HDU 1042 N!(大数阶乘)

　　　　　　　　　　　　　　　　　　N!

 

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

 

代码:

#include<cstdio>
using namespace std;

int main()
{
    int i,n,digit,temp,carry,j;
    int a[40005];
    while(scanf("%d",&n)!=EOF)
    {
        a[0]=1;
        digit=0;
        for(i=2;i<=n;i++)
        {
            for(carry=0,j=0;j<=digit;j++)
            {
                temp=a[j]*i+carry;
                a[j]=temp%10;
                carry=temp/10;
            }
            while(carry)
            {
                a[++digit]=carry%10;
                carry/=10;
            }
        }
        for(i=digit;i>=0;i--)
        printf("%d",a[i]);
        printf("\n");
    }
    return 0;
}