#include <expression.h>
#include <iostream>
#include <string>

using std::cout;
using std::endl;
using std::string;
using namespace lemon;

int main() {
  Expr<string, double> b;
  cout << b << endl;
  Expr<string, double> c("f");
  cout << c << endl;
  Expr<string, double> d=8.0*string("g");
  cout << d << endl;
  c*=5;
  cout << c << endl;
  Expr<string, double> e=c;
  e+=8.9*9.0*string("l");
  cout << e << endl;
  cout << c+d << endl;
}