#include<iostream>
#include <iomanip>
using namespace std;

// iterative method factorial
unsigned long factorial( unsigned long number )
{
   unsigned long result = 1;

   // iterative factorial calculation 
   for ( unsigned long i = number; i >= 1; i-- )
      result *= i;

   return result;
} // end function factorial



int main()
{
   // calculate the factorials of 0 through 10
   for ( int counter = 0; counter <= 25; counter++ )
      cout << setw( 2 ) << counter << "! = " << factorial( counter ) 
         << endl;
   system("pause");
   return 0;
} // end main