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[TI BASIC] Number of IF statements allowed?
Posted: Thu 22 Feb, 2007 6:45 am
by Clordio
Newb alert! Newb alert! Lol, ok so I am using tutes and such to teach my self basic on the TI-83. After each lesson, I try to use the new functions I have learned in all sorts of ways to help gain better understanding. So I just learned If Then statements and I was wondering if there is a number of allowed If's? My code goes like this.
Code: Select all
ClrHome
4->C
4->B
Lbl D
prompt A
If A=4
B-1->B
Goto E
End
If A=6
B+1->B
Goto E
End
If A=2
C-1->C
Goto E
End
If A=8
C+1->C
Goto E
End
Lbl E
ClrHome
Output(C,B,"?"
Goto D
Basically I'm just moving the question mark around the screen. Problem is, it will only move left and right... I've switched which commands come first and the first 2 If's work, but the last two don't. Help please.
Posted: Thu 22 Feb, 2007 10:17 am
by King Harold
"If" does not go with "End"
"If" "Then" goes with "End"
"If" is just used on its own and it will skip the NEXT like when FALSE, "If" "Then" will skip everything until the next "End" when FALSE. If the condition is true then they do nothing except take time. (TRUE being 1 or greater)
Also, those "End"s you have will never be executed since you "Goto" before the parser gets to them. "Goto"s are relatively slow and unreachable code is not very useful.
So, to fix your code, add a "Then" after every "If" ("Then" can be found right between "If" and "Else")
Or better yet:
Code: Select all
1->A
1->B
repeat 0
repeat Ans
getKey
End
Ans->K
Output(A,B," %that is 1 space, and this is a comment
B+(K=26)(B<16)-(K=24)(B>1)->B
A+(K=34)(A<8)-(K=25)(A>1)->A
Output(A,B,"?
End
Untested but should work ('work' being defined as "moves a question mark around the screen using the arrow keys")
Lesson learned: conditionals build into functions are faster than If/Then statements.
PS: the number of IF statements allowed is unlimited except by the size of the RAM.
Posted: Thu 22 Feb, 2007 1:44 pm
by Clordio
Awesome, thank you King Harold. I haven't learned getkey or repeat yet, so I don't understand that code you used just yet. But I'm definitely happy to have my little ram eating noobasaurus code running.
Posted: Thu 22 Feb, 2007 2:23 pm
by King Harold
I edited my example program so that it works (changed zero to 1 at the beginning)
I'm glad you got it working
Repeat conditional
code
End
works a bit like:
label X
code
If not(conditional
goto X
But repeat stores the adres to which it should loop back, unlike goto, this is faster but if you escape the loop (with goto) then Repeat will fill the RAM with pointers and eventually the calculator will slow down and give a ERR:MEMORY, so be careful to make the conditional so that you will never have to escape a Repeat loop with "Goto".
Posted: Thu 22 Feb, 2007 6:31 pm
by Clordio
Awesome, thanks for the advice. I remember coming to Maxcoderz.com YEARS ago when you guys had an actual front page. I always wanted to be a part of this coding scene and it's great to get started. After I master TI Basic, I hope to learn C or C++, basically something to get me ready for ASM.
I really like Basic though because you can do it right on the calculator. Is there some sort of program that allows you to write and compile ASM on the calculator itself?
Posted: Thu 22 Feb, 2007 7:16 pm
by King Harold
Yes there is, there are many on-calc compilers (I hope I can rewrite my own failed one some day..) like "TASM on calc" and "Chasm" and many others. Or you could write native code in a program which starts with AsmPrgm, but that's hard (I do that in math class, I have a program which is a list with all commands and their code, I look up the command and type the code in the assembly program) you can squish it with AsmComp(sourceProgram,nameOfCompiledProgram
don't forget the prgm tokens in front of the names
There is still a frontpage, but I liked to old one better I think..
Also, I would say calculator ASM is easier than C++, and if you want to learn a C-type language I think it might be best to learn C# which is a lot easier than C++ and just as powerful.
Posted: Thu 22 Feb, 2007 11:09 pm
by Clordio
The only reason I wanted to learn C was so I could be ready for ASM on the calc. What programming language should I learn before ASM? C#?
Posted: Fri 23 Feb, 2007 12:08 am
by threefingeredguy
No. No. NO. C# is like the opposite of ASM. Why not just learn ASM?
Posted: Fri 23 Feb, 2007 1:11 am
by Clordio
Well I keep hearing that you should learn another language first. I want to just start with ASM, is it possible? I'm on a mac, so I'm wondering if there are any restrictions for that.
Posted: Fri 23 Feb, 2007 1:14 am
by threefingeredguy
Yes, there are no tools for developing ASM on a mac. If you have an intel-based one, it's possible to convert Spasm. Also, when there is support for Visual C++ apps (coming in the future, I hear) you should be able to run Brass.
There's also a web-based assembler somewhere that someone could provide a link for, but I don't think you can make them into 8xps with that.
Also, no one post a link to that assembler from ticalc.org for mac. It does NOT work. I've tested it on 8.1, 8.2, 9.2, and all versions of OS X. It does NOT work.
Posted: Fri 23 Feb, 2007 1:41 am
by Clordio
Ok. Maybe some of the ASM developing tools will work on a pc emulator? I'd really like to get into ASM after I learn Basic, or maybe I should try to learn how Xlib works? So many choices lol, but I'm excited.
Quick question are physics at all possible in Basic? Not the science but like platformer physics. My first game I want to be a platformer.
Posted: Fri 23 Feb, 2007 2:02 am
by threefingeredguy
Yes, but it's fairly slow. About the fastest you can get will be something like CDI's Metroid. You can see a couple examples of that in the Staff/Featured Projects Forum.
Posted: Fri 23 Feb, 2007 2:21 am
by Clordio
This has been a great welcoming and I already feel at home in this forum. Thanks so much everybody, and I hope to post my first game in the next month here. Won't be anything flashy lol.
Posted: Fri 23 Feb, 2007 10:53 am
by benryves
threefingeredguy wrote:Also, when there is support for Visual C++ apps (coming in the future, I hear) you should be able to run Brass.
For the record, I'm no masochist. Brass is written in C#,
not C++, and so will run under MacOS via Mono.
However, automatic app signing relies on COM interop with TI's Wappsign, so won't work.
Posted: Fri 23 Feb, 2007 12:46 pm
by CDI
Physics are fast and fun, Axcho proved this with his intuitave N-Game engine, and if you work around it, you can apply it to a platformer easily. The hardest things are friction and gravity. For most of the things I do, I cheat and make the terminal velocity of the player quite low. Friction is a good effect on something like ice, for instance you can set normal blocks to have a friction on 100%, meaning you can move one over and not keep sliding out of control, while your ice may have a friction of 50%, so you press left and your character goes left, and then left again!
threefingeredguy, if you are referring to Metroid 1, that was a failure at coding and I still need to update it with the Metroid Pure engine(s). Metroid Infinity is at least 3x faster in some places, and up to 4 or 5x faster so HA
