Replace Temp with Query

double GetPrice()
{
    int basePrice = _quantity * _itemPrice;
    double discountFactor;
    if (basePrice > )
    {
        discountFactor = 0.95;
    }
    else
    {
        discountFactor = 0.98;
    }
    return basePrice * discountFactor;
}

double GetPrice()
{
    return BasePrice() * DiscountFactor();
}

int BasePrice()
{
    return _quantity * _itemPrice;
}

double DiscountFactor()
{
    if (BasePrice() > )
    {
        return 0.95;
    }
    else
    {
        return 0.98;
    }
}

参考：http://sourcemaking.com/refactoring/replace-temp-with-query