C++ Primer Plus

8. Devise a structure declaration that describes a fish. The structure should include the kind, the weight in whole ounces, and the length in fractional inches.

9. Declare a variable of the type defined in Question 8 and initialize it.

10. Use enum to define a type called Response with the possible values Yes, No, and Maybe. Yes should be 1, No should be 0, and Maybe should be 2.

11. Suppose ted is a double variable. Declare a pointer that points to ted and use the pointer to display ted’s value.

12. Suppose treacle is an array of 10 floats. Declare a pointer that points to the first element of treacle and use the pointer to display the first and last elements of the array.

13. Write a code fragment that asks the user to enter a positive integer and then creates a dynamic array of that many ints. Do this by using new, then again using a vector object.

14. Is the following valid code? If so, what does it print?

cout << (int *) "Home of the jolly bytes";

15. Write a code fragment that dynamically allocates a structure of the type described in Question 8 and then reads a value for the kind member of the structure.

16. Listing 4.6 illustrates a problem created by following numeric input with line-oriented string input. How would replacing this:

cin.getline(address,80);

with this:

cin >> address;

affect the working of this program?

17. Declare a vector object of 10 string objects and an array object of 10 string objects. Show the necessary header files and don’t use using. Do use a const for the number of strings.

Programming Exercises

1. Write a C++ program that requests and displays information as shown in the following example of output:

What is your first name? Betty Sue

What is your last name? Yewe

What letter grade do you deserve? B

What is your age? 22

Name: Yewe, Betty Sue

Grade: C

Age: 22

Note that the program should be able to accept first names that comprise more than one word. Also note that the program adjusts the grade downward—that is, up one letter. Assume that the user requests an A, a B, or a C so that you don’t have to worry about the gap between a D and an F.

2. Rewrite Listing 4.4, using the C++ string class instead of char arrays.

3. Write a program that asks the user to enter his or her first name and then last name, and that then constructs, stores, and displays a third string, consisting of the user’s last name followed by a comma, a space, and first name. Use char arrays and functions from the cstring header file. A sample run could look like this:

Enter your first name: Flip

Enter your last name: Fleming

Here's the information in a single string: Fleming, Flip

4. Write a program that asks the user to enter his or her first name and then last name, and that then constructs, stores, and displays a third string consisting of the user’s last name followed by a comma, a space, and first name. Use string objects and methods from the string header file. A sample run could look like this:

Enter your first name: Flip

Enter your last name: Fleming

Here's the information in a single string: Fleming, Flip

5. The CandyBar structure contains three members. The first member holds the brand name of a candy bar. The second member holds the weight (which may have a fractional part) of the candy bar, and the third member holds the number of calories (an integer value) in the candy bar. Write a program that declares such a structure and creates a CandyBar variable called snack, initializing its members to "Mocha Munch", 2.3, and 350, respectively. The initialization should be part of the declaration for snack. Finally, the program should display the contents of the snack variable.

6. The CandyBar structure contains three members, as described in Programming Exercise 5. Write a program that creates an array of three CandyBar structures, initializes them to values of your choice, and then displays the contents of each structure.

7. William Wingate runs a pizza-analysis service. For each pizza, he needs to record the following information:

• The name of the pizza company, which can consist of more than one word

• The diameter of the pizza

• The weight of the pizza

Devise a structure that can hold this information and write a program that uses a structure variable of that type. The program should ask the user to enter each of the preceding items of information, and then the program should display that information. Use cin (or its methods) and cout.

8. Do Programming Exercise 7 but use new to allocate a structure instead of declaring a structure variable. Also have the program request the pizza diameter before it requests the pizza company name.

9. Do Programming Exercise 6, but instead of declaring an array of three CandyBar structures, use new to allocate the array dynamically.