  // Boolean value : true = 1 & false = 0
      if (true)          
        max(a,b)
      else
        std::cout << "Macro failed." << std::endl;
    return 0;
  } 
*/

// This will always give the output as "Macro failed." because the compiler will look at the code as shown below :
/*
  #include <iostream>
  using namespace std;
  
