HDU 1042 N!

N!

Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)
Total Submission(s): 75324    Accepted Submission(s): 21992

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）

 

 

 

解析：大数。

 

 

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

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