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Thread: 1, 4, 9, 16 sequence

  1. #1
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    Default 1, 4, 9, 16 sequence

    i'm new to java and i'm trying to make number sequence with one TextArea and one Button, using '\n' and '\t'
    the result should look like this:
    1 1 1
    2 3 4
    3 5 9
    . . .
    . . .
    . . .
    15 29 225

    i got the first two columns but i need help with the third
    import java.applet.Applet;
    import java.awt.*;
     
    public class talnarod extends Applet
    {
    	TextArea Ttafla;
    	Button Bstart;
    	int i, a, b, c;
     
    	public void init()
    	{
    		Bstart = new Button("Start");
    		Ttafla = new TextArea(15,25);
     
    		this.add(Bstart);
    		this.add(Ttafla);
    	}
    	public boolean action(Event e, Object o)
    	{
    		if (e.target == Bstart)
    		{
    			for (a=1; a <= 15; a++) //here i set the length of the sequence 1 to 15
    			{
    				b = a+a-1; //odd numbers for second column
    				c = 1; //and here i need help !!!
    				Ttafla.appendText("" + a + '\t' + b + '\t' + c + '\n');
    			}
    			return true;
    		}
    		return false;
    	}
    }
    Last edited by mattisvan; March 15th, 2013 at 07:15 AM. Reason: [SOLVED]


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: 1, 4, 9, 16 sequence

    i need help with the third
    What values go in the third column? How does the value relate to the row its on?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: 1, 4, 9, 16 sequence

    i think it's solved ?
    column3 starts at 0 before it enters the loop, than column3 + column2
    import java.applet.Applet;
    import java.awt.*;
     
     
    public class talnarod extends Applet
    {
     
    	TextArea Ttafla;
    	Button Bstart;
    	int a, b, c;
     
    	public void init()
    	{
     
    		Bstart = new Button("Start");
    		Ttafla = new TextArea(15,25);
     
    		this.add(Bstart);
    		this.add(Ttafla);
    	}
    	public boolean action(Event e, Object o)
    	{
    		if (e.target == Bstart)
    		{
    			c = 0;					
    			for (a=1; a <= 15; a++)		
    			{
    				b = a+a-1;				
    				c = c+b;				
     
    				Ttafla.appendText("" + a + '\t' + b + '\t' + c + '\n');
     
    			}
    			return true;
    		}
    		return false;
    	}
    }

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: 1, 4, 9, 16 sequence

    If its solved, please mark this thread as solved.
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: 1, 4, 9, 16 sequence

    Quote Originally Posted by Norm View Post
    If its solved, please mark this thread as solved.
    how, were do i mark it as solved ?

    sorry, solved problem is solved

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