Write any four characteristics of constructor.

Write any four characteristics of constructor.
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Answer :

Rules to define constructor: 1. Constructors should be declared in the public section. 2. They are invoked automatically when the objects are created. 3. They do not have return type, not even void and therefore they cannot return values. 4. They can accept arguments. 5. They cannot be inherited, though derived class can call the base class constructor. 6. They cannot be virtual. 7. One cannot refer to their addresses. 8. An object with a constructor cannot be used as a member of a union. 9. They make implicit calls to the operators new and delete when memory allocation is required.
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Answer :

The constructor functions have some special characteristics.  They should be declared in the public section.  They are invoked automatically when the objects are created.  They do not have return types, not even void and therefore, and they cannot return values.  They cannot be inherited, though a derived class can call the base class constructor.  Like other C++ functions, they can have default arguments.  Constructors cannot be virtual.  We cannot refer to their addresses.  An object with a constructor (or destructor) cannot be used as a member of a union.  They make 'implicit calls' to the operators new and delete when memory allocation is required.
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