Implementation Files

• An implementation file contains the full method definitions, the implementations of the method prototypes, that are in a corresponding header file.
• Implementation files have the full C++ definitions of class methods and often have names with the extension ".cpp".
• Implementation files do not have class definitions, so the method names must be prefixed by the class name and scope resolution operator "::", for example, "ItemInfo::display".
• Here is the implementation file item.cpp:

  #include "item.H"
  
  ItemInfo::ItemInfo(double p, string c) {
    price = p;
    color = c;
  };
  
  double ItemInfo::getPrice() {
    return price;
  }
  
  string ItemInfo::getColor() {
    return color;
  }
  
  void ItemInfo::display() { // Default behavior for item display
    cout << "The item's price is " << price << endl;
    cout << "The item's color is " << color << endl;
  }