00-hello-world.cxx

My first program in C++.Compile it with

$ g++ -o 00-hello-world 00-hello-world.cxx

This calls the compiler g++, tells it to compile 00-hello-world.cxx and to create an executable named 00-hello-world

Run with

$ ./00-hello-world

// In order to use the input/output library, we need to 
// include a header which describes its interface.
#include <iostream>


// Every C++ program starts with a function called main()
// Invoking the executable 
int main()
{
  // std::cout is the output stream of the program.
  // The << operator writes data to it.
  // std::endl outputs an end-of-line symbol.
  std::cout << "Hello World" << std::endl;
}