In this topic we will learn best concept of Constructor and Destructor in C++ with example.
Constructor
- It is a special member function which is used to initialize data members of a class.
- Constructor is different from all other member functions because it’s name matches with class name and automatically called by compiler when object is created.
- It is similar to other member functions i.e it can be defined inside or outside of the class and can also be passed parameters.
Characteristics of Constructor
- Constructor has the same name as its class name.
- Constructor should be declared in public section.
- Constructor does not return any type not even void.
- Constructor is used to initialize the data member of a class.
- Constructor is automatically called when object is created.
- Constructor can be overloaded i.e multiple constructors can be used in a class.
- It allows passing parameters.
- It follows all the access rules which followed by other member functions.
- It can’t be virtual.
- if a constructor is not defined in the class then default constructor is automatically generated by the compiler.
Types of Constructor
There are three types of constructors in c++.
- Default constructor
- Parameterized constructor
- Copy constructor
Default constructor
A constructor without parameter or Argument is known as default constructor.
class num
{
public:
num()
{
// default constructor
}
};
