By the way, does anyone know of a PEMDAS-style evaluator in BASIC? It'd be really helpful for me when I add the operators.

I made a program that does all of these conversions in the same way and a whole lot more other features that I used for chemistry.  I can show you the source code if you'd like, I never released it.

I made a program that does all of these conversions in the same way and a whole lot more other features that I used for chemistry.  I can show you the source code if you'd like, I never released it.

Sure. How much memory does it take up, just for reference?

Quote from: Deep Thought on May 29, 2010, 02:23:02 am

By the way, does anyone know of a PEMDAS-style evaluator in BASIC? It'd be really helpful for me when I add the operators.

Doesn't the calculator already do this by default?

Yeah, but I wanted to see a BASIC program for the source code.

Good point, though. Probably no one would bother to make another one.

EDIT:
(I know I'm quoting myself here, but I'm too lazy to type it all out.)

Unfortunately, I couldn't figure out division, parentheses, or exponents, so I set it aside and continued with other projects. One day, I really needed to clear some ARC space, so I deleted the group where I had saved it (I called it CALCALCA). I finally started regretting this decision, and will start coding it again, but I really need help with the issues I mentioned above.

Never mind! The operations turned out easier than I thought, or at least easier than it seemed last year.

Thanks for offering your help, though!

UPDATE: Division, exponents, and ²/^-1 all work! If all goes well, I can get the final version of this program at least onto my thumb drive by the end of the school year.

EDIT2: Wow, this is the first time xor has ever been useful to me.

UPDATE2: Now it supports all of the units listed above, with all SI prefixes from yocto to Yotta. Anyone think I'm overdoing this?

This is DEEP THOUGHT'S 42^nd post!

Wow, this is the first time xor has ever been useful to me.

Nice!
I'm glad you're over here, Deep Thought!  I'd like to mention that I thought Insanity was great.  Nice job on it.

This looks pretty cool.  Good luck on it!

You might want to ask this question in a separate thread as it might get missed by some users who come to help.

Glad to see progress, though

What exactly was happening? (With TI-Connect.)
From what it sounds you were plugging the USB and the calculator into that and it won't just get recognized, right?

Yeah, that's about it. It was recognized by the driver installer, but not by TI-Connect.

Might just be the calculator. I was using a friend's TI-84 Plus which had been buggy (in calc-to-comp connections) in the past, while I've also used a TI-84 Plus Silver Edition that worked perfectly.

You might want to ask this question in a separate thread as it might get missed by some users who come to help.

Glad to see progress, though

I'll do that if I later if I still can't get it to work.

And I know it's been a while since this post was made, but:

Quote

Well, that's unfortunate. I can only upload files until mid-June.

Do you mean you do not have internet access at home, only at school? I remember when I was in that situation. Very hectic (altough I generally got a lot of free time for programming ).

Well, not exactly; there are other reasons. But here's a perfect example why I'd prefer to transfer programs at school even if I could do it at home.

Well it could also be the USB slot to. I know I have trouble with a couple of mine on my computer so you could just try switching where the cable is plugged in to see if that works.

Tried that, still didn't work.

Anyway, TI-Connect at school works (I love Macs ), so here's a version of my program. It comes as a group with two programs: CALCALCA (the main program) and LOW (an ASM subroutine to allow lowercase).

When you run prgmCALCALCA, nothing seems to happen, and the calculator still seems to be at the homescreen. It's actually already in the program; the blank screen is from the Input "",Str1. The program leaves most of the calculation intact, so if you type in a normal expression (such as 1+1), it'll just display the answer (with expr(Str1. The key is that the program checks for the string "_into_ or " INTO (notice the spaces), and if it's found within the input, it goes into evaluation mode.

Syntax for evaluation is [expression] into [unit] or [expression] INTO [unit] (again, notice the spaces). Other spaces are ignored by the evaluator, so you could type 5 N m into ft lb or 5Nm into ft*lb, and it would display the same answer. This is so that input is more natural and easier to read. However, the program is actually looping through each character in the string input, so the shorter the input, the faster the program can evaluate it.

If the units are mismatched on the two sides of the input, the programs throws an ERR:MISMATCH, but I have yet to add the other error messages (e.g., for unrecognized units).

I haven't compiled a list of supported units left, but in case you're wondering, they're all in Str1 (after you run the program at least once). Just look for the alpha characters. By the way, the program is case sensitive, so mPa is millipascals, while MPa is megapascals. Do not put an extra s at the end of a unit, even for a unit such as lb.

All SI prefixes from yocto to Yotta are supported, except for milli- and Tera- on three-character base units (such as cal, acr, and are), as well as millitonnes (who would ever use that?). All units must be abbreviated. Thus, 5 amperes²*6 ohms INTO milliwatts will not work, while 5 A²*6 ohm INTO mW will.

Addition, subtraction, and functions are not supported, and probably never will be, but since they are simply skipped over by the evaluator, 8 J into ft-lb will be read as "8 (J)" into "(ft)(lb)". Unlimited numbers of parentheses, division, exponentiation (including ², ³, and ^-1), and multiplication (duh) are supported.

I know, the program still runs pretty slowly. I'll still have to optimize some things. Until then, everyone is allowed (and encouraged) to look into the code, and suggestions are (very) welcome.

EDIT: Next time I post an update, I'll probably also include an easter egg ... or two.

EDIT2: Conditions remarked on in previous statement achieved here.