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  1. #1
    Priegelaar is offline Member
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    Default Parse input from console

    Hey everyone

    I am VERY new to Java. I do have experience with Javascript/html/css/sql/php and C#.

    So I want to make a calculator and the user has to type the command by himself
    example:
    Java Code:
    calc> 15+9
    By the user input I have to deliver the outcome, which will be 24.
    I know how to make a switch case or if-iterations to decide wheter it has to count/divide/...
    But the problem I have is to parse the input from the user
    I want to parse the input into number1 = 15, operation ="+" and number2="9".
    How do I solve this?

    Extended question: how do I solve this:
    Example:
    Java Code:
    calc> 15+8+4+6+8

    Thanks in advance

  2. #2
    kjkrum's Avatar
    kjkrum is offline Senior Member
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    Default Re: Parse input from console

    Simple arithmetic calculators are a common introductory example for the topic of recursive descent parsers.

    https://www.google.com/search?q=recu...ser+calculator
    Get in the habit of using standard Java naming conventions!

  3. #3
    JosAH's Avatar
    JosAH is offline Moderator
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    Default Re: Parse input from console

    One of my blog articles discusses a simple (but rather complete) expression parser and a couple of ways to evaluate an expression (an interpreter and a code evaluator).

    kind regards,

    Jos
    cenosillicaphobia: the fear for an empty beer glass

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