Basic Structure of a program

The best way to learn a programming language is by writing programs. Typically, the first program beginners write is a program called "Hello World", which simply prints "Hello World" to your computer screen. Although it is very simple, it contains all the fundamental components C++ programs have==

// my first program in C++
#include <iostream>

using namespace std; 

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

 Output: Hello world!