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);
}
}
}