Since defining a class makes a new data type

By creating models of the problem domain

In C++ the value of each variable is stored directly in memory without the need for either a reference or an object. This makes access faster, but it is one of the reasons we need to declare each variable because different types take differing amounts of space in memory!

Note that the internally stored values representing true and false are actually 1 and 0 respectively.

The double quotes " are used for headers and files not provided by the implementation.