What is copy constructor with example?

When Copy Constructor is called Copy Constructor is called in the following scenarios: When we initialize the object with another existing object of the same class type . For example, Student s1 = s2, where Student is the class. When the object of the same class type is passed by value as an argument.

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Why is copy constructor used?

A constructor in C++ is used to initialize an object . A copy constructor is a member function of a class that initializes an object with an existing object of the same class. In other words, it creates an exact copy of an already existing object and stores it into a new object.

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Is 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.

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Do 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.

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