A constructor with no argument is ........... .

Question

Accepted Answer

The correct option is (1):
A constructor in object-oriented programming (OOP), such as in C++, is a special member function used to initialize the objects of its class. The specific type of constructor that does not accept any arguments is formally known as a Default Constructor. Every class is guaranteed to have one; if the programmer does not explicitly define any constructor, the compiler will automatically provide an implicit default constructor. Its essential role is to ensure an object is created and initialized into a predictable state when no initial values are provided at the time of its creation, making it the most accurate term for a no-argument constructor.

The incorrect option is (2):
The term Parameterized Constructor refers to a constructor that explicitly accepts one or more arguments (parameters). These arguments are passed to the constructor at the time of object creation to initialize the object's member variables with specific, user-provided values. This is used when you want to supply custom initial data for the new object. Since the question specifically asks for a constructor with *no* arguments, the parameterized constructor is not the correct classification.

The incorrect option is (3):
A Copy Constructor is another distinct type of constructor used for initialization. Its definition requires exactly one argument, which must be a reference to an object of the same class. Its sole purpose is to create a new object by copying the values from an already existing object of the same type. Because it requires a mandatory argument (the source object to be copied), it does not fit the definition of a constructor with "no argument."

The incorrect option is (4):
The option "All options are wrong" is incorrect because "Default" is the universally accepted and precise technical term for a constructor that accepts no arguments in C++ and similar object-oriented programming languages. Since Option 1 correctly identifies the type of constructor in question, this option cannot be true.