Can abstract classes have constructors C++?

When classes are inherited, the constructors are called in the same order as the classes are inherited . If we have a base class and one derived class that inherits this base class, then the base class constructor (whether default or parameterized) will be called first followed by the derived class constructor.

In general, a pure abstract class is used to define an interface and is intended to be inherited by concrete classes . It’s a way of forcing a contract between the class designer and the users of that class. The users of this class must declare a matching member function for the class to compile.

yes it is . And a constructor of abstract class is called when an instance of a inherited class is created.

Can it have constructor? Yes it can and the purpose is to initialize local variables from the base class. You should avoid using public constructor in Abstract and use protected only.