// Zig Herzog
// Oct. 2012
//
#include <iostream>
using namespace std;
// This program can be used to illustrate one of the nastier, unintended
// properties of the cin object. The program below works fine as long as 
// the user enters indeed an integer number greater than zero and 
// terminates when the user enters an integer number less/equal to zero.
// If though, the user enters something which includes a non-digit (like
// a decimal point or letter), the program will loop forever executing 
// the two cout statements but ignoring all further user input.
//
// ***********************************************************************
// If this happens, the only way to stop the program is by typing CTRL-C.
// ***********************************************************************
//
// Remedy :  Is the fail method of the cin object which I included
//           below but commented out. cin.fail() will return "true"
//           whenever the user's input conflicts with the data type
//           of the variable to receive the value. As a programmer you 
//           control the action the program will take (here exit after
//           issuing a message.
//
// Note : for data type float or double and integer number is 
//        acceptable but other things like two periods or letter
//        other then "e" or "E" etc. are not and produce the same
//        behavior.


int main ()
{
   int i=1 ;

   while ( i > 0 )
   {
   cout << "Give any positive integer value ( or 0 to terminate) : " ;
   cin >> i ;
// if ( cin.fail() )
// {
//      cout << "\n\nYou messed up. Bye ....\n\n";
//      return 1 ;
// }
   cout << "i=" << i << endl ;
   }
}