/****** 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 N; while(true) { System.out.print("Inout n (0 <= n >=16):"); N=keyboard.nextInt(); if(N==999) break; if(N<=0 || N>=16) continue; System.out.printf("%d 的階乘(尾端遞迴) = %d\n",N,fac(N,1)); System.out.printf("%d 的階乘(迴圈) = %d\n",N,loop(N,1)); } } public static int fac(int a,int b) { if(a==0) return b; return fac(a-1,b*a); } public static int loop(int a,int b) { while(a>0) { b=b*a; a=a-1; } return b; } }
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