HailStone

/*
 * File: Hailstone.java
 * --------------------
 * This program is a stub for the Hailstone problem, which computes
 * Hailstone sequence described in Assignment #2.
 */

import acm.program.*;

public class Hailstone extends ConsoleProgram {

    public void run() {
        println("This program shows the Hailstone sequence ");
        println("and tells you how many steps it takes to reach the number 1");
        println("");
        int n=readInt("Enter a possitive integer:");
        int numberOfSteps=0;//keeps track of the number of steps, starts at 0
        if (n==1){
            println("Seriously...");
        }
        if (n==0){
            println("Ahh!!! ERROR!! ERROR!! ERROR!!");
            n=1;
        }
        while (n!=1){//will do this until n becomes 1
            if (n%2==0){//checks to see if n is even.
                int n1=n;//n1 saves the value of integer 'n' before it changes again
                n/=2;//takes half of n if n is even
                println(n1+" is even so take half:"+n);
                println("");
            } else {
                int n1=n;
                n=n*3+1;// if n is odd, it multiplies it by three and adds 1
                println(n1+" is odd so I make 3n+1:"+n);
                println("");
            }
            numberOfSteps++;
        }
        println("This process took " +numberOfSteps+ " steps to reach 1.");
    }
}