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Thread: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

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    Default URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    Write a Java program ExtractNumber.java to read the data via the keyboard, character
    by character and print the first number (with or without a decimal point) contained in the
    input. For example, given the input data: Mary works for $43.75 per hour, the program
    should print 43.75 to the screen.



    When i entered the sentence "The lady works for 8 hours at $10.00 per hour" ERROR: My output was 810.00 instead of simply the first number 8
    Last edited by Java girl; April 13th, 2014 at 04:47 PM.


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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    Didn't make the deadline. Bummer. And so close.

    Your version apparently collects ALL numbers from the input string rather than collecting only the first occurrence of continuous numbers. Another decision statement to end collection with the end of the first number was required.

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    Yup, sighh. Thanks, how exactly do i go about doing that? would still like to know.

    --- Update ---

    I figured it out thanks for the guidance.

    --- Update ---

    Umm, apparently it isn't working like I thought, sighh, any help?

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    Post the new version of the code and explain what the problem is. Post the program's output and add some comments showing what it should be.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    if(Character.isDigit(character)||sentence.charAt(i )== '.')
    {
    if (sentence.charAt(i)== ' ') of the digit
    break;
    System.out.printf ("%c",sentence.charAt(i));
    }

    }


    The program should only print the first integer or double entered.
    The above is the new person.
    I entered the sentence "Jane works for $450.00 an hour for 5 days"
    The program prints 450.005 when it should only print 450.00 which is the first double.
    Last edited by Java girl; April 13th, 2014 at 05:06 PM.

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    Have you worked out the logic that the code needs to implement?
    List the steps the code needs to take to solve the problem.
    Here's a start:
    ask user for input
    read input into a String
    loop through the String one char at a time
    >>> What needs to be done here inside the loop as each character is obtained?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    check to see if it's a digit

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    Ok that's one part,
    then what does it do next:
    if it is a digit
    if it is NOT a digit

    and then what after that
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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    if it is a digit, print it, if not do not print it

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    Is that all? That logic will print ALL of the digits in the String? That is what the current code does.

    Don't you want to stop printing digits after the first non-digit is found following some digits?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    stop printing if digit reaches a white space

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    stop printing if digit reaches a white space
    I'm not sure what that means. Can you explain a little more?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    a white space signifies the end of a digit

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    How will the code know if a white space should stop the printing or not? There will be lots of white spaces in the String.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    I don't know if or where to put that in.

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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    Describe what the code needs to have to do that.
    The code needs to know if it has found a digit or not. A boolean variable can be used to remember that.
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    Default Re: URGENT HELP NEEDED IN AN HOUR:Printing first number in input

    ok, thank you.

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