Class C++

[ukeleke]

Write your question here.
For example, I have a base constructor and I want to write a derived constructor using base constructor. Is it valid?

Bill::Bill(string code, string name, float price)//base constructor
{
        _code=code
	_name = name;
	_price = price;
}
VatBill::VatBill(string code,string name,float price,float tax)//derived class constructor
{
        Bill(code,name,price)
        _tax=tax

}

[gunnerfunner]

Is it valid?

Yes, it is and you can simplify your code somewhat by using member initialization lists:

class Bill
{
    private:
        string _code;
        string _name;
        float _price;
    public:
        Bill(string code, string name, float price)
        : _code(code), _name(name), _price(price) {};
};
class VatBill : public Bill
{
    private:
        float _tax;
    public:
        VatBill(string code,string name,float price,float tax)
        : Bill(code, name, price), _tax(tax){};
};

see also using declaration for inheriting ctor's: http://en.cppreference.com/w/cpp/language/using_declaration