// This is an unnamed macro... it's just a list of commands you could execute 
// from the ROOT command line, but that you've collected in a file instead 
// for ease of future use.
// Note that all commands are enclosed within a set of curly brackets.
// Execute this set of commands from the command line by doing ".x unnamed_macro.C"
{

  std::cout << "Hello Duke REU students!" << std::endl;
  
  float x = 31.2;  // Define a floating point variable 'x' and assign its value
  float y;         // Define a floating point variable 'y' with no value assigned
  int   i =  12;   // Define an integer and assign its value.

  // Print these new variables to the screen
  std::cout << "x = " << x << std::endl;
  std::cout << "y = " << y << std::endl;
  std::cout << "i = " << i << std::endl;

  // Do some math and print the result
  y = x + i;
  std::cout << "The sum of x and i is: " << y << std::endl;
  

}