@Override
    public int height() {
        switch (operand) {
            case '/':
                return c1.height() + c2.height() + 1;
            case '^':
                return c1.height() + c2.height()+1;
            default:
                if (this.c1.height() > this.c2.height()) {
                    return this.c1.height();
                } else {
                    return this.c2.height();
                }
        }
    }