For循環法（非遞歸）求階乘

package com.tedu;

import java.util.Scanner;
/**
 * 需求:for循環法（非遞歸）求階乘
 * @author CGB
 *
 */
public class Test02FDGJC {
	public static void main(String[] args) {
		System.out.print("請輸入一個整數：");
		double x = new Scanner(System.in).nextDouble();
		f(x);
		System.out.println(x+"的階乘爲:"+f(x));
	}

	private static double f(double x) {
		for (double i = x-1; i >0; i--) {
			x=x*i;
		}
		return x;
	}
}