#include <string>
#include <iostream>

// Note that ALL names must be explicitly declared before
// the are used. Not all must go at the top.
using std::string; using std::cout; using std::endl;

int main()
{
  bool happy = true;  // a logical can be either true or false

  // must include string header file
  string smile("Hello World Again!");
  int my_age(40);
  
  // check numeric_limits or limits header file for float's range
  float const PI = 3.14f;         
  double eight_byte_variable = 0.5;
  cout << "My age: " << my_age << " Happy?: " << happy << endl;
  cout << smile << ' ' << PI << '\t' << eight_byte_variable << endl;
}