Classes

Interface

The first member function is a constructor: the function that is used to initialize new objects.
This constructor has no parameters so it is called a default constructor.
Default constructors are automatically used when you construct an object without parameters.
```
Product best; /* default construction */
```
Every class should have a default constructor.
The read() member function is a mutator function - an operation that modifies the object.
The last two member functions are accessor functions - functions that query the object for some information without changing it.
The keyword const indicates that the implicit parameter object is not modified by the member function.