text: 
  
  void exp() {
  	term();
  	while(1) {
  		opsuma();
  		term();
  		if () break;
  	}
  }
  
  void opsuma(){
  }
  
  void factor(){
  	switch(){
  		case: \\catch(();
  		case:
  		default: \\ We wait something else.
  }
  
  int main() {
  
  
  
      return 0;
  }
  
  