Explicit call method is the most suitable method as it creates a temporary object, the chance of data loss will not arise. A temporary object lives in memory as long as it is being used in an expression. After this it get destroyed.

There are two ways to create an object using parameterized constructor.
1. Implicit call
2. Explicit call

Instantiating object is done using constructor.

Whenever an object of a class is declared as a member of another class it is known as a container class.

Classes can be nested in two ways
(i) By defining a class within another class.
(ii) By declaring an object of a class as a member to another Class

s1 object = 12 bytes
s2 object = 12 bytes.

The members will be allocated with memory space only after the creation of the class type object.

A class specification just defines the properties of a class. To make use of a class specified, the variable of that class type have to be declared. The class variables are called object. Objects are also called as instance of class.

If a class definition is specified outside the body of all functions in a program then it is called global class.

Class comprises of members. Members are classified as Data Members and Member functions. Data members are the data variables that represent the features or properties of a class. Member functions are the functions that perform specific tasks in a class. Member functions are called as methods, and data members are also called as attributes.

The purpose of the destructor is to free the resources that the object may have acquired during its lifetime. A destructor function removes the memory of an object which was allocated by the constructor at the time of creating a object.

Declaring a constructor with arguments hides the compiler generated constructor. After this we cannot invoke the compiler generated constructor.

The only difference between structure and class is the members of structure are by default public where as it is private in class.

Class comprises of members. Members are classified as Data Members and Member functions. Data members are the data variables that represent the features or properties of a class. Member functions are the functions that perform specific tasks in a class.