Factorial of large numbers bjfu1005 java实现大数阶乘

描述
Factorial, as we all know, is the product of all the positive integers from one up to and including a given integer. For example, factorial zero is assigned the value of one; factorial
four is 1 × 2 × 3 × 4. Symbol: N! The N is the given integer. But it is hard to calculate the factorial when the N is large. Ben wrote a program to calculate N!(N<10000) when he was in grade one. So try it!

输入
The input consists of multiple test cases. One N (0<=N<=10000,integer) in a line for each test case. Process to the end of file.
输出
For each test case, print the value of N! in a single line.
样例输入
5

10

20

100
样例输出
120

3628800

2432902008176640000

93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000

import java.math.BigInteger;
import java.util.Scanner;
public class Main {
public static void main(String args[]){
Scanner cin=new Scanner(System.in);
int i;
while (cin.hasNext()){
i=cin.nextInt();
getBigFactorial(i);
}
cin.close();
}
public static void getBigFactorial(int n) {
if (n==0)
System.out.println("0");
BigInteger result=new BigInteger("1");
for (;n>0;n--)
result=result.multiply(new BigInteger(n+""));
System.out.println(result);
}
}

我的症结还在于，不会熟练的在int和Biginteger之间转换。。