// File: throw.C
//
// Testing try, throw and catch


#include <iostream.h>
#include <iomanip.h>
#include <stdlib.h>


// Need a separate class for each type of error
//
class Error {
public:
   Error(int n=0) : code(n) {}
   int code ;
} ;



void foo(int n) {
  Error e(5) ;

  cout << "Entering foo(" << n << ")" << endl ;

  if (n == 0) return ;

  if (n < 0) throw(e) ;  // throw an exception

  foo(n-2) ;
  cout << "Returning from foo(" << n << ")" << endl ;
}


main() {
   int n ;

   cout << "n = " ;
   cin >> n ;

   // code in try block can throw an execption
   //
   try {
      foo(n) ;
   }

   // If execution of try block results in an exception, the
   // catch block with the correct type is executed.
   //
   catch (Error &e) {
      cerr << "Error code: " << e.code << endl ;
      exit(1) ;
   }

   cout << "Does this statement ever print?" << endl ;
}