Question

When you create a C++ class, you are given 4 default methods. What are they and why is it important that you remember that these exist?

Answer 1

class Sample { 
    // default constructor 
    Sample::Sample() {

    } 
 
    // copy constructor 
    Sample::Sample(Sample const& rhs) {
    
    } 
 
    // destructor 
    Sample::~Sample() {
        
    } 
 
    // assignment operator 
    Sample& operator=(Sample const& rhs) { return *this; } 
}; 

Default constructor:
   This is a parameterless constructor and has empty body. If no user defined constructors are declared then by deafult this is used.

Copy Constructor:
   copy an object to pass it as an argument to a method. Constructor which creates a object by initializing it with an object of same class.
  
Destructor:
   It Provides a destructor equivalent to user defined destructor with a empty body. It is Declared only if no user defined destructor is declared. It is defined only if used.
  
Assignment operator:
   Provides the default Assignment operator (=), which copies the class instance. It is Declared when no user defined assignment operator is declared. It is defined only if used.