Example of exact value of factorial in c language

#include <stdio.h>
#include <string.h>
const int maxn = 3000;
int f[maxn];
int main()
{
 int i,j,n;
 scanf("%d",&n);
 memset(f,0,sizeof(f));
 f[0] = 1;
 for(i = 2;i <= n;i++)
 {
  int c = 0;
  for(j = 0;j < maxn;j++)
  {
   int s = f[j] * i + c;
   f[j] = s % 10;
   c = s / 10;
  }
 }
 for(j = maxn - 1;j >= 0;j--) if(f[j]) break;
 for(i = j;i >= 0;i--) printf("%d",f[i]);
 printf("n");
 return 0;
}