N！Again

WhereIsHeroFrom:             Zty, what are you doing ?
Zty:                                     I want to calculate N!......
WhereIsHeroFrom:             So easy! How big N is ?
Zty:                                    1 <=N <=1000000000000000000000000000000000000000000000…
WhereIsHeroFrom:             Oh! You must be crazy! Are you Fa Shao?
Zty:                                     No. I haven‘s finished my saying. I just said I want to calculate N! mod 2009


Hint : 0! = 1, N! = N*(N-1)!

 

Each line will contain one integer N(0 <= N<=10^9). Process to end of file.

 

For each case, output N! mod 2009

 

 

 1 #include <stdio.h> 2 #include <stdlib.h> 3 int main()  4 { 5     int n; 6     int ans,i; 7     while(~scanf("%d",&n)) 8     { 9         ans=1;10         if(n>=2009)11             printf("0\n");12         else13         {14             for(i=1;i<=n;i++)    15             {16                 ans*=i;17                 ans%=2009;18             }19             printf("%d\n",ans);    20         }21     }22     return 0;23 }