There are three types of linkage in c++. They are an internal linkage, external linkage, and no linkage.
In the external linkage, it is used to refer to identifiers in various programs.
external is the default type of linkage that is available for identifiers.
By defining a function’s prototype in another file means, we can inherit all the features from the source function.
The iostream.h is used in the older versions of c++ and iostream is evolved from it in the std namespace.
In the header file, we define something that to be manipulated in the program.
Once the object is declared means, the constructor are also declared by default.
Mutable members are those which can be updated even if it a member of a constant object. You can change their value even from a constant member function of that class.
Macros cannot access the private member of a class therefore #define MAC(S::m) will give an error.
As value_of_a() is a static function and static member can access only static members therefore the program will give error.
By using typedef, we can create a type of pre-existing type only not our own type of data.
There are three types of user-defined data types. They are typedef, union, enumerator.
How many types of models are available to create the user-defined data type? There are two types of models. They are references to built-in types and multipart types.
Objects in the method can be accessed using direct member access operator which is (.).