java 大数阶乘代码

import java.io.*;  import java.math.BigInteger;  import java.util.*;  public class Main  {  public static void main(String args[])  {  Scanner cin = new Scanner(System.in); while(cin.hasNext()){int n = cin.nextInt();  BigInteger ans = BigInteger.ONE;  for(int i = 1; i <= n; ++i)  ans = ans.multiply(BigInteger.valueOf(i));  System.out.println(ans);  }  }}