// Datum.cc
// include all header files needed to declare the class
#include <iostream>
using namespace std;

class Datum {
  public:
    Datum() { }

    Datum(double x, double y) {
      value_ = x;
      error_ = y;
    }

    Datum(const Datum& datum) {
      value_ = datum.value_;
      error_ = datum.error_;
    }


    void print() {
      cout << "datum: " << value_
           << " +/- " << error_
           << endl;
    }

  private:
    double value_;
    double error_;
};