Shoutbox

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

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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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I'm ok.

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

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lol... less technical??
Hummm... 1+1=3 in stuffplug?
I'll try to make an advanced calculator (some algebrical fct, and no byte limitation)... so maybe stuffplug can remove /xcalc command from her release... or I can change that in next versions.

That will be a good idea that we can see a page with all commands from all popular plugins.

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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It's not really complex tbh, but I agree it's counter-intuitive for those used to infix.