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Member Functions (const)

• When the keyword const is used in the declaration, it must also be placed in the member function definition.

  void Product::print() const
  {
     cout << name
        << " Price: " << price
        << " Score: " << score << "\n";
  }
  

• The keyword const indicates that the member function will not modify the object that called it.
• When you refer to a data field in a member function, it denotes the data field of the object for which the member function was called.

  best.print();
  

• The object to which a member function is applied is called the implicit parameter.
• A parameter explicitly mentions in the function definition is called an explicit parameter.

  bool Product::is_better_than(Product b) const
  {
     if (b.price == 0) return false;
     if (price == 0) return true;
     return score / price > b.score / b.price;
  }
  
  

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