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Encapsulation & Access Control
Question 1
Predict the output of following program.
#include <iostream>
using namespace std;
class A
{
protected:
int x;
public:
A() {x = 0;}
friend void show();
};
class B: public A
{
public:
B() : y (0) {}
private:
int y;
};
void show()
{
A a;
B b;
cout << "The default value of A::x = " << a.x << " ";
cout << "The default value of B::y = " << b.y<<endl;
}
Compiler Error in show() because x is protected in class A
Compiler Error in show() because y is private in class b
The default value of A::x = 0 The default value of B::y = 0
Compiler Dependent
Question 2
If class A is a friend of class B and class B is a friend of class C, which of the following is true?
Class A is a friend of class C
Class B cannot be a friend of any other class
Class C is a friend of class A
None of the above
Question 3
Is the below statement correct?
In C++, structures provide data encapsulation or data hiding features.True
False
Question 4
Which of the following access modifiers can be used to restrict access to a method or variable to only within the same class?
public
protected
private
default
Question 5
Which of the following best describes the purpose of using access modifiers in class diagrams?
They are used to define the type of diagram being created.
They control the visibility of attributes and methods in a class.
They describe the inheritance hierarchy between classes.
They represent the relationships between different objects in the system.
Question 6
When declaring data members inside a class without specifying access modifiers, what is the default access level typically assigned?
Public — accessible by all
Private — accessible only within the class
Protected — accessible in the class and subclasses
Package-level — accessible within the package or module
Question 7
What is encapsulation in C++?
Wrapping data and functions into a single unit
Hiding the class from the user
Binding UI elements to data
Using inheritance to reuse code
Question 8
What is the main benefit of encapsulation in C++?
Faster execution
Better UI design
Data security and abstraction
Simplified syntax
Question 9
Which OOPS principle restricts direct access to sensitive data using access modifiers?
Inheritance
Abstraction
Polymorphism
Encapsulation
There are 9 questions to complete.