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Thread: Help me in java coding

  1. #1
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    Default Help me in java coding

    I had just started learning java and i totally have no experience in programming before.

    So my lecturer asked the whole class to create a coding to detect identifier problems.

    The question is:

    Create a coding by asking user to input random letters and etc.

    If the there is no identifier error the output will print out " Successful data input" and vice versa "The data contains identifier error".

    My lecturer said its a simple coding but i still can't figure it out. So somebody please help me and do make it simple because i had only learned till buffreader.

    By the way im using texpad.

    Thanks in advance and hope the problem will settle asap.


  2. #2
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    Default Re: Help me in java coding

    Break the program into simple steps and do them one at a time.
    First step:
    ask the user a question and get his response.
    Then print out his response.

    Look at the Scanner class for ways to read the input.

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    Default Re: Help me in java coding

    I only want to know how to detect the errors of the identifier so that i can create the coding and the produce the "The data contains identifier error".

    I only manage to get to the successful data input. But when i input random letters that contains # it still comes out as successful. So i want to know how to detect the identifier error in the coding.

  4. #4
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    Default Re: Help me in java coding

    I only want to know how to detect the errors of the identifier
    To do that you need to define the "syntax" for a valid identifier.
    Do you have that? What is a valid identifier?

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    Default Re: Help me in java coding

    example if i input : #alslsl

    It would print invalid as it cannot start with the # symbol, % symbol and numbers.

  6. #6
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    Default Re: Help me in java coding

    To write the code, you need a definition of what the code is to do.
    Can you define what a valid identifier is?
    Or what an invalid identifier is? Examples are not good enough, unless you can list ALL of the millions of bad identifiers.

    Something like this: The first character must be an uppercase letter from A-K, followed by 2 or more numeric digits in the range 4-7 followed by 1 lower case letter in the range: k-m. For example: H445m is valid. H4k is not valid.

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