【HDU】1042 - N!（java - BigDecimal）

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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);
}
}
}