获取阶乘n！的最后一个非零数字

#include 
using namespace std;

unsigned LastNotZeroDigit[1000];
long long Factorial[100];

unsigned CleanLastZeros(unsigned num);	//清除数字后面的0
unsigned GetLastNotZeroDigit(unsigned num);	//获取数字的最后一位非零数字
unsigned GetLastNotZeroDigitOfFactorial(unsigned n);	//获取n!的最后一位非零数字
long long GetFactorial(unsigned n);	//计算n!

int main(int argc, char* argv[])
{
	for(unsigned i=0; i<20; i++)
	{
		cout<