UGC NET CSE | December 2007 | Part 2 | Question: 15

Question

Which of the following is true of constructor function in C++ ?

• A. A class must have at least one constructor.

• B. A constructor is a unique function which cannot be overloaded.

• C. A constructor function must be invoked with the object name.

• D. A constructor function is automatically invoked when an object is created.

Answer 1

Answer: (D)

Whenever we instantiate a class, i.e., create an object of a class, a default constructor, which has same name as that of a class, is automatically invoked. 

So, even if we don't have a constructor in our class, a default constructor is invoked automatically during instantiation. Hence, (A) is incorrect.

Constructors may be overloaded, same as functions. Hence, (B) is incorrect.

Constructors are invoked with the same name as that of the class. Hence, (C) is incorrect.