// Solution to optional HW problem

void IfElse::codeGen()
{
  string falseLab = newLabel();
  string afterLab;  // only used if there is an else

  cond->codeGen();
  emit("if ", cond->getPlace(), "= 0 goto ", falseLab);
  thenPart->codeGen();

  if (optElse != NULL) {
    afterLab = newLabel();
    emit("goto ", afterLab);
  }

  emit(falseLab, ":");

  if (hasElse) {
    optElse->codeGen();
    emit(afterLab, ":");
  }
}