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How to write a copy constructor

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What is constructor? A constructor is a member function of a class which initializes objects of a class. It is special member function of the class. How constructors are different from a normal member function?
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Simple Example Program For Copy Constructor In C++

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When does compiler create default and copy constructors in C++? - GeeksforGeeks

The copy constructor is called whenever an object is initialized by direct-initialization or copy-initialization from another object of the same type unless overload resolution selects a better match or the call is elided , which includes. If no user-defined copy constructors are provided for a class type struct , class , or union , the compiler will always declare a copy constructor as a non- explicit inline public member of its class. Note that due to these rules, the implicitly-declared copy constructor cannot bind to a volatile lvalue argument. A class can have multiple copy constructors, e.
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C++ Copy Constructor

A Copy constructor is an overloaded constructor used to declare and initialize an object from another object. The default constructor creates the exact copy or shallow copy of the existing object. Thus, the pointer p of both the objects point to the same memory location. Therefore, when the memory of a field is freed, the memory of another field is also automatically freed as both the fields point to the same memory location. This problem is solved by the user-defined constructor that creates the Deep copy.
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Hi, I'm able to write a copy constructor for a class which contains pointer as a data member. However, when I have a reference as a data member, the copy constructor does not help, i. Please refer to the code below. Storing marks in your class as an int rather than a reference to an int would be the simplest way of solving the problem. Once assigned, a reference cannot be re-assigned and that is the cause of your problem here.
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