递归

package zaiyang.method;

public class Demo05 {
       //递归思想
    public static void main(String[] args) {
        System.out.println(f(9));
    }


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