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Thread: Building a triangle using strings and loops...program trouble.

  1. #1
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    Default Building a triangle using strings and loops...program trouble.

    Hi all, I have a project that I've been trying to do where you need to create a triangle using String objects as well as loops.

    The end result has to look like this: (the triangle needs to be complete at the bottom line but I can't get it to turn out right on this message board)

         *
        * *
       *   *
      *     *
     ******

    We are given the example using this code:

    public class Triangle {
     
        public static void main(String[] args) {
     
            int length = 16;
     
            String border = new String(""); //declaring string object named border
     
            for(int n = 1; n <= length; n++)
            {
                border+='*';
            }
     
           //***************************************
     
            String spaces = new String("");
     
            for(int n = 1; n <= border.length()-2; n++)
            {
                spaces+=' ';
            }
     
            //****************************************
     
            int slength = 2;
     
            String sides = new String("");
     
            for(int n = 1; n <= slength; n++)
            {
                sides+='*' + spaces + "*\n";
            }
     
     
        String box = border + '\n' + sides + border + '\n';
     
        System.out.println(box);
     
        }
    }


    I have no clue how get each row to descend by one space. It's really confusing me logically especially since for loops are involved.

    This is what I have so far... even though it's not much.
    public class Triangle2 {
     
     
        public static void main(String[] args) {
     
     
           int length = 1;
     
           String tip = new String("");
     
           for(int n=1; n<=1; n++)
           {
               tip+='*';
           }
           //******************************************
     
           System.out.println(tip);
     
     
           String spaces = new String("");
     
           for(int n=1; n<=1; n++)
           {
     
           }
     
     
        }
    }

    Any help would be appreciated!


  2. #2
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    Default Re: Building a triangle using strings and loops...program trouble.

    You are most likely going to want to use nested for loops rather than separate loops.

  3. #3
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    Default Re: Building a triangle using strings and loops...program trouble.

    I understand that, but I'm confused about how to go about it. What I don't understand is that if I create a string object called spaces, how do I get it to string.length() the previous line as it builds and then add 1 space to that? I believe my logic is correct but unsure of how to set it up.

    I'm also working on another project where you have to build a rocket ship, which I have the sides but the top and bottom need to be triangles which I cannot figure out the spacing.

    This is what I have so far... (it needs to look like the top-ish part, the code below I wrote only does the sides.)

     
        /\
      /   \
    /      \
    +------+
    |       |
    |       |
    +------+
    |       |
    |       |
    +------+
    |       |
    |       |
    +------+
       /   \
     /      \
    /        \
     
     
    public class RocketShip {
     
     
        public static void main(String[] args) {
     
     
            String topbox = new String("");
     
            for(int n=1; n<=8; n++)
            {
                if(n==1 || n==8)
                {
                    topbox+="+";
                }
                else
                {
                    topbox+='-';
                }
            }
     
     
            String spaces = new String("");
            for(int n = 1; n<=topbox.length()-2; n++)
                spaces += ' ';
     
     
     
            String sides = new String("");
            for(int n = 1; n<=2; n++)
            {
             sides += '|' + spaces + "|\n";
     
            }
            System.out.println(topbox + '\n' + sides + topbox + '\n' 
                    + sides + topbox + '\n' + sides + topbox);
     
        }
    }
    Last edited by orbin; June 13th, 2012 at 04:49 PM.

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