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Thread: nested do while loop

  1. #1
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    Question nested do while loop

    I am very new at java and just trying to learn it on my spare time and I'm doing do-while loops and I am having trouble understanding the below code if somebody could help me out that would be great.


    public class help {
    public static void main (String args[])
    throws java.io.IOException {
    char choice, ignore;
    do{
    System.out.println ("Choose one:");
    System.out.println("1. if");
    System.out.println("2.switch");

    choice = (char) System.in.read();
    do{
    ignore = (char) System.in.read();
    }while(ignore != '\n');
    }while (choice < '1'| choice >'2');

    switch(choice){
    case '1':
    System.out.println("if");
    break;
    case '2':
    System.out.println("switch");
    break;
    }
    }
    }

    Whats the point of the block?
    do{
    ignore = (char) System.in.read();
    }while(ignore != '\n');

    It makes no difference in the program wither i delete this block or keep it

    Also can somebody explain how while (choice < '1'| choice >'2'); translates? I would assume it would be while (choice >= '1'| choice =<'2');?


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    Default Re: nested do while loop

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