Function Overloading in C++
15 questions · 12 min · Medium
Objects and Classes in C++ Quiz
Test your knowledge of C++ objects and classes, including class definitions, object creation, access specifiers, constructors, destructors, member functions, encapsulation, static members, and the fundamentals of object-oriented programming.
- 15
- Questions
- 12 min
- Time limit
- Medium
- Difficulty
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All 15 questions and answers Spoilers: this shows the questions and answers. Try the quiz first! Open
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1. What is a class in C++?
- A. A function that executes automatically
- B. A user-defined type that groups data members and member functions
- C. A loop used to repeat instructions
- D. A built-in data type for storing numbers
Show answer
B. A user-defined type that groups data members and member functions
A class is a user-defined type that combines data and functions into a single unit.
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2. Which keyword is used to declare a class in C++?
- A. object
- B. structclass
- C. class
- D. define
Show answer
C. class
The class keyword introduces a class definition in C++.
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3. Which statement correctly creates an object of a class named Car?
- A. class Car;
- B. Car object;
- C. object Car();
- D. new class Car;
Show answer
B. Car object;
The declaration Car object; creates an object named object of the class type Car.
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4. What is the default access specifier for members of a C++ class?
- A. public
- B. protected
- C. private
- D. internal
Show answer
C. private
Members of a class are private by default, so they cannot normally be accessed directly from outside the class.
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5. Which access specifier allows class members to be accessed from outside the class, subject to normal access rules?
- A. private
- B. public
- C. protected
- D. hidden
Show answer
B. public
Public members can be accessed from outside the class through an object or other valid access path.
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6. What is a constructor in C++?
- A. A special member function used to initialize objects
- B. A function that always returns an integer
- C. A keyword used to destroy objects
- D. A variable shared by all functions
Show answer
A. A special member function used to initialize objects
A constructor is called when an object is initialized and can establish its initial state.
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7. Which statement about a C++ constructor is correct?
- A. It must have the return type void
- B. Its name must match the class name
- C. It must always be declared private
- D. It can only be called after the object is destroyed
Show answer
B. Its name must match the class name
A constructor has the same name as its class and does not declare a return type.
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8. What is the purpose of a destructor in C++?
- A. To create additional classes
- B. To overload every operator
- C. To perform cleanup when an object's lifetime ends
- D. To initialize static variables only
Show answer
C. To perform cleanup when an object's lifetime ends
A destructor can release resources owned by an object when its lifetime ends.
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9. Which syntax represents the destructor of a class named Student?
- A. Student()
- B. delete Student()
- C. ~Student()
- D. destructor Student()
Show answer
C. ~Student()
A destructor uses the class name preceded by a tilde, such as ~Student().
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10. How can a member function be called using an object named obj?
- A. obj->function()
- B. obj.function()
- C. obj::function()
- D. function.obj()
Show answer
B. obj.function()
The dot operator accesses a member through an object. The arrow operator is typically used with a pointer to an object.
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11. What does encapsulation mean in object-oriented programming?
- A. Combining data and related functions while controlling access to them
- B. Executing a loop repeatedly
- C. Converting all variables into constants
- D. Creating objects without defining a class
Show answer
A. Combining data and related functions while controlling access to them
Encapsulation groups related data and behavior and uses access controls to protect an object's internal state.
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12. What is a static data member of a C++ class?
- A. A separate variable created for every object
- B. A variable that cannot be initialized
- C. A member associated with the class rather than a separate copy for each object
- D. A local variable inside every member function
Show answer
C. A member associated with the class rather than a separate copy for each object
A static data member belongs to the class and is shared by its objects rather than having a separate instance for each object.
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13. Which operator is commonly used to access a static member through the class name?
- A. .
- B. ->
- C. ::
- D. &
Show answer
C. ::
The scope resolution operator :: can access a static member through the class name, as in Counter::count.
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14. What happens when an object is passed to a function by value in C++?
- A. The original object is always destroyed
- B. A separate parameter object is initialized from the argument
- C. The function receives only the object's class name
- D. The object automatically becomes static
Show answer
B. A separate parameter object is initialized from the argument
Passing an object by value initializes a separate parameter object, usually through a copy or move operation. The original object is not automatically destroyed.
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15. Which statement about objects of the same C++ class is correct?
- A. They must always have identical data member values
- B. They cannot call the same member function
- C. They share all non-static data members automatically
- D. Each object normally has its own non-static data members
Show answer
D. Each object normally has its own non-static data members
Each object has its own instance state through non-static data members, while static data members are shared at the class level.