401 遞迴階乘計算

import java.util.Scanner;
public class JPA401 {

    static Scanner keyboard = new Scanner(System.in);
    public static void main(String args[]) {

        int input=0;
        System.out.println("Input n(0<=n<=16)");
        input=keyboard.nextInt();
        while(input!=999){
        System.out.println(input+"的階層 = "+k(input));
        System.out.println("Input n(0<=n<=16)");
        input=keyboard.nextInt();
        }
    }
static int k(int x){

if(x>1){
return x*k(x-1);
}
else{
return 1;
}

}
}