n的阶乘

import java.util.Scanner;
//求n的阶乘
public class Factorial {
public static int factorial(int n){
if(n == 1){
return 1;
}
return n* factorial(n-1);//factorial 函数调用自己
}
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int i = scanner.nextInt();
factorial(i);
int ret = factorial(i);//设置一个返回值，返回factorial的函数值
System.out.println("ret = "+ ret);
}
}