, but pretty nice well organized book. It's better than most I've seen.

would be great if have something to TI-NSPIRE, dont u think!?