Do I need default constructor in C++?

A constructor is always called when constructing a new object, and a constructor of every superclass of the class is also called. If no constructor is explicitly called, the default constructor is called (which may or may not be declared).

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Default Constructors in C++ Constructors are functions of a class that are executed when new objects of the class are created. The constructors have the same name as the class and no return type, not even void. They are primarily useful for providing initial values for variables of the class .

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