#include <iostream>
#include "Foo.H"

using namespace std;

const int SENTINAL = 0;

int main () {

   int num;
   Foo foo = Foo();

   cout << "Enter a positive number (" << SENTINAL << " to exit): " ;
   cin >> num;
   
   while ( num != SENTINAL ) {
      
      try {
         foo.setNum(num);     // setNum might throw an exception
         cout << "Success - foo.num = " << foo.getNum() << endl;
      } catch (IllegalArgumentException) {
         cerr << "Failure - caught IllegalArgumentException" << endl;
      }

      cout << "Enter a positive number (" << SENTINAL << " to exit): " ;
      cin >> num;
   }
   
   return EXIT_SUCCESS;
}

#include "Foo.H"

using namespace std;

void Foo::setNum(int num) {
   if ( num > 0 ) {                 // if negative throw an exception
      this->num = num;
   } else {
      throw IllegalArgumentException();
   }
}

int Foo::getNum() {
   return this->num;
}

#ifndef _FOO_H_
#define _FOO_H_

class IllegalArgumentException {};   // lame exception class - empty

class Foo {
   public:
      void setNum(int num);
      int getNum();
   private:
      int num;
};

#endif