void Calc_ctor(Calc * const me) {
    /* superclass' ctor */
    QHsm_ctor(&me->super, Q_STATE_CAST(&Calc_initial));

    me->operand1 = 0.0;
    me->operand2 = 0.0;
    me->len      = 0U;
    me->opKey    = 0U;
}