[백준] 10872번 : 팩토리얼 - Java(자바)

https://www.acmicpc.net/problem/10872

import java.util.Scanner;
public class Main {
    public static void main(String args[]) {
      Scanner s=new Scanner(System.in);
      int a=s.nextInt();
      int num=1;
      if(a==0) System.out.println(num);
      else{
          for(int i=1;i<=a;i++){
              num=num*i;
          }
          System.out.println(num);
      }
    }
}