factorial2.java

《算法设计与分析》王晓东编著

import java.util.*;
public class Factorial2 {
		public static int Factorial(int n){
			if(n>1) return n*Factorial(n-1);
			else return 1;
		}
		public static void main(String args[]){
			Scanner in = new Scanner(System.in);
			System.out.print("Please input an integer to caculate its Factorial:");
			int n=in.nextInt();
			System.out.println(n+"! = "+Factorial2.Factorial(n));
		}
}