C++ try catch block in a while statement

#include <iostream>
using namespace std;
int main()//from w w  w  .  j a v a  2 s .  c  o  m
{
   int numerator, denominator;
   bool needDenominator = true;
   cout << "Enter a numerator (whole number only): ";
   cin  >> numerator;
   cout << "Enter a denominator (whole number only): ";
   while (needDenominator)
   {
      cin >> denominator;
      try
      {
         if (denominator == 0)
            throw denominator;  // an integer value is thrown
         }
         catch(int e)
         {
            cout << "A denominator value of " << e << " is invalid." << endl;
            cout << "Please reenter the denominator (whole number only): ";
            continue;  // sends control back to the while statement
         }
         cout << numerator << '/' << denominator << " = " << double(numerator)/double(denominator) << endl;
         needDenominator = false;
      }
      return 0;
}