The default constructor must be defined if a parameterized constructor is defined and the object is to be created without arguments.
If the object is created without arguments and only parameterized constructors are used, the compiler will give an error as there is no default constructor defined. And some constructor must be called so as to create an object in memory.
a static constructor can be created using parameter
static constructors are can’t be parameterized
Can constructors be overloaded in the derived class?
The constructor must be having the same name as that of a class. Hence a constructor of one class can’t even be defined in another class. Since the constructors can’t be defined in a derived class, it can’t be overloaded too, in derived class.
What happens if non-static members are used in static member function?
There must be specific memory space allocated for the data members before the static member functions use them. But space is not reserved if the object is not declared. Hence only if static members are not used, it leads to compile time error.
Which member function doesn’t require any return type?
constructor and destructor are also considered as member functions of a class, and they never have any data type.
Which feature of OOP reduces the use of nested classes?
Using inheritance we can have the security of the class being inherited. The subclass can access the members of the parent class. And have more features than a nested class being used.
What is an abstract class?
An abstract class is a class that is declared abstract — it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.
Which type of inheritance leads to diamond problem?
When 2 or more classes inherit the same class using multiple inheritances and then one more class inherits those two base classes, we get a diamond-like structure. Here, ambiguity arises when the same function gets derived into 2 base classes and finally to 3rd level class because the same name functions are being inherited.
Class is pass by?
Classes are passed by reference, It doesn’t depend on the program.
If different properties and functions of a real world entity is grouped or embedded into a single element, what is it called in OOP's?
Encapsulation which groups different properties and functions of a real-world entity into a single element. Abstraction, on other hand, is hiding of functional or exact working of codes and showing only the things which are required by the user.