1. The document describes creating an Int class that imitates the functionality of the int data type. The Int class contains an int variable and member functions to initialize, display, and add Int values. A sample program exercises the Int class. 2. It also describes creating a Tollbooth class to model a tollbooth. The class contains data for the number of cars and amount of money collected. Member functions increment counts for paying and non-paying cars. The class displays the totals. 3. Finally, it describes creating a Time class to store hours, minutes, seconds. Member functions initialize, display, and add Time objects. A program tests the Time class.

1. CH#6.
1. Create a class that imitates part of the functionality of the basic data type int. Call the class Int (note different capitalization).
The only data in this class is an int variable. Include member functions to initialize an Int to 0, to initialize it to an int value, to
display it (it looks just like an int), and to add two Int values. Write a program that exercises this class by creating one
uninitialized and two initialized Int values, adding the two initialized values and placing the response in the uninitialized value,
and then displaying this result.
2.
3. Imagine a tollbooth at a bridge. Cars passing by the booth are expected to pay a 50 cent toll. Mostly they do, but sometimes a
car goes by without paying. The tollbooth keeps track of the number of cars that have gone by, and of the total amount of
money collected. Objects and Classes 6 O C BJECTS AND LASSES 259 07 3087 CH06 11/29/01 2:16 PM Page 259 Model this
tollbooth with a class called tollbooth. The two data items are a type unsigned int to hold the total number of cars, and a type
double to hold the total amount of money collected. A constructor initializes both of these to 0. A member function called
paying Car () increments the car total and adds 0.50 to the cash total. Another function, called nopayCar(), increments the car
total but adds nothing to the cash total. Finally, a member function called display() displays the two totals. Make appropriate
member functions const. Include a program to test this class. This program should allow the user to push one key to count a
paying car, and another to count a nonpaying car. Pushing the Esc key should cause the program to print out the total cars and
total cash and then exit.
4. Create a class called time that has separate int member data for hours, minutes, and seconds. One constructor should initialize
this data to 0, and another should initialize it to fixed values. Another member function should display it, in 11:59:59 format.
The final member function should add two objects of type time passed as arguments. A main() program should create two
initialized time objects (should they be const?) and one that isn’t initialized. Then it should add the two initialized values
together, leaving the result in the third time variable. Finally it should display the value of this third variable. Make appropriate
member functions const.
Ch#9
5. Imagine a publishing company that markets both book and audiocassette versions of its works. Create a class publication that
stores the title (a string) and price (type float) of a publication. From this class derive two classes: book, which adds a page
count (type int), and tape, which adds a playing time in minutes (type float). Eachof these three classes shouldhave agetdata()
function to get its data from the user at the keyboard, and a putdata() function to display its data. Write a main() program to
test the book and tape classes by creating instances of them, asking the user to fill in data with getdata(), and then displaying
the data with putdata().
6. Recall the STRCONV example from Chapter 8. The String class in this example has a flaw: It does not protect itself if its objects
are initialized to have too many characters. (The SZ constant has the value 80.) For example, the definition String s = “This
string will surely exceed the width of the “ “screen, which is what the SZ constant represents.”; will cause the str array in s to
overflow, with unpredictable consequences, such as crashing the system. With String as a base class, derive a class Pstring (for
“protected string”) that prevents buffer overflow when too long a string constant is used in a definition. A new constructor in
the derived class should copy only SZ–1 characters into str if the string constant is longer, but copy the entire constant if it’s
shorter. Write a main() program to test different lengths of strings.
7. Imagine a publishing company that markets both book and audiocassette versions of its works. Create a class publication that
stores the title (a string) and price (type float) of a publication. From this class derive two classes: book, which adds a page
count (type int), and tape, which adds a playing time in minutes (type float). Eachof these three classes shouldhave agetdata()
function to get its data from the user at the keyboard, and a putdata() function to display its data. Write a main() program to
test the book and tape classes by creating instances of them, asking the user to fill in data with getdata(), and then displaying
the data with putdata(). *2. Recall the STRCONV example from Chapter 8. The String class in this example has a flaw: It does
not protect itself if its objects are initialized to have too many characters. (The SZ constant has the value 80.) For example, the
definition String s = “This string will surely exceed the width of the “ “screen, which is what the SZ constant represents.”; will
cause the str array in s to overflow, with unpredictable consequences, such as crashing the system. With String as a base class,
derive a class Pstring (for “protected string”) that prevents buffer overflow when too long a string constant is used in a
definition. A new constructor in the derived class should copy only SZ–1 characters into str if the string constant is longer, but
copy the entire constant if it’s shorter. Write a main() program to test different lengths of strings.