java语言的科学与艺术-编程练习Hailstone

/*
 * File: Hailstone.java
 * Name: 
 * Section Leader: 
 * --------------------
 * This file is the starter file for the Hailstone problem.
 */

import acm.program.*;

public class Hailstone extends ConsoleProgram {
    public void run() {
        println("This program show the Hailstone sequence.");
        int n = readInt("Enter a postive number: ");
        int m = 0;
        int i = 0; // this is count
        while(n != 1){
            if(n % 2 == 0){
                m = nIsEven(n);
                println(n + " is even so I take half: " + m);
                n = m;
                i++;
            } else {
                m = nIsOdd(n);
                println(n + " is odd, so I male 3n + 1: " + m);
                n = m;
                i++;
        }
        }
        println("The process took " + i + " to reach 1");
    }
    
    /* 
     * If n is even, take half.
     */
    private int nIsEven(int n){
        return n / 2;
    }
    
    /*
     * If n is odd, make 3n + 1.
     */
    private int nIsOdd(int n){
        return 3*n + 1;
    }
}