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- - Problem With Program [solved] (http://www.programmingforums.org/showthread.php?t=1106)

Progejad

Nov 11th, 2004 8:07 AM

I have to do program which calculates x and y couples using next formulas:

x=(40*cos)+60*Math.cos((2/3)*t);

y=(40*sin)-60*Math.sin((2/3)*t);

the output of the program should look something like this:

x | y

1234 | 3456 // x and y results
2234 | 8923
1256 | 9842

"t" should change after 0,01 step (from -10 to 10)
(So in output there should be 2000 couples of x and y + first line x|y)

I tried to program but got only more confused after hours of trying...biggest problem is that "step" thing...and that "t" should change after every step...
I hope there's anyone that could help me ...

Infinite Recursion

Nov 11th, 2004 10:12 AM

Sounds easy enough... Since this is a homework assignment, I'd like to see effort (code) on your end before I contribute code.

The "step" problem, would be a loop with an index variable that increments through from -10 to 10.

Progejad

Nov 12th, 2004 4:39 AM

/*at the end my code was like that, but x and y were not right (maybe i did something wrong with x and y calculating
http://www.itcollege.ee/~kkoemets/kodused2...l_51b41c47.gif- x and y should be like that*/

//starting my code:   



    public class Hindeline1 {



    public static void main (String [] args) {   



    double x;

    double y;

   

    

    double t;

        



        for (t = -10; t <= (10); t +=0.01) 

        {

        

        double sin=Math.sin(t);

    double cos=Math.cos(t);

        

        x=(40*cos)+60*Math.cos((2/3)*t);

   

    y=(40*sin)-60*Math.sin((2/3)*t);

   

        

        System.out.println (x+ "|" +y);

        }

        }



}//End of code

drunkenCoder

Nov 13th, 2004 2:29 AM

looks like you got it right to me ... what you wrote calculates x & y correctly (going by the formula you have provided)

Infinite Recursion

Nov 13th, 2004 12:51 PM

Looks good. The code achieves your 2000+1 lines of output.
Drunken coder has confirmed the value is correct... you can plug them into a
calculator to confirm further if needed.

public class Hindeline1

{

 public static void main (String [] args)

 {

   double x;

   double y;

   double t;



   for (t = -10; t <= 10; t += 0.01)

   {

    double sin=Math.sin(t);

    double cos=Math.cos(t);



    x = (40 * cos) + 60 * Math.cos((2/3)*t);

    y = (40 * sin) - 60 * Math.sin((2/3)*t);



    System.out.println(x + " | " + y);

   }

 }

}

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