【HDU】1042 - N!（java - BigDecimal）

点击打开题目

N!

Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others) Total Submission(s): 74697 Accepted Submission(s): 21717

Problem Description

Given an integer N(0 ≤ N ≤ 10000), your task is to calculate N!

Input

One N in one line, process to the end of file.

Output

For each N, output N! in one line.

Sample Input

   1
2
3

Sample Output

   1
2
6

Author

JGShining（极光炫影）

用java算大数真的很方便啊！

代码如下：

import java.math.BigDecimal;
import java.util.Scanner;

public class Main
{
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		while (sc.hasNext())
		{
			int n = sc.nextInt();
			BigDecimal ans=new BigDecimal(1);
			for (int i = 2 ; i <= n ; i++)
			{
				BigDecimal t = new BigDecimal(i);
				ans = ans.multiply(t);
			}
			System.out.println(ans);
		}
	}
}