C++ try catch block to detect a division-by-zero error.

#include <iostream>
using namespace std;
int main()/*  w w  w  .j av a  2 s .  c  o m*/
{
   int numerator, denominator;
   try
   {
      cout << "Enter the numerator (whole number only): ";
      cin  >> numerator;
      cout << "Enter the denominator (whole number only): ";
      cin  >> denominator;
      if (denominator == 0)
         throw denominator;  // an integer value is thrown
      else
         cout << numerator << '/' << denominator << " = " << double(numerator)/double(denominator) << endl;
   }
   catch(int e)
   {
         cout << "A denominator value of " << e << " is invalid." << endl;
         exit (1);
   }
   return 0;
}