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making calculater

 
Ranch Hand
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hi all..i want to make dynamic Calculater using this approach:any number,or symbol you will put at the box will appended to a String ,so at last when i have a (for example)String like this:
i want to convert this String to result.....

hiw can i do that?
 
Bartender
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This is more of an intermediate question, so I'll move it...
 
Rancher
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Is the intent to learn how to program a recusive-descent parser that parses and evaluates such an expression, or are you looking for code ready to use? If the latter, I could recommend several classes and libraries that do this.
 
Alan Hermin
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ok,,give me these classes
 
Ulf Dittmer
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If I may plug my own stuff, have a look at the Expr class, which also supports functions and variables. For something more complete, there's the JEP library.
 
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