C++ Program Structure

Let us look at a simple code that would print the words Hello World

#include<iostream>
usingname space std;
// main() is where program execution begins.
int
main()
{
       cout <<"Hello World";
       // prints Hello World
       return 0;
}

Explanation:- 

• The  C++  language  defines  several  headers,  which  contain  information that is either necessary or useful to your program. For this program, the header<iostream>is needed
  

• The   lineusing   namespace   std;tells   the   compiler   touse   the   std namespace. Namespaces are a relatively recent addition to C++

• The  next  line ‘//  main()  is  where  program  execution  begins.’is  a single-line comment available in C++. Single-line comments begin with // and stop at the end of the line.

• The line int main()is the main function where program execution begins.

• The  next  linecout  <<  "This  is  my  first  C++  program.";causes  the message "This is my first C++ program" to be displayed on the screen.

• The next linereturn 0;terminates main()function and causes it to return the value 0 to the calling process