SOURCE FILE: 7.04MakeFactorials.cpp

// Example 7.4. Program to print factorials for integers 0-16   
   
#include <iostream.h>
#include <iomanip.h>
      
int main(void)   
{   
   double factorial(int n);   

   const int MAX_INDEX = 16;   
   
   cout << " Table of Factorials\n";
   cout << "Number        Factorial\n";
   cout << "------        ---------\n\n";
   
   for (int n = 0; n <= MAX_INDEX; n++)   
      cout << setw(4) << n << setiosflags(ios::fixed)
           << setw(19) << factorial(n) << endl;

   return 0;
}   
   
//   
// Function to return the factorial of a parameter as a double   
// Pre:  n is a nonnegative integer.   
// Post: n! was returned as a double.   
//    
   
double factorial(int n)   
{   
   double fact;      // n! 
   
   fact = 1;         // 0! = 1! = 1 
   for (int i = n; i > 1; i--)   
      fact *= i;   
   
   return fact;   
}