Write a Program in C++ That Do Iterative Function Factorial

// Iterative function factorial.

#include <iostream>

#include <iomanip>

using namespace std;

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

int main()

{

   // calculate the factorials of 0 through 10

   for ( unsigned int counter = 0; counter <= 10; ++counter )

      cout << setw( 2 ) << counter << "! = " << factorial( counter ) 

         << endl;

} // end main

// iterative method factorial

unsigned long factorial( unsigned int number )

{

   unsigned long result = 1;

   // iterative factorial calculation 

   for ( unsigned int i = number; i >= 1; --i )

      result *= i;

   return result;

} // end function factorial