CONSTRUCTOR

C++ provides a special member function called the constructor which enables an object to initialize itself when it is created. This is known as automatic initialization of objects.

Similarly, it also provides another member function called the destructor that destroys the objects when they are not required.

CONSTRUCTOR

A constructor is a special member function of a class, which constructs an object.

A constructor must be declared in public specifier of a class. It is mainly used to initialize the data members of a class.

A constructor name is as same name as the class name. The constructors should not have any return type

The constructors are defined with or without arguments

A constructor is an automatically executed member function of a class. A constructor is invoked when the class object is instantiated (created).

A constructor is invoked once for each object.

A constructor is also defined inside/outside of a class.

Syntax              

public:

classname ( [parameter_list] )

{

Statement block;

}

Example:

class sample

{

private:

int n;

public:

sample()

{

n=0;

}

sample(int k) {

n=k;

 }

};