403尾端遞迴次方計算

/******
檔名：JPA04.java
題目：TQC+ JAVA6物件導向程式設計 參考答案
時間：2015/06
作者：fang shi mai
******/
import java.util.Scanner;

public class JPA04
{
    static Scanner keyboard = new Scanner(System.in);
    
    public static void main(String args[])
    {
        int m,n;
        
        while(true)
        {
            System.out.print("Input m:");
            m=keyboard.nextInt();
            if(m==999)
                break;
            System.out.print("Input n:");
            n=keyboard.nextInt();
            
            System.out.println("Ans (尾端遞迴) : "+fac(m,n,1));
            System.out.println("Ans (迴圈) : "+loop(m,n,1));
        }
    }
    public static int fac(int a,int b,int c)
    {
        if(b==0)
            return c;
        return fac(a,b-1,c*a);
    }
    public static int loop(int a,int b,int c)
    {
        while(b>0)
        {
            c=c*a;
            b--;
        }
        return c;
    }
}