package AufgabenBiel;

import javakara.JavaKaraProgram;

public class Fibonnaci extends JavaKaraProgram{
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Fibonnaci obj = new Fibonnaci();
        obj.run();
    }

    public void myMainProgram() {
        // Initialize the Message text
        String text = "";

        // Calculate the fibonacci numbers for 1 to 10 and append them to the text variable
        for (int i=1; i<=10; i++) {
            try {
                text = text + "Fib("+i+")"+"="+ fibonacci(i) + "\n";
            } catch (Exception e) {
                // Print the error Message if something goes wrong
                // (It should not go wrong as long as you don't change the program)
                tools.showMessage(e.getMessage());
            }
        }
        // Show all calculated fibonacci numbers
        tools.showMessage(text);
    }

    public int fibonacci(int n) throws Exception {
        // Calculates the Fibonacci number for n
        if (n < 1) {
            // Throw an exception if function is not defined
            throw new Exception("This function is not defined for values less than one.");
        }
        if (n==1 || n==2) {
            // Function is defined as being 1 for values 1 and 2
            return 1;
        }
        else {
            // Recursively calculate the value
            int x = fibonacci(n-1)+fibonacci(n-2);
            return(x);
        }
    }
}