//file tk10.3


Using enum

Create a type, give it a name, tell the compiler what values your new data
type will accept. Now you have an enumerated keyword called enum. An
example: A data type called colors can be created that allows only the
values red, green, blue, and yellow as data.

enum sizes {small, medium, large, jumbo};

//sizes can have one of four values: small, medium, large, or jumbo. Now
//declare two variables of the type.

enum sizes drink_size, popcorn_size;

//The variable drink_size and popcorn_size are of type sizes and can be
//assigned one of the four sizes defined in the sizes type.

The enumerated type value may not be printed or an error will result.
Enumerated types are best used in expressions and switch structures,
rather than directly for output.

The compiler begins assigning integers with zero. Although you may choose
your own values. Example:

enum quantity {Single=1, Dozen=12, Full_Case=48, Gross=144};

enum month {January=1, February, March April, May, June, July, August,
		September, October, November, December};

An example of enum using integers:

if (drink_size > medium) 
   { cout << "This drink will not fit in your cup holder.\n";}

Short Answer:

1. Write a statement that declares an enum type called speed that allows
the values stopped, slow, and fast.

2. Write a statement that declares a variable named rabbit of the type you
declared in question 1.

3. Write a statement that assigns the value fast to the rabbit variable
you declared above.

4. What does the compiler use internally to represent the values of an
enum type?

5. Write a statement that declares an enum type called temperature that
allows the values frigid, cold, cool, mild, warm, hot, and sizzling. Have
the list begin with the value 1.

6. Make a list of several different enumerated data types that could be
useful in programs. For example, 

enum TrueFalse {FALSE, TRUE} or enum Position {open, closed}.

7. Write a program that uses a loop to encrypt a string by adding 1 to the
ASCII value of each character in the string. The string "ABCDEF" would
become "BCDEFG." The string "apple" would become "bqqmf." 

8. Modify the program above to decrypt a string that has been encrypted
using the method of Project 10-2.