/**
 * Write a description of class testing here.
 *
 * @author (Wallace Quach)
 * @version (01/25/2010)
 * @TA (Arjun)
 */
import java.util.Scanner;

public class testing
{
    public static void main(String[] args){

        final int RAB_INT = 500; // initial number of rabbits
        final int WOLF_INT = 38; // initial number of wolves
        final double RAB_G_INCR = 0.12; // Rabbit population growth in isolation
        final double WOLF_G_DECR = 0.10; // Wolf population rate of decrease
        final double RAB_POP_RA_DECR = 0.0024; // Rate of rabbit decrease due to wolves
        final double WOLF_POP_RA_INCR = 0.0002; // rate of increase of wolves due to rabbits

        int months = 0;
        int currentMonth = 0;
        int currentWolves;
        int currentRabbits;
        int newWolves;
        int newRabbits;


        System.out.println("Author: Wallace Quach");
        System.out.println("Assignment: #1, Wolfs and Rabbits");
        System.out.println("TA: Arjun Mukherjee Wednesday, 8:00-8:50 AM");
        System.out.println();
        System.out.println();
        System.out.println("This program models changing population of rabbits and" + "\n" + "wolves, given starting figures.");
        System.out.println();
        System.out.println();
        System.out.print("For how many months would you like to run the simulation? ");

        Scanner keyboard = new Scanner(System.in);
        months = keyboard.nextInt( );
        System.out.println();
        System.out.println("Month");

        currentRabbits = RAB_INT;
        currentWolves = WOLF_INT;


        while( currentMonth <= months ){
            System.out.print(currentMonth);

            int tempWolves = currentWolves / 13;
            int tempRabbits = currentRabbits / 13;

            while( tempRabbits >= 0 ) {
                if( tempWolves == 0 ){
                    System.out.print("W");
                }
                if( tempRabbits == 0 ){
                    System.out.print("R");
                }

                System.out.print(" ");

                tempRabbits--;
                tempWolves--;
            }

            newRabbits = (int) (currentRabbits * (1 + RAB_G_INCR - RAB_POP_RA_DECR * currentWolves));
            newWolves = (int) (currentWolves * (1 - WOLF_G_DECR + WOLF_POP_RA_INCR * currentRabbits));

            currentWolves = newWolves;
            currentRabbits = newRabbits;

            //System.out.println("Rabbits: " + currentRabbits + " ; Wolves: " + currentWolves);
            System.out.println();
            currentMonth++;
        }
        System.out.println();
        System.out.println("Tasmanian Devil ate " + (currentRabbits + currentWolves) + " total.");
      }
    }