/*********************************************************************
  C201 Computer Programming II
  Fall 2006
  Dana Vrajitoru &

  Test file for the class representing large integer numbers.

**********************************************************************/

#include "number.h"

const Number Factorial(const Number &n);

int main()
{
  Number n, m;
  cout << "Enter two large numbers to test the arithmetic operations" 
       << endl;
  cin >> n >> m;
  cout << "Addition:       " << (n + m) << endl
       << "Subtraction:    " << (n - m) << endl
       << "Multiplication: " << (n * m) << endl
       << "Division:       " << (n / m) << endl
       << "Modulus:        " << (n % m) << endl << endl;
  cout << "Enter a number to compute the factorial for" << endl;
  cin >> n;
  cout << "The factorial of f is " << Factorial(n) << endl;
  return 0;
}


// Computing the factorial of a number.
// The factorial of 15 is 1307674368000.
const Number Factorial(const Number &n)
{
  Number f = 1, i;
  // The following tests the -- operator:
  // for (i = n; i >= 2; --i) {
  for (i = 2; i <= n; ++i) { // could use n >= i or i != n
    f *= i;                  // to test the other operators
  }
  return f;
}