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Thread: string length problem

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    Question string length problem

    Hello, I tried to get the program to tell me when I entered more or less than 11 digits, but even if I made sure to enter exactly 11, it still said " number must be 11 digits long. " What am I doing wrong?
    import java.util.Scanner;
     
    public class temp {
    	public static void main(String[] args) {
    		Scanner scanner = new Scanner(System.in);
    		System.out.println("enter a number");
    		String number = scanner.nextLine();
    		int numberlength = number.length();
    		while (numberlength != 11) {
    			System.out.println("the number must be 11 digits long");
    			number = scanner.nextLine();
    		}
    		System.out.println("done.");
    	}
    }
    Last edited by ma5sacre; February 3rd, 2014 at 01:01 PM. Reason: solved.


  2. #2
    Junior Member Tjones787's Avatar
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    Default Re: string length problem

    Your program have an infinite loop, check your loop body. What counts the loop.
    Tjones787

  3. #3
    Member andbin's Avatar
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    Default Re: string length problem

    Quote Originally Posted by ma5sacre View Post
    but even if I made sure to enter exactly 11, it still said " number must be 11 digits long. " What am I doing wrong?
    Simply that when you are into the loop, the numberlength variable is not updated.
    Andrea, www.andbin.net SCJP 5 (91%) SCWCD 5 (94%)

    Useful links for Java beginners My new project Java Examples on Google Code

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    ma5sacre (February 3rd, 2014)

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    Default Re: string length problem

    Please check for the above advise provided. If you still have issues then please can you post your input, output and error(if received) for this program.
    Thanks and regards,
    Sambit Swain

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    Super Moderator Norm's Avatar
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    Default Re: string length problem

    What am I doing wrong?
    Try debugging the code by printing out the value of numberlength after it is assigned a value so you can see what the computer sees. Seeing the output should help you find what you are doing wrong.
    If you don't understand my answer, don't ignore it, ask a question.

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    ma5sacre (February 3rd, 2014)

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    Default Re: string length problem

    Thanks guys! I forgot you have to update the numberlength variable in the loop. Should work fine now!

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