base a declares a variable a of type base and calls its default constructor (assuming it’s not a builtin type). base a(); declares a function a that takes no parameters and returns type base .
Read moreHow does a default constructor work?
In both Java and C#, a “default constructor” refers to a nullary constructor that is automatically generated by the compiler if no constructors have been defined for the class. The default constructor implicitly calls the superclass’s nullary constructor, then executes an empty body .
Read moreHow can we recognize a default constructor?
Default constructors (C++ only)
Read moreWhere is the default constructor in Java?
Java compiler automatically creates a default constructor (Constructor with no arguments ) in case no constructor is present in the java class.
Read moreIs a default constructor needed?
Java doesn’t require a constructor when we create a class. … The compiler automatically provides a public no-argument constructor for any class without constructors. This is called the default constructor. If we do explicitly declare a constructor of any form, then this automatic insertion by the compiler won’t occur.
Read moreDo I need default constructor in C++?
Answer: C++ Empty constructor necessity depends upon class design requirements . We know that C++ class constructor is called when we create an object of a class. If a class is not required to initialize its data member or does not contain data member, there is no need to write empty constructor explicitly.
Read moreWhat is the use of default constructor?
Q) What is the purpose of a default constructor? The default constructor is used to provide the default values to the object like 0, null, etc., depending on the type .
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