text: #include "helloWorld.hpp"
  #include <string>
  
  HelloWorld::HelloWorld()
  {
      this->message = "Hello World";
      this->unit = 0.0;
      this->cost = 0.0;
  }
  
  
  HelloWorld::HelloWorld(int daUnit)
  {
      this->unit = daUnit;
      this->cost = 0.0;
      this->message = "Hello World";
  }
  
  HelloWorld::HelloWorld(int daUnit, float doCost)
  {
      this->unit = daUnit;
      this->cost = doCost;
      this->message = "Hello World";
  }
  
  HelloWorld::HelloWorld(int daUnit, float doCost, const std::string &daMessage)
  {
      this->unit = daUnit;
      this->cost = doCost;
      this->message = daMessage;
  }
  
  std::string HelloWorld::marshal()
  {
      return (message + " = " + std::to_string(unit) + " I cost " + std::to_string(cost) + ".\n" );
  }
  
  std::string& HelloWorld::getMessage()
  {
      return this->message;
  }
  
  int HelloWorld::getUnits(){
      return unit;
  }