int main() {   int i;   cout <<"Enter an integer: ";   cin >>i;   try {     if (i != 42) //detect error condition       throw i;   //throw an exception     cout <<"no throw was executed" <<endl;   }   catch(int x) { //catch integer exceptions     cout <<"exception handler called; arg = " <<x <<endl;     i = 42;      //set it to correct value   }   cout <<"normal program exit; i = " <<i <<endl;   return(0); }