Yip,

here my first and really simple MsgPlus calculator plugin...


commands:

/xcalc algebric_expression

/xprecis floatting_point_precision  (by default precision = 2)


example:

/xcalc ((2+1)*(2+1))*(2+1)
=27

/xcalc (((2+1)*2+1)*2+1)
=15

/xcalc (666/77)*8+(2*3.5)-(2.78*8.7)
=52.01

/xprecis 16

/xcalc (666/77)*8+(2*3.5)-(2.78*8.7)
52.0088051948052050


CAUTION!
you must use () when some * or /

/xcalc 666/77*8
=1.08                             ==> FALSE !!!

/xcalc (666/77)*8          ==> TRUE !!!
=69.20

I'll correct that in futur releases and I'll implement all basic algebric function like abs(), mod(), pow(), sqrt(), ...

Futur versions will be multiple precision arithmetic (no bytes limitations )

Report all bugs here please.

Just downloaded, installed. Works good. But I doubt if I will use it... No bugs. Works fine for me ....Good Job ....

you're the first to test it

I think I'll developp a complete math tool in the futur...
Don't know who will use it.. ehehe
just me? ihih

I just use my calculator on my pc......But I will give it to people if they ever ask for something like this....P.S. Why didn't you get beta testers before ya released??

you're my beta tester
Why are you asking that? Some bugs?

You should make a installer. It looks pretty good from the looks of it tho. No bugs found.

I'll make an installer when it will be a little more advanced... it's just for test here

No. No bugs. Just asking why didn't you get beta testers before you made it public .

because you are my beta testers... it's a plugin dev forum here I think...

Have you considered using Reverse Polish notation? It completely removes the need for parentheses.
Example:
(6+4)*10
becomes
6 4 + 10 *
Both result in 100.

Yes... but it's a less natural notation...
Implementation that use PostFix notation (RPN) are stack based... operands are popped from a stack, and calculation results are pushed back onto it. Although this concept may seem obscure at first, RPN has the advantage of being extremely easy for a computer to analyze due to it being a regular grammar.

I prefer to use Infix notation because it's easier to write the algebric expression. I'm not sure that everybody are familiar with Postfix ...


One classic exercise in computer science is to write a parser for algebraic expressions, that is, a program that takes an input string like


(3 + 5) * (-4 + (2 - 9))


and calculates the result of this expression. In fact, what you do to compute that expression is to convert it into an internal representation, and then evaluate that representation.

You can represent the expression given above by a linked list:

where each node of the list either contains an operator or a number. Once the arithmetic expression is given in list form, evaluating it is easy and can be done in a straightforward, object oriented way...

The /xcalc is used by djmystics stuffplug so it is using stuffplug rather than yours

what's doing the /xcalc command from stuffplug?

your calculator plugin is using /xcalc

lol... thanks a lot!

and what's the action performed by the /xcalc comand from stuffplug ???

Postfix is rather complex and hard and weird for people who never used it before so I think you shouldn't convert your plugin to use that. Instead, you should figure out a way to effectivly convert infix to postfix, and then interprete the postfix. That way you won't have any problems with the ()'s etc.

stuffplug uses /xcal as a calculator too but it is less technical

quote:

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Postfix is rather complex and hard and weird for people who never used it before so I think you shouldn't convert your plugin to use that. Instead, you should figure out a way to effectivly convert infix to postfix, and then interprete the postfix. That way you won't have any problems with the ()'s etc.

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stuffplug uses /xcal as a calculator too but it is less technical

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Make an advanced calc that wil b cool(ish)!

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Originally posted by lhunath
Postfix is rather complex and hard and weird for people who never used it before

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Looks complex

( 6 + 4 ) * 10 has 7 important tokens.
6 4 + 10 * has five important tokens.
Taking into account the stack-implentation of RPN, it is slightly simpler, especially from a program's POV.
* RaceProUK may use Reverse Polish for any maths questions on his next exam...

i don't see whats wrong with createing a quick text /calc
to be a /run link to the MS calculator

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Originally posted by Orkblutt
/xcalc 666/77*8
=1.08                             ==> FALSE !!!

/xcalc (666/77)*8          ==> TRUE !!!
=69.20

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That makes me wonder how you do the calculation and what functions you use... because in most language of today (VB, C++, etc... ) there is already an evaluation function for such things. If you use that, you only need to pass the string and you would never have problems like that....

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note about using "-": it is best that you don't implement substractions, but only additions! If a minus is used, it should be considered part of the number, not a math-function. If you do this you also wont have problems with: "8 - 5" because your function would calculate "8 + -5", but most importantly, you can do "8 * -5" without any additional coding...

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So... I'm realy interested in the method you use...

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Hey nice plugin works great

P.S. srry for the earlier confusion

you don't need to register it.

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Originally posted by CookieRevised
http://trubetskoy1.narod.ru/english/ppne.html

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thank you!
I'll see if it's necessary to use RPN (if I've too more difficulties with Infix)
thanks for this link