#include <iostream>
#include "expression_OOP.cpp"

int main ()
{ 
  ifmp::xepression a (3);
  ifmp::xepression b (4);
  ifmp::xepression c (5);
  ifmp::xepression d = abs(a-b-c); // left-right
  ifmp::xepression e = abs(a-(b-c)); // right-left
  ifmp::xepression f = -e;
  std::cout << d << "\n";
  std::cout << e << "\n";
  std::cout << f << "\n";
  std::cout << d.evaluate() << "\n"; // 6
  std::cout << e.evaluate() << "\n"; // 4
  std::cout << f.evaluate() << "\n"; // -4

  // xepression with unknowns
  double celsius;
  ifmp::xepression Celsius (&celsius);
  ifmp::xepression fahrenheit = 9.0 * Celsius / 5.0 + 32.0;
  std::cout << fahrenheit << "\n";
  for (celsius = -30; celsius <= 40; celsius += 5) 
    std::cout << "C = " << celsius << ", F = " << fahrenheit.evaluate() << "\n"; 

  return 0;
}