hdu 1042 N! java大数及判断文件末尾

N!

Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)
Total Submission(s): 73503    Accepted Submission(s): 21308

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）

 

import java.io.*;
import java.math.BigInteger;
import java.util.*;
public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
         Scanner cin=new Scanner (new BufferedInputStream(System.in));
            PrintWriter cout=new PrintWriter(System.out);
            int t;
            //t=cin.nextInt();
            //int eg=1;
            while(cin.hasNextInt())
            {
                t=cin.nextInt();
                BigInteger one=new BigInteger("1");
                BigInteger ans=one;
                BigInteger tmp =one;
                for(int i=0;i<t;i++){

                    ans=ans.multiply(tmp);
                    tmp=tmp.add(one);
                }
                //System.out.println(ans);
                System.out.println(ans);

            }
    }

}

直接java大数，注意要读到文件末尾就行。