第7周作业1-循环大战

import java.util.Scanner;


public class FactorialTest {
    
     public static int run(int n){
          if (n == 1) {
                 return n;
                }else {
           return n * run( n - 1 );
          }
         }

    public static void main(String args[]){
        System.out.println("请输入需要求阶乘的数字(请输入一个整数):");
        Scanner in = new Scanner(System.in);
        int a = Integer.parseInt(in.nextLine());
        System.out.println(run(a));
    }
}