N!

1
2
3

1
2
6

import java.util.Scanner;
import java.math.BigInteger;


public class yhrtr {

	public static void main(String[] args) {
		Scanner cin = new Scanner (System.in);
			 
		while(cin.hasNext())
		{
			BigInteger  s = BigInteger.ONE;
			int n = cin.nextInt();
			for(int i=1;i<=n;i++)
				s = s.multiply(BigInteger.valueOf(i));
			
			System.out.println(s);
		}
	}
}

HDUJ 1042 N!,布布扣,bubuko.com

HDUJ 1042 N!

原文：http://blog.csdn.net/hyccfy/article/details/38230899