Objects and Classes Questions

Answer: Option C

Access specifiers are followed by both comma and methods.

There are 3 access specifiers in c++. Public, Private and Protected. 

Public members are accessible outside the class through an object of the class.

Protected members are also accessible outside the class but only from the class which derived it.All public members of a base class becomes protected members of the derived class.

Private members can not be accessed from outside the class.

In Private inheritance, all public and protected members of base class becomes private to the derived class and can be accessible.

Answer: Option C

When we derive a class from another class and try to use some variable in derived class, the compiler first checks for the variable in derived class scope and then goes for the variables derived from base class.

Answer: Option A

Derived class inherits data members and member functions from base class.

There are 3 access specifiers in c++. Public, Private and Protected. 

Public members are accessible outside the class through an object of the class.

Protected members are also accessible outside the class but only from the class which derived it.All public members of a base class becomes protected members of the derived class.

Private members can not be accessed from outside the class.

In Private inheritance, all public and protected members of base class becomes private to the derived class and can be accessible.

Answer: Option C

Private members of a class can only be accessed by the member functions of that class and can not be accessed by the derived class or global functions in the program.

There are 3 access specifiers in c++. Public, Private and Protected. 

Public members are accessible outside the class through an object of the class.

Protected members are also accessible outside the class but only from the class which derived it.All public members of a base class becomes protected members of the derived class.

Private members can not be accessed from outside the class.

In Private inheritance, all public and protected members of base class becomes private to the derived class and can be accessible.

Answer: Option C

Static data members will be shared by all instances of its class.

Static class member functions are independent of how many objects are created for that class. There will be only one copy the static member function will be existed for all instances of the class. We don't have to instantiate a class to access static functions of that class. we use scope resolution operator '::' to access static member functions.

Answer: Option B

A private data member can not be declared as a friend. A class can be declared as a friend.

A friend function is a regular function with its definition placed outside of any class. But a friend function when defined will have access to all private and public members of the class.

To define a friend function, we will declare the function name preceded with keyword inside the class and function definition will be placed outside of the class.

A friend function can be invoked directly by using the function name.

Answer: Option C

Private is default access specifier for data members of a class if not provided one.

There are 3 access specifiers in c++. Public, Private and Protected. 

Public members are accessible outside the class through an object of the class.

Protected members are also accessible outside the class but only from the class which derived it.All public members of a base class becomes protected members of the derived class.

Private members can not be accessed from outside the class.

In Private inheritance, all public and protected members of base class becomes private to the derived class and can be accessible.

Answer: Option C

This technique Dynamic memory allocation. We use 'new' operator in c++ to dynamically allocate memory in runtime. We can dynamically allocate space in runtime but we can not create new dynamic variables. for this reason usually we create dynamic variable and we store its address in a pointer. Below is one example of dynamic memory allocation.

int * x;  //declare a pointer 

x = new int;    // dynamically allocate memory of type int and assign its address to x

Answer: Option B

Instance and Object are almost same in c++.

But in general, in Object oriented programming model, instance and object had one basic difference.

Lets say,

Test t;

here t is an object of the class. the 't' becomes an instance when we instantiate it like new t().

Answer: Option C

Protected is access specifier and is used to control access to class members.

There are 3 access specifiers in c++. Public, Private and Protected. 

Public members are accessible outside the class through an object of the class.

Protected members are also accessible outside the class but only from the class which derived it.All public members of a base class becomes protected members of the derived class.

Private members can not be accessed from outside the class.

In Private inheritance, all public and protected members of base class becomes private to the derived class and can be accessible.