Asked by: Sahel Zschuntzsch
asked in category: General Last Updated: 5th May, 2020

Does C++ have default constructor?

Default constructors (C++ only)
A default constructor is a constructor that either has no parameters, or if it has parameters, all the parameters have default values. If no user-defined constructor exists for a class A and one is needed, the compiler implicitly declares a default parameterless constructor A::A() .

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Consequently, does C++ provide default constructor?

In C++, compiler creates a default constructor if we don't define our own constructor (See this). Compiler created default constructor has empty body, i.e., it doesn't assign default values to data members (In java, default constructors assign default values).

Secondly, what is default constructor with example? Default Constructor Example Lets say you try to create an object like this in above program: NoteBook obj = new NoteBook(12); then you will get a compilation error because NoteBook(12) would invoke parameterized constructor with single int argument, since we didn't have a constructor with int argument in above example.

Keeping this in view, is the default constructor always called in C++?

Each class may also define what happens if a variable of the type is defined but an initializer is not provided. This constructor is called the default constructor because it is run "by default;" if there is no initializer, then this constructor is used.

When you write your own constructor the default constructor is no longer available?

5 Answers. First of all, default constructor is not generated, its provided by compiler if no-argument constructor is not written explicitly. When you do not explicitly write a no-argument constructor for a class, the compiler won't complain as long as objects are built without parameter constructors.

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