Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
7th Edition
ISBN: 9780134802213
Author: Tony Gaddis
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 7, Problem 13PC
Sorted List of 1994 Gas Prices
Note: This assignment can be done either as an enhancement to the program that you wrote for
In the student sample programs for this book, you will find a text file named 1994_Weekly_Gas_Averages.txt. The file contains the average gas price for each week in the year 1994, (There are 52 lines in the file. Line 1 contains the average price for week 1, line 2 contains the average price for week 2, and so forth.) Write a program that reads the gas prices from the file, and calculates the average gas price for each month. (To get the average price for a given month, calculate the average of the average weekly prices for that month.) Then, the program should create another file that lists the names of the months, along with each month’s average gas price, sorted from lowest to highest.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Chapter 7 - Programming Challenge 15
15. World Series Champions If you have downloaded this book’s source code (the companion Web site is available at www.pearsonhighered.com/gaddis), you will find a file named WorldSeriesWinners.txt. This file contains a chronological list of the winning teams in the World Series from 1903 through 2009. (The first line in the file is the name of the team that won in 1903, and the last line is the name of the team that won in 2009. Note that the World Series was not played in 1904 or 1994, so those years are skipped in the file.) Write a program that lets the user enter the name of a team, and then displays the number of times that team has won the World Series in the time period from 1903 through 2009.
Tip: Read the contents of the WorldSeriesWinners.txt file into an ArrayList. When the user enters the name of a team, the program should step through the ArrayList, counting the number of times the selected team appears
You only need to submit the…
The names and student numbers of students are save in a text file called stnumbers.txt. Example of the content of the text file:
Peterson
20570856
Johnson
12345678
Suku
87654321
Westley
12345678
Venter
87654321
Mokoena
79012400
Makubela
29813360
Botha
30489059
Bradley
30350069
Manana
30530679
Shabalala
28863496
Smith
87873909
Nilsson
30989698
Makwela
30256607
Govender
30048117
Ntumba
30598303
Ramsamy
29952239
Skosana
29982995
Jameson
30228484
Xulu
29092248
Wasserman
27469352
Bester
28615425
Babane
27154033
Maboya
29897890
Mahlangu
30031338
Majavu
30165970
Myene
30954177
Motaung
30907276
Ramaroka
30804507
Radebe
30007674
Sekake
30017416
Zwane
30038227
Shuro
30238072
Viljoen
28881389
Sithole
45688555
Write a function called displayData() to receive the array and number of elements as parameters and display the names and student numbers of the students with a heading and neatly spaced.
Write a function, isValid(), which receives a number as parameter and determines whether the number…
Finish this program from the code posted below! Note: There should be two files Main.py and Contact.py
You will implement the edit_contact function. In the function, do the following:
Ask the user to enter the name of the contact they want to edit.
If the contact exists, in a loop, give them the following choices
Remove one of the phone numbers from that Contact.
Add a phone number to that Contact.
Change that Contact's email address.
Change that Contact's name (if they do this, you will have to remove the key/value pair from the dictionary and re-add it, since the key is the contact’s name. Use the dictionary's pop method for this!)
Stop editing the Contact
Once the user is finished making changes to the Contact, the function should return.
Code:from Contact import Contactimport pickledef load_contacts():""" Unpickle the data on mydata.dat and save it to a dictionaryReturn an empty dictionary if the file doesn't exist """try:with open("mydata.dat", 'rb') as file:return…
Chapter 7 Solutions
Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)
Ch. 7.1 - Write statements that create the following arrays:...Ch. 7.1 - Whats wrong with the following array declarations?...Ch. 7.1 - Prob. 7.3CPCh. 7.1 - Prob. 7.4CPCh. 7.1 - Prob. 7.5CPCh. 7.1 - Prob. 7.6CPCh. 7.1 - Prob. 7.7CPCh. 7.1 - Prob. 7.8CPCh. 7.2 - Prob. 7.9CPCh. 7.2 - Prob. 7.10CP
Ch. 7.2 - A program has the following declaration: double[]...Ch. 7.2 - Look at the following statements: int[] a = { 1,...Ch. 7.3 - Prob. 7.13CPCh. 7.3 - Write a method named zero, which accepts an int...Ch. 7.6 - Prob. 7.15CPCh. 7.7 - Recall that we discussed a Rectangle class in...Ch. 7.10 - Prob. 7.17CPCh. 7.11 - What value in an array does the selection sort...Ch. 7.11 - How many times will the selection sort swap the...Ch. 7.11 - Prob. 7.20CPCh. 7.11 - Prob. 7.21CPCh. 7.11 - If a sequential search is performed on an array,...Ch. 7.13 - What import statement must you include in your...Ch. 7.13 - Write a statement that creates an ArrayList object...Ch. 7.13 - Write a statement that creates an ArrayList object...Ch. 7.13 - Prob. 7.26CPCh. 7.13 - Prob. 7.27CPCh. 7.13 - Prob. 7.28CPCh. 7.13 - Prob. 7.29CPCh. 7.13 - Prob. 7.30CPCh. 7.13 - Prob. 7.31CPCh. 7 - In an array declaration, this indicates the number...Ch. 7 - Each element of an array is accessed by a number...Ch. 7 - The first subscript in an array is always. a. 1 b....Ch. 7 - The last subscript in an array is always. a. 100...Ch. 7 - Array bounds checking happens. a. when the program...Ch. 7 - This array field holds the number of elements that...Ch. 7 - Prob. 7MCCh. 7 - This search algorithm repeatedly divides the...Ch. 7 - Prob. 9MCCh. 7 - When initializing a two-dimensional array, you...Ch. 7 - Prob. 11MCCh. 7 - To delete an item from an ArrayList object, you...Ch. 7 - To determine the number of items stored in an...Ch. 7 - True or False: java does not allow a statement to...Ch. 7 - True or False: An arrays sitze declarator can be a...Ch. 7 - Prob. 16TFCh. 7 - True or False: The subscript of the last element...Ch. 7 - Prob. 18TFCh. 7 - True or False: The Java compiler does not display...Ch. 7 - Prob. 20TFCh. 7 - True or False: The first size declarator in the...Ch. 7 - Prob. 22TFCh. 7 - Prob. 23TFCh. 7 - int[] collection = new int[-20];Ch. 7 - Prob. 2FTECh. 7 - Prob. 3FTECh. 7 - Prob. 4FTECh. 7 - Prob. 5FTECh. 7 - The variable names references an integer array...Ch. 7 - The variables numberArray1 and numberArray2...Ch. 7 - Prob. 3AWCh. 7 - In a program you need to store the populations of...Ch. 7 - In a program you need to store the identification...Ch. 7 - Prob. 6AWCh. 7 - Prob. 7AWCh. 7 - Prob. 8AWCh. 7 - Prob. 9AWCh. 7 - Prob. 10AWCh. 7 - Prob. 11AWCh. 7 - Prob. 1SACh. 7 - Prob. 2SACh. 7 - Prob. 3SACh. 7 - Prob. 4SACh. 7 - Prob. 5SACh. 7 - Prob. 6SACh. 7 - Prob. 7SACh. 7 - Prob. 8SACh. 7 - Prob. 9SACh. 7 - Rainfall Class Write a RainFall class that stores...Ch. 7 - Payroll Class Write a Payroll class that uses the...Ch. 7 - Charge Account Validation Create a class with a...Ch. 7 - Charge Account Modification Modify the charge...Ch. 7 - Prob. 5PCCh. 7 - Drivers License Exam The local Drivers License...Ch. 7 - Magic 8 Ball Write a program that simulates a...Ch. 7 - Grade Book A teacher has five students who have...Ch. 7 - Grade Book Modification Modify the grade book...Ch. 7 - Average Steps Taken A Personal Fitness Tracker is...Ch. 7 - Array Operations Write a program with an array...Ch. 7 - Prob. 12PCCh. 7 - Sorted List of 1994 Gas Prices Note: This...Ch. 7 - Name Search If you have downloaded this books...Ch. 7 - Population Data If you have downloaded this books...Ch. 7 - World Series Champions If you have downloaded this...Ch. 7 - 2D Array Operations Write a program that creates a...Ch. 7 - Prob. 18PCCh. 7 - Trivia Game In this programming challenge, you...Ch. 7 - Prob. 20PC
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
Describe a method that can be used to gather a piece of data such as the users age.
Web Development and Design Foundations with HTML5 (8th Edition)
Suppose that at time t=0, half of a logistic population of l00,000 persons have heard a certain rumor, and that...
Differential Equations: Computing and Modeling (5th Edition), Edwards, Penney & Calvis
Show the output of the following programs. (Hint: Draw a table and list the variables in the columns to trace t...
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Compound Interest When a bank account pays compound interest, it pays interest not only on the principal amount...
Starting Out with Java: Early Objects (6th Edition)
The spreadsheet in Microsoft Excel file Ch01Ex01_U10e.xlsx contains records of employee activity on special pro...
Using MIS (10th Edition)
What is denormalization?
Database Concepts (8th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- The Apgar Medical group keeps a patient file for each doctor in the office. Each record contains the patient's first and last name, home address, and birth year. The records are sorted in ascending birth year order. Write a program so that display a count of the number of patients born each year John Hanson, 23 Elm, 1927Mary Locust, 476 Maple, 1950Susan Monroe, 512 Peachtree, 1957Carol Fortune, 2819 Locust, 1960James Fortune, 2819 Locust, 1963Lawrence Fish, 12 Elm, 1968Janice Weiss, 234 Birch, 1971Henry Garza, 199 Second, 1973Kimberly Swanson, 310 Appletree, 1980Louis Claude, 2716 Third, 1981Jill Fox, 12 Oak, 1985Opal Reynolds, 78 County Line, 1987Francis Dumas, 67 Fourth, 1992Madison Conroy, 23 Fifth, 1996Daniel Moy, 100 Sunset, 1987arrow_forwardIn the student sample program files for this chapter, you will find a text file namedGasPrices.txt. The file contains the weekly average prices for a gallon of gas in the UnitedStates, beginning on April 5th, 1993, and ending on August 26th, 2013. Figure 8-7 shows anexample of the first few lines of the file’s contents:Figure 8-7 The GasPrices.txt fileDescriptionEach line in the file contains the average price for a gallon of gas on a specific date. Each line isformatted in the following way:MM-DD-YYYY:PriceMM is the two-digit month, DD is the two-digit day, and YYYY is the four-digit year. Price is theaverage price per gallon of gas on the specified date.For this assignment, you are to write one or more programs that read the contents of the file andperform the following calculations:Average Price Per Year: Calculate the average price of gas per year, for each year in thefile. (The file’s data starts in April of 1993, and it ends in August 2013. Use the data that ispresent for the…arrow_forwardCargo Container Report. You will be producing a program which will allow the user to generate the container report on the following page in Container Number order or Ship Name order. The program will also the user to lookup the data for any given Container by number. The % cargo weight is the percentage of the cargo of the gross weight (cargo weight/gross weight), % total is the percentage of the cargo for that container of the total amount of cargo unloaded (cargo weight for the container / total cargo unloaded. Hint: you are expected to use methods for your calculations. The accompanying file has the data for the containers unloaded today. The data includes container number int ship name. String tare weight of the container (empty weight) int the gross weight (container plus the cargo). Int You will need to computer the cargo weight as the gross weight minus the tare weight. If you have issues reading the data with the String, you may remove the String. However, you will lose points.…arrow_forward
- File names: color_square.py, chessboard.py, test_squares.py Positions on a chess board are identified by a letter and a number. The letter identifies the column; the number identifies the row. See the image below. You will provide the functions that allow us to determine: if a chessboard square is either black or white, given its coordinates. If the row/column is valid or not for the standard chessboard For example, if we pass in “d” for the column and 4 for the row, your function that determines color should return the string: “BLACK”. If we pass in "k" for the column to your function that validates columns, that function should return the boolean False. Requirements: Your function for validating the column should be able to accept upper or lowercase strings as parameters. Your functions for validating the row should be able to accept integers or strings as parameters. Your function that determines black-or-white may assume that the input has been validated prior to us calling…arrow_forward7. World Series Winners In this chapter's source code folder (available on the Computer Science Portal at www. pearsonhighered.com/gaddis), you will find a text file named WorldSeriesWinners. txt. This file contains a chronological list of the World Series' winning teams from 1903 through 2009. The first line in the file is the name of the team that won in 1903, and the last line is the name of the team that won in 2009. (Note the World Series was not played in 1904 or 1994. There are entries in the file indicating this.) Write a program that reads this file and creates a dictionary in which the keys are the names of the teams, and each key's associated value is the number of times the team has won the World Series. The program should also create a dictionary in which the keys are the years, and each key's associated value is the name of the team that won that year. The program should prompt the user for a year in the range of 1903 through 2009. It should then display the name of the…arrow_forwardIn the input file (see image), grades are listed for the geography tests of group 2b. There have been three tests of which the grades will be included in the half-yearly report that is given to the students before the Christmas break. On each line of the input you can find the name of the student, followed by one or more under scores (’_’). These are succeeded by the grades for the tests, for example: Anne Adema____________6.5 5.5 4.5Bea de Bruin__________6.7 7.2 7.7Chris Cohen___________6.8 7.8 7.3Dirk Dirksen__________1.0 5.0 7.7 The lowest grade possible is a 1, the highest a 10. If somebody missed a test, the grade on the list is a 1. The assignment is to make the report for the geography course of group 2b, which should look like this: Report for group 2bAnne Adema has an average grade of 5.5Bea de Bruin has an average grade of 7.2Chris Cohen has an average grade of 7.3Dirk Dirksen has an average grade of 4.6End of report Use functions to structure the code in Python.arrow_forward
- The attached file USPopulation,txt contains the US population in thousands, during the years 1950 through 1990. The first line in the file contains the population for 1950, the second line contains the population for 1951, and so forth. Write a program that reads the file's contents into a list. The program should display the following data: the average annual growth in population during the time period the year with the greatest increase in population during the time period (highest growth rate) the year with the smallest increase in population during the time period (smallest growth rate) 151868 153982 156393 158956 161884 165069 168088 171187 174149 177135 179979 182992 185771 188483 191141 193526 195576 197457 199399 201385 203984 206827 209284 211357 213342 215465 217563 219760 222095 224567 227225 229466 231664 233792 235825 237924 240133 242289 244499 246819 249623arrow_forwardAn organization has a file named “staff.txt” that has 10 records of staffs having their id, name and salary. Using the concept of structure, you are required to write a program to ask the details of three more staffs and add them in the file. Also, finally you need to display all the records and the total salary paid by the organization.arrow_forward"In the student sample program files for this chapter, you will find a text file named house_prices.csv. The file contains the following data about houses for sale in a city: Price Number of bedrooms Number of bathrooms Square feet of living space The data stored in each line is formatted in the following way: Price,Bedrooms,Bathrooms,SquareFeet Notice that the data items are separated by commas. The first line in the file looks like this: 221900,3,1,1180 The data stored in this line is: Price = $221,900 Bedrooms = 3 Bathrooms = 1 Square feet = 1,180 Design a class that has properties for the four pieces of data. In an application, read the file and store each house’s data in an instance of the class. The class instances should be stored in a List. The application should let the user search the List for the prices of houses with the number of bedrooms within a range, the number of bathrooms within a range, and the square feet of living space within a range. For…arrow_forward
- Assignment 5C: Level Map Creator. There are a variety of ways that game developers store their level layouts. One simple method is to associate level elements with certain symbols, and then storing them in a 2D grid inside a text file. We will use our knowledge of 2D arrays to create a very simple Level Map Creator tool. The program should prompt the user to enter a width and height for the level. Then it should initialize a 2D array and fill every element with the "*" symbol. Afterwards, the user should be given the following options via a menu: 1. Clear Level Re-initialize the 2D array and fill every element with the "*" symbol. 2. Add Platform Prompt the user to enter a starting point and length for the horizontal platform. Replace those elements in the 2D array with the "=" symbol. If the length is longer than the number of columns (or out of bounds), notify the user that this is not possible. 3. Add Item Prompt the user to enter a column and row index. Replace that element in the…arrow_forwardModify the code below to create a "Favorite Video Game List" program that is contained in three files: Game.h Game.cpp Game_List.cpp You will need do to these things as you modify the code and put it into the three files: Create a class called "Game" (instead of "Movie") that contains 3 private variables ("title", "year", and "rating") The "year" is when the game first came out. The "rating" should be from 1 to 5 (5 being the best). Add the appropriate member functions of the class (setters and getters). Continue to use the get_title_upper() function as part of the class, Game, and in the output within the main file, Game_List.cpp. Add the Default Constructor for the class with the member functions of the class. Ignore the Destructor code for now. It's there to show you where it ends up in future code. Don't forget to add the include guard to the .h file Use the scope resolution operator correctly for each file. Don't use the "using namespace std;" for the main…arrow_forwardAssignment 5A: Multiple Frequencies. In the last assignment, we calculated the frequency of a coin flip. This required us to have two separate variables, which we used to record the number of heads and tails. Now that we know about arrays, we can track the frequency of all numbers in a randomly generated sequence. For this program, you will ask the user to provide a range of values (from 1 to that number, inclusive) and how long of a number sequence you want to generate using that number range. You will then generate and save the sequence in an array. After that, you will count the number of times each number occurs in the sequence, and print the frequency of each number. Hints: You can use multiple arrays for this assignment. One array should hold the number sequence, and another could keep track of the frequencies of each number. Sample Output #1: What's the highest number you want to generate?: 5 How Long of a number sequence do you want to generate?: 10 Okay, we'll generate 10…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
EBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT
Programming with Microsoft Visual Basic 2017Computer ScienceISBN:9781337102124Author:Diane ZakPublisher:Cengage Learning
EBK JAVA PROGRAMMING
Computer Science
ISBN:9781337671385
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT
Programming with Microsoft Visual Basic 2017
Computer Science
ISBN:9781337102124
Author:Diane Zak
Publisher:Cengage Learning
C - File I/O; Author: Tutorials Point (India) Ltd.;https://www.youtube.com/watch?v=cEfuwpbGi1k;License: Standard YouTube License, CC-BY
file handling functions in c | fprintf, fscanf, fread, fwrite |; Author: Education 4u;https://www.youtube.com/watch?v=aqeXS1bJihA;License: Standard Youtube License