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Thread: Fibonacci generator and gives the number back as output

  1. #1
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    Default Fibonacci generator and gives the number back as output

    I have a program that i need to complete. I wrote the first one (FibonacciGenerator) with stated variables - everything worked fine
    I now want to split it up so that the user can give a number and the program gives the correct number back. (ie, fib(5)=5 AND NOT fib(5)=2)
    Please help as I know what i need to do but the how escapes me.

    constructor portion
      /*
       Class used to generate a Fibonacci number with a given input
    */
        public class FibonacciGenerator
       {
       /**
          Construct a FibonacciGenerator object to
             generate a Fibonacci number
       */
           public FibonacciGenerator()
          {
             initialize();
          }
     
       	/**
       	Initializes the FibonacciGenerator object. Allows
       	the object to be reset and reused.
       	*/   	
     
           public void initialize()
          {
             fold1 = 1;
             fold2 = 1;
             fnew = 1;
             count = 0;
          }   
       /**
          Method used to calculate a fibonacci number
          @return fnew the fibonacci number
       */
           public int nextNumber()
          {
             if(count < 2)
             {
                count++;
                return 1;
             }
             else
             {
               	fnew = fold1 + fold2;
     
                fold2 = fold1;
                fold1 = fnew;
     
                return fnew;
             }
          }
     
          private int fold1;
          private int fold2;
          private int count;
          private int fnew;
       }

    Test Program (I know i need to return the input to the constructor file but how??)
      import javax.swing.JOptionPane;
     
    /**
       Test driver class for FibonacciGenerator class
    */
    public class FibonacciGeneratorTester
    {
       public static void main(String[] args)
       {
          String input = JOptionPane.showInputDialog(
             "Enter a Number or hit ''Cancel'' to exit:");
          int n = Integer.parseInt(input);
     
          FibonacciGenerator fg = new FibonacciGenerator();
     
          int next = n;
     
          if (n < 2)
             next = 1;
          else
          {
             for (int i = 3; i <= n; i++)
             {
                next = fg.nextNumber();
             }
          }
     
          System.out.println("fib(" + n + ") = " + next);
     
          System.exit(0);
       }
    }

    Any help is appreciated


  2. #2
    Senile Half-Wit Freaky Chris's Avatar
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    Default Re: help with FibonaccciGenerator

    Welcome to Java Programming Forums, Aurora.

    Have a read of this, a previous topic about the fibonacci sequence see if it helps you out. If it doesn't then get back to us and I'll have a proper look over your code.

    http://www.javaprogrammingforums.com...-sequance.html

    Regards,
    Chris
    chris[at]javaprogrammingforums[dot]com

    Prifysgol Bangor University, North Wales