1-Syntax structure of Cpp.cpp

#include <iostream>
using namespace std;

int main() {
  cout << "Hello World!";
  return 0;
}

// Line 1: #include <iostream> is a header file library that lets us work with input and output objects, such as 
// cout (used in line 5). Header files add functionality to C++ programs.

// Line 2: using namespace std means that we can use names for objects and variables from the standard library.

// Line 3: A blank line. C++ ignores white space. But we use it to make the code more readable.

// Line 4: Another thing that always appear in a C++ program is int main(). This is called a function. Any code 
// inside its curly brackets {} will be executed.

// Line 5: cout (pronounced "see-out") is an object used together with the insertion operator (<<) to output/print 
// text. In our example, it will output "Hello World!".

// Note: Every C++ statement ends with a semicolon ;.

// Note: The body of int main() could also been written as:
// int main () { cout << "Hello World! "; return 0; }

// Remember: The compiler ignores white spaces. However, multiple lines makes the code more readable.

// Line 6: return 0 ends the main function.

// Line 7: Do not forget to add the closing curly bracket } to actually end the main function.