hdu 1042

高精度阶乘

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
const int maxn=50000; 
int s[maxn];
int n;
int main()
{
	while(cin>>n)
	{
		int i,j,t,k;
		memset(s,0,sizeof(s));
		s[0]=1;
		int c,l=1;
		if(n==0||n==1) printf("1");
		else 
		{
			for(i=2;i<=n;i++)
			{
				c=0;
				for(j=0;j<l;j++)
				{
					int tem=s[j]*i+c;
					s[j]=tem%10;
					c=tem/10;
				}
				while(c)
				{
					s[l++]=c%10;
					c/=10;
				}
			}
			for(i=l-1;i>=0;i--) printf("%d",s[i]);
		}
		printf("\n");
	}
	return 0;
}

转载于:https://www.cnblogs.com/lj030/archive/2013/01/25/3002225.html