A String question.

[Luis Manuel O.Soares]

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        Hello.

        I' working on a project at the university of Minho (Portugal), and i would 
like to leave a question to you.

        Is there any function that takes a String as an argument and returns a 
numeral??

        I would like a function that deals with things pretty much like this one:
        f ("2 + 3 * 2") = 8


        Thanks for your time, and i'll be waiting for an answer.

                Respectfully...

                Luis Soares