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Thread: Hi new to java trying to do something new :) any help would be appreciated!

  1. #1
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    Default Hi new to java trying to do something new :) any help would be appreciated!

    hi, I am trying to complete the following task (purely for fun) I would really appreciate it if someone could adapt my code:

    Write an a Java application which prints a diamond in a
    square grid of dots whose side length is input to the
    application. The side of the square must be an odd
    number. If the input data is invalid an error message is
    output. For example, if the input data was 10 then the
    error message
    Size (10) invalid must be odd
    would be printed. If the input data was -5 then the error
    message
    Sides of square must be positive
    would be printed

    Here is my code i have got:
    public class Stars
    {
    public static void main(String[] args)
    {
    System.out.println("Enter size of Diamond");

    System.out.println();
    int longestRow = BIO.getInt();

    for(int row=1 ; row<=longestRow ; ++row)
    {
    int i = (2*row) - 1;
    if(i>longestRow) i = 2*(longestRow-row+1) - 1;
    for(int j=0 ; j<(longestRow-i)/2 ; ++j) System.out.print(".");
    for(int j=0 ; j<i ; ++j) System.out.print("*");
    for(int j=0 ; j<(longestRow-i)/2 ; ++j) System.out.print(".");
    System.out.println();
    }
    }
    }

    this looks like this when ran:
    5
    ..*..
    .***.
    *****
    .***.
    ..*..

    I am trying to make it look like this:
    ..*..
    .*.*.
    *...*
    .*.*.
    ..*..

    Thanks Gareth


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Hi new to java trying to do something new :) any help would be appreciated!

    What are the rules for the number of leading .s, middle *s and trailing .s for each row that you print?
    Write the the rules for each row and see what the pattern is that you can use to print the correct number of characters on each row.

  3. #3
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    Default Re: Hi new to java trying to do something new :) any help would be appreciated!

    Hey,

    Hi,

    I am also new to this. I also appreciate if you guys will help me.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Hi new to java trying to do something new :) any help would be appreciated!

    You need to do some work with a paper and pencil to get a design for your program.
    I suggested in post#2 a way to look at the problem.
    For each line/row you need to see how many of each character is printed and in what order and then see what the relationship is to what row you are printing on.

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