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Thread: VERY basic question - if loop

  1. #1
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    Default VERY basic question - if loop

    Hello everyone,

    I started studying Java today and couldn't understand why this code would give the result bellow it:

    INPUT:
    public class SimpleLoop {
     
            public static void main(String[] args) {                
                    for(int i=0; i<20; i++) {
                            for(int j=0; j<i; j++) {
                                    System.out.print(" ");
                            }
                            System.out.println("*");
                    }
            }
    }
    OUTPUT:

    *
    (1 space) *
    (2 spaces) *
    (3 spaces) *
    (4) *
    (5) *
    and so on...


    there is no instruction for how many (' ') (space) to type before the ('*').
    I mean, shouldn't it be like this?

    *
    (1 space) *
    (1 space)*
    (1 space) *
    (1 space)*
    and so on...?


    In the first run - no space, but from the second - there is space, but only one.... isn't it?



    Thanks for helping...
    Kobi.
    Last edited by helloworld922; October 12th, 2011 at 06:26 PM.


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: VERY basic question - if loop

    Take a look at the nested loop. It's printing out the number of spaces depending on which line you're on.

    So the first line has no spaces, the second line has 1 space, and so on and so forth.

  3. #3
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    Default Re: VERY basic question - if loop

    But isn't the 'j' symbolize the number of repetitions and not the number of the spaces...?

    if i=4 and j=3 isn't it should print only one space as i ordered it?

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    Default Re: VERY basic question - if loop

    ohhhhhh!!!!
    i got it now...!

    the nested "if" keep running before it goes another round of the "main if"...


    thanks!

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