Programming Forums > Application Development > Visual Basic

davidguygc · Mar 20th, 2005, 10:14 PM

I'm sorry for putting this in this forum, but it's as close to a TI forum as I can find. Is there a way give the calculator instructions in case of the variable being null?
Thanks to anyone who can help,
David

tempest · Mar 20th, 2005, 11:14 PM

Yea, are you talking about like A-Z number vars, lists, strings, matrixes, pics, or gdb's?

I know everything about TI-Basic, lol.

davidguygc · Mar 20th, 2005, 11:16 PM

I'm using an 89, and so say i want someone to make a choice in a dropdown menu, and if they hit cancel, keep the program from saying undefinded variable error and just give it instructions on what to do, such as ending the program

tempest · Mar 20th, 2005, 11:41 PM

I've only written on TI-83+, if you could show me some code i might be able to help you out. On TI-83+ there is something called the menu() function which creates a menu with a title, and options and references to label name's that it's sent to...

TI-Basic(83+) Menu Example:

(Toggle Plain Text)

ClrHome
Lbl M
Menu("  Test program  ", "Goto A", A, "Exit", E)
Lbl A
ClrHome
Disp "This is a test"
Pause
Goto M
Lbl E
ClrHome
Output(1,1," ")

davidguygc · Mar 20th, 2005, 11:58 PM

OK

(Toggle Plain Text)

Dialog
Title  "The Ultimate Pre-Cal Program"
DropDown  "Calculate:",{"Area of �","Comp Angles","Degree�Radian","Grade","Find Quadrant","sin, cos, etc.","Distance"},feat
EndDlog

Determining feature 
If feat=0 Then
Goto  quit
ElseIf feat=1 Then
Goto  �a
ElseIf feat=2 Then
Goto  comang
ElseIf feat=3 Then
Goto  dtr
ElseIf feat=4 Then
Goto  grade
ElseIf feat=5 Then
Goto  quad
ElseIf feat=6 Then
Goto  sct
ElseIf feat=7 Then
Goto  dist
EndIf

but if you hit the ESC button, it doesnt give a number to the variable, and it continues on to the Ifs, and it is still undefined so it crashes, I have on other programs, set feat to 0 after the goto so it will have the

(Toggle Plain Text)

If feat=0 Then
Goto Quit 
EndIf

but if I want to retain the previous selection, I can't use it, which makes me want to know if there is some sort of NULL feature I can put into the coding

lunardragoon · Mar 30th, 2005, 5:47 PM

hmmm, I also just program on the TI-83 Plus but...I'll try not to be technical
ok, so you want to retain the previous selection...here we go then

Try this (in psuedocode since i havent programmer 89's):
( -> denotes that value is being stored to variable aka 1->A places the value 1 into A)

[beginCode]

...The first line of your programs initialize (declare your variables set to 0)...

...begining of program...
0->prevchoice
0->choice

...somewhere else in the program...
choice->prevchoice
0->choice
Dialog
Title "The Ultimate Pre-Calculus Program"
DropDown "Calculate:",{"Area of �","Comp Angles","Degree�Radian","Grade","Find Quadrant","sin, cos, etc.","Distance"},choice
EndDlog

...i modified this part...
if choice=0 Then
prevchoice->choice
goto quit
ElseIf feat=1 Then
Goto a
ElseIf feat=2 Then
Goto comang
ElseIf feat=3 Then
Goto dtr
ElseIf feat=4 Then
Goto grade
ElseIf feat=5 Then
Goto quad
ElseIf feat=6 Then
Goto sct
ElseIf feat=7 Then
Goto dist
EndIf
[endCode]

I dont know if that will work, but just maybe..... get back with me on the results

davidguygc · Mar 31st, 2005, 10:37 PM

Actually, I was just thinkin about doing that just the other day. The Chances of that working is 95%, so thank you a bunch. I am really suprised that there aren't that many 89 programmers out there. Take it easy
--David

Rory · Apr 2nd, 2005, 9:39 PM

Does this language not have a select statement?

uman · Apr 2nd, 2005, 9:55 PM

Rory, it doesn't have shit. I'm not really sure I would call it a programming language...

davidguygc · Apr 3rd, 2005, 10:02 PM

i wouldn't really call it a language either. You can run the program just by typing it into the home screen. I've actually confused myself, because it seems like a language, and it technically might be a language....idk.

Mar 20th, 2005, 10:14 PM	#1
davidguygc Programmer Join Date: Mar 2005 Location: Lubbock, TX Posts: 30 Rep Power: 0	TI BASIC help I'm sorry for putting this in this forum, but it's as close to a TI forum as I can find. Is there a way give the calculator instructions in case of the variable being null? Thanks to anyone who can help, David

Mar 20th, 2005, 11:14 PM	#2
tempest Programming Guru Join Date: Oct 2004 Posts: 1,041 Rep Power: 5	Yea, are you talking about like A-Z number vars, lists, strings, matrixes, pics, or gdb's? I know everything about TI-Basic, lol. __________________

Mar 20th, 2005, 11:41 PM	#4
tempest Programming Guru Join Date: Oct 2004 Posts: 1,041 Rep Power: 5	I've only written on TI-83+, if you could show me some code i might be able to help you out. On TI-83+ there is something called the menu() function which creates a menu with a title, and options and references to label name's that it's sent to... TI-Basic(83+) Menu Example: (Toggle Plain Text) ClrHome Lbl M Menu(" Test program ", "Goto A", A, "Exit", E) Lbl A ClrHome Disp "This is a test" Pause Goto M Lbl E ClrHome Output(1,1," ") ClrHome Lbl M Menu(" Test program ", "Goto A", A, "Exit", E) Lbl A ClrHome Disp "This is a test" Pause Goto M Lbl E ClrHome Output(1,1," ") __________________

Mar 20th, 2005, 11:58 PM	#5
davidguygc Programmer Join Date: Mar 2005 Location: Lubbock, TX Posts: 30 Rep Power: 0	OK (Toggle Plain Text) Dialog Title "The Ultimate Pre-Cal Program" DropDown "Calculate:",{"Area of �","Comp Angles","Degree�Radian","Grade","Find Quadrant","sin, cos, etc.","Distance"},feat EndDlog Determining feature If feat=0 Then Goto quit ElseIf feat=1 Then Goto �a ElseIf feat=2 Then Goto comang ElseIf feat=3 Then Goto dtr ElseIf feat=4 Then Goto grade ElseIf feat=5 Then Goto quad ElseIf feat=6 Then Goto sct ElseIf feat=7 Then Goto dist EndIf Dialog Title "The Ultimate Pre-Cal Program" DropDown "Calculate:",{"Area of �","Comp Angles","Degree�Radian","Grade","Find Quadrant","sin, cos, etc.","Distance"},feat EndDlog Determining feature If feat=0 Then Goto quit ElseIf feat=1 Then Goto �a ElseIf feat=2 Then Goto comang ElseIf feat=3 Then Goto dtr ElseIf feat=4 Then Goto grade ElseIf feat=5 Then Goto quad ElseIf feat=6 Then Goto sct ElseIf feat=7 Then Goto dist EndIf but if you hit the ESC button, it doesnt give a number to the variable, and it continues on to the Ifs, and it is still undefined so it crashes, I have on other programs, set feat to 0 after the goto so it will have the (Toggle Plain Text) If feat=0 Then Goto Quit EndIf If feat=0 Then Goto Quit EndIf but if I want to retain the previous selection, I can't use it, which makes me want to know if there is some sort of NULL feature I can put into the coding

Mar 30th, 2005, 5:47 PM	#6
lunardragoon Newbie Join Date: Mar 2005 Posts: 1 Rep Power: 0	hmmm, I also just program on the TI-83 Plus but...I'll try not to be technical ok, so you want to retain the previous selection...here we go then Try this (in psuedocode since i havent programmer 89's): ( -> denotes that value is being stored to variable aka 1->A places the value 1 into A) [beginCode] ...The first line of your programs initialize (declare your variables set to 0)... ...begining of program... 0->prevchoice 0->choice ...somewhere else in the program... choice->prevchoice 0->choice Dialog Title "The Ultimate Pre-Calculus Program" DropDown "Calculate:",{"Area of �","Comp Angles","Degree�Radian","Grade","Find Quadrant","sin, cos, etc.","Distance"},choice EndDlog ...i modified this part... if choice=0 Then prevchoice->choice goto quit ElseIf feat=1 Then Goto a ElseIf feat=2 Then Goto comang ElseIf feat=3 Then Goto dtr ElseIf feat=4 Then Goto grade ElseIf feat=5 Then Goto quad ElseIf feat=6 Then Goto sct ElseIf feat=7 Then Goto dist EndIf [endCode] I dont know if that will work, but just maybe..... get back with me on the results Last edited by lunardragoon; Mar 30th, 2005 at 5:53 PM. Reason: Didnt see the end of the post with the code :)

Mar 20th, 2005, 11:16 PM	#3
davidguygc Programmer Join Date: Mar 2005 Location: Lubbock, TX Posts: 30 Rep Power: 0	I'm using an 89, and so say i want someone to make a choice in a dropdown menu, and if they hit cancel, keep the program from saying undefinded variable error and just give it instructions on what to do, such as ending the program

Mar 31st, 2005, 10:37 PM	#7
davidguygc Programmer Join Date: Mar 2005 Location: Lubbock, TX Posts: 30 Rep Power: 0	Actually, I was just thinkin about doing that just the other day. The Chances of that working is 95%, so thank you a bunch. I am really suprised that there aren't that many 89 programmers out there. Take it easy --David

Apr 2nd, 2005, 9:39 PM	#8
Rory Expert Programmer Join Date: Jan 2005 Location: London Posts: 542 Rep Power: 4	Does this language not have a select statement?

Apr 2nd, 2005, 9:55 PM	#9
uman Expert Programmer Join Date: Dec 2004 Posts: 794 Rep Power: 4	Rory, it doesn't have shit. I'm not really sure I would call it a programming language...

Apr 3rd, 2005, 10:02 PM	#10
davidguygc Programmer Join Date: Mar 2005 Location: Lubbock, TX Posts: 30 Rep Power: 0	i wouldn't really call it a language either. You can run the program just by typing it into the home screen. I've actually confused myself, because it seems like a language, and it technically might be a language....idk.

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Programming Forums > Application Development > Visual Basic

TI BASIC help