[projecteuler]Factorial digit sum

题目：http://projecteuler.net/problem=20

代码：

import java.math.BigInteger;

public class Main{
public static void main(String args[])
{
BigInteger b = new BigInteger("1");

BigInteger temp = new BigInteger("2");

for(int i=2; i<=100; i++)
{
temp = BigInteger.valueOf(i);
b = b.multiply(temp);
}
int res = 0;
BigInteger qu[] = new BigInteger[2];
while(b.compareTo(new BigInteger("0")) != 0 )
{
qu = b.divideAndRemainder(new BigInteger("10"));
res += qu[1].intValue();
b = qu[0];
}

System.out.println(res);
}
}