Java: An Introduction to Problem Solving and Programming (8th Edition)
8th Edition
ISBN: 9780134462035
Author: Walter Savitch
Publisher: PEARSON
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Textbook Question
Chapter 5, Problem 3PP
Create a class that represents a grade distribution for a given course. Write methods to perform the following tasks:
- Set the number of each of the letter grades A, B, C, D, and F.
- Read the number of each of the letter grades A, B, C, D, and F.
- Return the total number of grades.
- Return the percentage of each letter grade as a whole number between 0 and 100, inclusive.
- Draw a bar graph of the grade distribution.
The graph will have five bars, one per grade. Each bar can be a horizontal row of asterisks, such that the number of asterisks in a row is proportionate to the percentage of grades in each category. Let one asterisk represent 2 percent, so 50 asterisks correspond to 100 percent. Mark the horizontal axis at 10 percent increments from 0 to 100 percent, and label each line with its letter grade.
For example, if the grades are 1 A, 4 Bs, 6 Cs, 2 Ds, and 1 F, the total number of grades is 14, the percentage of As is 7, the percentage of Bs is 29, the percentage of Cs is 43, the percentage of Ds is 14, and the percentage of Fs is 7. The A row would contain 4 asterisks (7 percent of 50 rounded to the nearest integer), the Brow 14, the C row 21, the D row 7, and the F row 4. The graph would look like this:
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Create a class that represents the grade distribution for a given course. In this class you should write methods to perform the following tasks:
Read the number of each of the letter grades A, B, C D and F
Set the number of letter grades A, B, C, D and F
Return the total number of grades
Return the percentage of each letter grade as a whole number between 0 and 100 inclusive
Draw a bar graph of the grade distributionThe graph should have five bars, one per grade. Each bar can be a horizontal row of asterisks, such that the number of asterisks in a row is proportionate to the percentage of grades in each category. For example, let on asterisk represent 2%, so 50 asterisks correspond to 100%. Mark the horizontal axis at 10% increments from 0 to 100% and label each line with a letter grade.For example, if the grades are entered as 1A, 4B's, 6C's, 2D's and 1 F, then the output would look like:
0 10 20 30 40 50 60 70 80 90 100 IIIIIIIIIII **************************************************…
A class plays a fishing game in which a large tub is filled with plastic fish that are identical, except that some are red and the rest are white. A student is blindfolded and pulls 10 fish out of the tub. The student removes the blindfold, writes down how many of each color fish she got, and then puts the fish back in the tub. Each student takes a turn. The results are shown in the table.
Display these data in a dot plot.
Write and answer (to the extent possible) at least three questions about the data display in part (a); include at least one question at each of the three graph-reading levels discussed in the reading.
The zoo will have several animals, and each animal will have a name, age, and species. Moreover, each animal will have a method make_sound(), which should return a string representing the sound it makes. Perform the following steps:
Create a Zoo class. This class should be able to store multiple animals. It should have methods to add_animal and remove_animal. Also, add a method get_animals that prints a list of all animals currently in the zoo, including their name, age, and species.
Create an Animal parent class. This class should have attributes for name, age, and species. Include a make_sound() method that returns a string representing the sound the animal makes.
Create two or more child classes that inherit from Animal (for example, Lion and Elephant - you get to choose the animal types). These child classes should override the make_sound() method to return a sound specific to the animal they represent.
Your program should be interactive. It should provide a menu to the user that…
Chapter 5 Solutions
Java: An Introduction to Problem Solving and Programming (8th Edition)
Ch. 5.1 - Consider the program in Listing 5.4 . Suppose you...Ch. 5.1 - Prob. 2STQCh. 5.1 - Prob. 3STQCh. 5.1 - Suppose every species in the world has a peculiar...Ch. 5.1 - Revise the definition of the method writeOutput in...Ch. 5.1 - Revise the definition of the method readInput in...Ch. 5.1 - Revise the definition of the method...Ch. 5.1 - What is the meaning of (int) that appears in the...Ch. 5.1 - Prob. 9STQCh. 5.1 - Define a method called getDensity that could be...
Ch. 5.1 - Define a method called changePopulation that could...Ch. 5.1 - Define a method called changePopulation that could...Ch. 5.2 - In Listing 5.12, we set the data for the object...Ch. 5.2 - Give preconditions and postconditions for the...Ch. 5.2 - What is an accessor method? What is a mutator...Ch. 5.2 - Give the complete definition of a class called...Ch. 5.2 - Prob. 17STQCh. 5.2 - In the definition of the method in Listing 5.15,...Ch. 5.2 - What is a well-encapsulated class definition?Ch. 5.2 - When should an instance variable in a class...Ch. 5.2 - Prob. 21STQCh. 5.2 - In a class definition, is anything private ever...Ch. 5.2 - In a class definition, is the body of any method...Ch. 5.3 - What is a reference type? Are class types...Ch. 5.3 - When comparing two quantities of a class type to...Ch. 5.3 - Prob. 26STQCh. 5.3 - Write a method definition for a method called...Ch. 5.3 - Given the class Species as defined in Listing...Ch. 5.3 - After correcting the program in the previous...Ch. 5.3 - What is the biggest difference between a parameter...Ch. 5.3 - Prob. 31STQCh. 5.3 - Write an equals method for the class Person...Ch. 5.4 - Rewrite the method drawFaceSansMouth in Listing...Ch. 5 - Design a class to represent a credit card. Think...Ch. 5 - Repeat Exercise 1 for a credit card account...Ch. 5 - Repeat Exercise 1 for a coin instead of a credit...Ch. 5 - Repeat Exercise 1 for a collection of coins...Ch. 5 - Consider a Java class that you could use to get an...Ch. 5 - Consider a class that keeps track of the sales of...Ch. 5 - Consider a class MotorBoat that represents...Ch. 5 - Prob. 8ECh. 5 - Prob. 9ECh. 5 - Prob. 10ECh. 5 - Write a program to answer questions like the...Ch. 5 - Define a class called Counter. An object of this...Ch. 5 - Prob. 3PCh. 5 - Define a Trivia class that contains information...Ch. 5 - Define a Beer class that contains the following...Ch. 5 - Write a grading program for an instructor whose...Ch. 5 - Add methods to the Person class from Self-Test...Ch. 5 - Create a class that represents a grade...Ch. 5 - Write a program that uses the Purchase class in...Ch. 5 - Write a program to answer questions like the...Ch. 5 - Consider a class that could be used to play a game...Ch. 5 - Consider a class BasketballGame that represents...Ch. 5 - Consider a class ConcertPromoter that records the...Ch. 5 - Prob. 9PPCh. 5 - Consider a class Movie that contains information...Ch. 5 - Repeat Programming Project 18 from Chapter 4, but...Ch. 5 - Prob. 12PP
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