fig05_17.cpp

// fig05_17.cpp
// Iterative function factorial.
#include <iostream>
#include <iomanip>
using namespace std;

long factorial(int number); // function prototype

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

// iterative method factorial
long factorial(int number) {
   long result{1};

   // iterative factorial calculation 
   for (int i{number}; i >= 1; --i) {
      result *= i;
   }

   return result;
} 



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