java_2018_Day15_乘阶(for)

import java.util.Scanner;
class xuanze{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int jc = 1;
        System.out.println("请输入一个数值");
        int shu = sc.nextInt();
        //for(int x=1;x<=shu;x++){ 1*数都等于1,可以从2开始
        for(int x=2;x<=shu;x++){
            jc *=x;
        }
        System.out.println(shu+"的阶乘="+jc);
    }
}