I figured it out thanks!

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- 07-05-2011, 12:52 AManthropamorphicConvert A String To Math Problem
I figured it out thanks!

- 07-05-2011, 12:59 AMDark
Are the spaces there in every string? If there was you could string.split your string into an array. Then you would just have to figure out which ones were numbers and which ones were symbols.

Take a look at the api: String (Java Platform SE 6) - 07-05-2011, 01:08 AMFubarable
You could use Java's ability to run scripts and allow JavaScript to parse the equation for you. Please have a look here: scripting-for-java-platform

and here: formula-expression-to-result - 07-05-2011, 01:15 AMDark
Hmm, that is definitely a more simple approach. I guess I learned something today :P:

- 07-05-2011, 01:19 AMJodokus
- 07-05-2011, 02:07 AMJunky
If you cannot use Javascript, what you need to do is convert your infix (2 + 3) expression into a postfix (2 3 +) expression. Then you can evaluate the expression using a Stack. For each operand (number) push onto Stack. For each operator (+-*/etc) pop off 2 values from the Stack, perform operation, push result back onto Stack. Once you are done the only value left on the Stack should be the result. If you Google you should find plenty of info on how to do this.

- 07-05-2011, 02:32 AMJodokusQuote:

what you need to do is convert your infix (2 + 3) expression into a postfix (2 3 +) expression.

It is one of the projects I still borrow from the most in other projects (currently a matrixcalculator: I can just use sin2pi or sin(2pi) in my matrix which is much more palatable then 2 pi * sin (or something like that)). - 07-05-2011, 04:24 AManthropamorphic
Thanks for all the suggestions I'll try them out and hopefully I will be able to figure it all out. (I'm not the best at java yet)