Enter an equation into a textbox and it will automatically calculate an answer

Hi All,
I have created two textboxes.
What I would like to do is after entering an equation, e.g.
"(9-5)*30 + 1", into the textbox 1,
textbox 2 will automatically gives me the answer "121".
I have no idea which function can give me an int 121 from a
string "(9-5)*30 + 1" or I have to build one by myself.
Are there any build-in functions in AIR could help?
If I have to build one by myself, are there any sample code
for me to reference??
Many Thanks!!

Your choices are:
* Parse the expression and calculate it yourself, which is
probably hard.
* Google for a library that aleady does it
* Pass the expression string to the browser via
ExternalInterface and evaluate it using javascript's eval()
function.
Tracy

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Enter an equation into a textbox and it will automatically calculate an answer

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