Empty Constructors in C++:
c++, constructor
Solution
Your empty constructor does not do what you want. The `double` data member will not be zero-initialized unless you do it yourself. The `std::string` will be initialized to an empty string. So the correct implementation of the default constructor would simply be
C::C() : B() {} // zero-initializes B
Concerning the other constructor, you should prefer the initialization list:
C::C(const string& a, double b) : A(a), B(b) {}
otherwise, what you are doing is an assignment to default constructed objects.
Problem
In my code I am doing the following, but I am not sure if I am "allowed" to or if it is a good designing technique. I need to create an empty constructor, but I also need a constructor that initializes the variables given the parameters. So I am doing the following: This is the C.h file. ``` class C { private: string A; double B; public: //empty constructor C(); C(string, double); } ``` And my C.cpp file: ``` //this is how I declare the empty constructor C::C() { } C::C(string a, double b) { A = a; B = b; } ``` Is the way I am declaring the empty constructor right or do I need to set A= NULL and B=0.0?