• #include<iostream>

The statement starts with # symbol is called pre-processor directives. This statement tells the pre-processor to include the contents of iostream header file in the program before compilation. This file is required for input-output statements.

• using namespace std;

This statement is used to instruct the compiler to use standard namespace. A namespace is a declarative location that provides a scope to the identifiers. Namespace std contains all the classes, objects and functions of the standard C++ library.

• int main()

This statement is a function and used for the execution of C++ program. int means it returns integer type value.

• {

This symbol represents the start of main function.

• statements;

Statements are instructions that performs particular task. Statement terminator (;) is used to end every statement in C++ program.

• return 0;

This statement is used to return the value to the operating system. By default, main function returns integer value 0.

• }

This symbol represents the end of main function.