public class Test01 {
public static void main(String[] args) {
System.out.print("请输入要求数的阶层:");
Scanner input = new Scanner(System.in);
int num = input.nextInt();
int sum = m1(num);
System.out.println(num+"的阶层是" + sum);
}
public static int m1 (int num) {
if (num == 1) {
return 1;
}
return num*m1(num-1);
}
}