Chapter 9 (281-308)    Summary: p303    Review: p304-305
Review Questions: 1, 9, 10, 11, 12, 14, 15, 16


-) What does the C++ keyword class do?

-) Design a class for ...

-) Demonstrate the proper way to define a class.

-) Variables describe an is-a relationship while classes describe a
   have-a relationship. 


Example - consider the following two code segments:

//segment 1
int a; // a is an integer.

//segment 2 
class Date {
private:
//accessors mutators and other functions go here
public:
  int month;
  int day;
  int year;
};
//Date has-a day month and year.


-) Demonstrate in code how to make a class.

-) What is an accessor function?

-) What is a mutator function?

-) Why are accessor and mutator functions preferred when using classes?

-) Demonstrate how to compile a class and driver.
Example: A class called Help with a driver program called main.cpp is 
  g++ Help.cpp main.cpp -o main.exe

-) Preprocessor commands: #ifndef/#endif #define #include

-) Why is the #ifndef expression used when creating classes?

-) What is the difference between #ifndef and #define

-) What is the scope resolution operator do?

-) Why is the scope resolution operator necessary?

-) Why should data in a class be private?

-) Why should classes be defined in their own file?

-) What are the interface and implementation files for a class called :
Example: a class called Help is separated into Help.h and Help.cpp

-) Why are interface and implementation separated?

-) What is data encapsulation? -Why is it useful?

-) What is information hiding? -Why is it useful?