C6X5_Fib.java

//Fib.java      MrG     2012.0109
public class Fib
{
    /*
        private instance fields
        aka private parts
        aka naughty bits
    */
    private double older;
    private double old;
    private double fNew;

    /**
        Constructor: initialize first 2 values of fib seq
        @param first = fib(1)
        @param second = fib(2)
    */
    public Fib(int first, int second)
    {
        older = first;
        old = second;
    }
    /**
        Mutator: find fib(n) using fib(n-1) for all n>2
    */
    public void nextFib()
    {
        fNew = old + older;
        older = old;
        old = fNew;
    }

    /**
        Accessor: what is the current fib value
        @return fib(n)
    */
    public double getFib()
    {
        return fNew;
    }

    /**
        Accessor: ratio of fib(n)/fib(n-1) for limit
        @return fib(n)/fib(n-1)
    */
    public double getRatio()
    {
        return old/older;
    }


}