// Fig. 6.32: fig06_32.cpp
// Testing the iterative factorial function.
#include <iostream>
#include <iomanip>
using namespace std;

unsigned long factorial( unsigned long ); // function prototype

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

// 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



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