C++primer 15.2.3 sessions

Exercise 15.8

Static type: The type at which the object is declared, which is determined at compile time

Dynamic type: The type of object currently being referred to is determined at run time

Exercise 15.9

In the first case, a static type may be different from a dynamic type when there is an implicit conversion between the static type of the object and the dynamic type of the object

The second type: When a base class pointer or base class reference refers to a derived class object

Exercise 15.10

Ifsteam defines a file input stream object that writes input stream objects to the Sales_data class object.

C++primer 15.2.3 sessions