Problem Solving with C++ (10th Edition)
10th Edition
ISBN: 9780134448282
Author: Walter Savitch, Kenrick Mock
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 18, Problem 8PP
You have collected a file of movie ratings where each movie is rated from 1 (bad) to 5 (excellent). The first line of the file is a number that identifies how many ratings are in the file. Each rating then consists of two lines: the name of the movie followed by the numeric rating from 1 to 5. Here is a sample rating file with four unique movies and seven ratings:
| 7 Harry Potter and the Order of the Phoenix 4 Harry Potter and the Order of the Phoenix 5 The Bourne Ultimatum 3 Harry Potter and the Order of the Phoenix 4 The Bourne Ultimatum 4 Wall-E 4 Glitter 1 |
Write a
| Glitter: 1 review, average of 1 / 5 Harry Potter and the Order of the Phoenix: 3 reviews, average of 4.3 / 5 The Bourne Ultimatum: 2 reviews, average of 3.5 / 5 Wall–E: 1 review, average of 4 / 5 |
Use a map or multiple maps to calculate the output. Your map(s) should index from a string representing each movie’s name to integers that store the number of reviews for the movie and the sum of the ratings for the movie.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
The history teacher at your school needs help in grading a True/False test. The students’ IDs and test answers are stored in a file. The first entry in the file contains answers to the test in the form:TFFTFFTTTTFFTFTFTFTTEvery other entry in the file is the student ID, followed by a blank, followed by the student’s responses. For example, the entry:ABC54301 TFTFTFTT TFTFTFFTTFTindicates that the student ID is ABC54301 and the answer to question 1 is True, the answer to question 2 is False, and so on. This student did not answer question 9. The exam has 20 questions, and the class has more than 150 students. Each correct answer is awarded two points, each wrong answer gets one point deducted, and no answer gets zero points.
Write a program that processes the test data. The output should be the student’s ID, followed by the answers, followed by the test score, followed by the test grade. Assume the following grade scale:90%–100%, A; 80%–89.99%, B; 70%–79.99%, C; 60%–69.99%, D; and…
Write a program that reads student information from a text file, then creates a text file that records the course grades of the students and a final grade. Each row of the .txt file contains the Last Name, First Name, Midterm1 score, Midterm2 score, and the Final score of a student, each separated by a space. A sample of the student information is provided in StudentInfo.txt below. Assume the number of students is at least 1 and at most 20.
The program performs the following tasks:
• Read the file name of the .txt file from the user.
• Open the .txt file and read the student information using readline() or readlines().
• Compute the average exam score of each student.
• Assign a letter grade to each student based on the average exam score in the following scale:
◦ A: 90 =< x
◦ B: 80 =< x < 90
◦ C: 70 =< x < 80
◦ D: 60 =< x < 70
◦ F: x < 60
• Output the first names, last names, exam scores, and letter…
In the attached city list.txt file, the names of the provinces in Turkey are given in a single line according to the format given in Figure 1. In the application you will write, write the city names read from this file into the license plate list.txt file in the format shown in Figure 2. In more descriptive terms, citylist.txt is a file given to you. license plate list.txt is the file you will get with your code.
city list:
Adana, Adıyaman, Afyon, Ağrı, Amasya, Ankara, Antalya, Artvin, Aydın, Balıkesir, Bilecik, Bingöl, Bitlis, Bolu, Burdur, Bursa, Çanakkale, Çankırı, Çorum, Denizli, Diyarbakır, Edirne, Elazığ, Erzincan, Erzurum, Eskişehir, Gaziantep, Giresun, Gümüşhane, Hakkari, Hatay, Isparta, İçel (Mersin), İstanbul, İzmir, Kars, Kastamonu, Kayseri, Kırklareli, Kırşehir, Kocaeli, Konya, Kütahya, Malatya, Manisa, Kahramanmaraş, Mardin, Muğla, Muş, Nevşehir, Niğde, Ordu, Rize, Sakarya, Samsun, Siirt, Sinop, Sivas, Tekirdağ, Tokat, Trabzon, Tunceli, Şanlıurfa, Uşak, Van, Yozgat,…
Chapter 18 Solutions
Problem Solving with C++ (10th Edition)
Ch. 18.1 - If v is a vector, what does v.begin() return? What...Ch. 18.1 - If p is an iterator for a vector object v, what is...Ch. 18.1 - Suppose v is a vector of ints. Write a for loop...Ch. 18.1 - Suppose the vector v contains the letters 'A',...Ch. 18.1 - Suppose the vector v contains the letters 'A',...Ch. 18.1 - Suppose you want to run the following code, where...Ch. 18.2 - Prob. 7STECh. 18.2 - Prob. 8STECh. 18.2 - Prob. 9STECh. 18.2 - Prob. 10STE
Ch. 18.2 - Prob. 11STECh. 18.2 - Prob. 12STECh. 18.2 - Prob. 13STECh. 18.2 - Prob. 14STECh. 18.2 - Prob. 15STECh. 18.2 - Prob. 16STECh. 18.3 - Prob. 17STECh. 18.3 - Prob. 18STECh. 18.3 - Prob. 19STECh. 18.3 - Suppose v is an object of the class vectorint. Use...Ch. 18.3 - Prob. 21STECh. 18.3 - Can you use the copy template function with vector...Ch. 18.3 - Prob. 23STECh. 18 - Prob. 1PCh. 18 - Prob. 2PCh. 18 - Prob. 3PCh. 18 - Prob. 4PCh. 18 - Write a program that allows the user to enter any...Ch. 18 - Prob. 3PPCh. 18 - Prob. 5PPCh. 18 - Solution to Programming Project 18.6 In this...Ch. 18 - Prob. 7PPCh. 18 - You have collected a file of movie ratings where...Ch. 18 - Prob. 9PPCh. 18 - Prob. 11PPCh. 18 - Write a program that uses regular expressions to...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
Using the commands SELECT, PROJECT, and JOIN, write a sequence of instructions to answer each of the following ...
Computer Science: An Overview (13th Edition) (What's New in Computer Science)
A criticism of the break statement and the continue statement is that each is unstructured. Actually, break sta...
C How to Program (8th Edition)
Give an example of a data constraint.
Database Concepts (8th Edition)
3.12 (Date Create a class called Date that includes three pieces Of information as data
members—a month (type ...
C++ How to Program (10th Edition)
Write an expression using boolean variables a and b that evaluates to true when only one of a and b is true, an...
Objects First with Java: A Practical Introduction Using BlueJ (6th 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
- I have a text file and I want to read it in C++. variables to use: fname, lname , Id nr, Gender and all third line which is an address The file is : Tommy James 23456731667 Streetname 45 , 154 23 Georgia John Andersson 3456723464 Streetname 12 , 231 32 Las Vegas Kim Larsson 3456312653 Streetnamn 15, 231 56 Florida If we Said the 8th digit in ID number is showing the Gender of the person. By %2== 0 it's Male The output should be: Lname Fname [F] address Is there possible to create a program in C++ with the previously output. lname , fname [F]Adress Without have a problem with Las Vegas word. I have a hard time to figure how I can do the third line in the file. They read to word Las and then the compiler shows terminate called after throwing an instance of ' std::invalid_ argument ' what (): stoi aborted so I figured that the problem I have in one line the city is two word.arrow_forwardWrite a program in Python that reads student information from a text file, then creates a text file that records the course grades of the students and a final grade. Each row of the .txt file contains the Last Name, First Name, Midterm1 score, Midterm2 score, and the Final score of a student, each separated by a space. A sample of the student information is provided in StudentInfo.txt below. Assume the number of students is at least 1 and at most 20. The program performs the following tasks: • Read the file name of the .txt file from the user. • Open the .txt file and read the student information using readline() or readlines(). • Compute the average exam score of each student. • Assign a letter grade to each student based on the average exam score in the following scale: ◦ A: 90 =< x ◦ B: 80 =< x < 90 ◦ C: 70 =< x < 80 ◦ D: 60 =< x < 70 ◦ F: x < 60 • Output the first names, last names, exam scores, and letter grades of the students into a text file named…arrow_forwardAt the end of this and other textbooks, there usually is an index that lists the pages where a certain word appears. In this problem, you will create an index for a text but, instead of page number, you will use the line numbers. You will implement function index() that takes as input the name of a text file and a list of words. For every word in the list, your function will find the lines in the text file where the word occurs and print the corresponding line numbers (where the numbering starts at 1). You should open and read the file only once Create the python function as part of a python program. The data required for the function should be created in the python program and passed to the function. its an exercise pyrthon problem 6.27arrow_forward
- Write a program that asks any number of students to enter their final grade and enables you to store these grades into a grades.txt plain text file. Then it reads the grades from the grades.txt file, and displays the individual grades and their count and average.arrow_forwardWrite a program that receives a filename as user input. The file is structured as multiple lines containing numbers separated by a single space.For example, this would be an acceptable file: 1 2 3 4 5 6 7 2 Your program should open this file and: print all its contents; write the median of all numbers to a new file called result.txt. IMPORTANT NOTES: the median is the element in the middle when you sort the values; the median of values (2, 1, 3) is 2, because when you sort them, you get 1, 2, 3, and 2 is the value in the middle. you can assume there will be no empty lines; there might be any arbitrary number lines in the file; there might be any arbitrary number of elements in a single line; you can assume there will always be an odd number of elements. Example 1: If input is: file1.txt and the contents of file1.txt are: 1 2 2 you should first print the content, and then write 2 to result.txt. Example 2: If input is: file2.txt and the contents of file2.txt are: 1 2 3 4 5 1 7 you…arrow_forwardhere is a text file containing the details of several invoices details. Each invoice uses 3 lines of the file. The first of the three lines is a string giving the date of the invoice, for example “1/5/2021” or “2/6/2021”. The second of the three lines contains double giving the amount, the third line is boolean indicating whether it is paid or not. However, the very first line of the file is an integer number, which says how many invoices are given in the file in the lines which follow it (i.e. how many records will follow). Text file example for two vehicles “invoices.txt” 2 1/5/2021 50.0 true 2/6/2021 20.0 false Write code for a method named processTextFile() which will open the file named ‘invoices.txt’, from which it will read the data of invoices. It will create Invoice objects using this data by calling the constructor that takes the parameters (date, amount, paid) , placing them into an ArrayList invoiceList.arrow_forward
- Write a program that receives a coded message file(Lab3ExtraCreditCT.txt) from your local espionage agent and decodes it into a file using standard English. The problem is your agent forgot to tell you the key used to decode the message. Fortunately, this is a simple substitution code consistently using 1 alphanumeric character to represent another, this is case sensitive. All other characters are not substituted, so a space will always be a space, a – will always be a –, a @ will always be a @, etcetera. You may use the following table to help you, it contains the most common letters used in the English language in descending order. E A R I O T N S L C U D P M H G B F Y W K V X Z J Q 0 5 3 2 4 6 8 1 9 7 Using the following key to convert plaintext to coded text: Plaintext = Now is the time for all good men to come to the aid of their country. Key = THEQUICKBROWNFXJMPSVLAZYDG The file your program outputs should look like this: Coded Text = Fxz bs vku vbnu ixp tww…arrow_forwardThree employees in a company are up for a special pay increase. You are given a file, say Ch3_Ex5Data.txt, with the following data:Miller Andrew 65789.87 5Green Sheila 75892.56 6Sethi Amit 74900.50 6.1 Each input line consists of an employee’s last name, first name, current salary, and percent pay increase. For example, in the first input line, the last name of the employee is Miller, the first name is Andrew, the current salary is 65789.87, and the pay increase is 5%. Write a program that reads data from the specified file and stores the output in the file Ch3_Ex5Output.dat. For each employee, the data must be output in the following form: firstName lastName updatedSalary. Format the output of decimal numbers to two decimal places.arrow_forwardThe owner of Quick Breakfast Cafe (qbc), has provided a text file (see given qbc_menu_prices.txt) that contains menu items, separated by a space, the delimiter. Each record in the file contains the following two fields: Item Description and the Sale Price. Read the file and present the user with a Quick Breakfast Cafe Menu, which may look like this: Quick Breakfast Cafe --Menu-- [1] Coffee $2.20 [2] Tea $1.05 [3] Milk $1.5 [4] Donuts $2.85 [5] Bagel $3.25 [6] Logout Prompt the user for the item and quantity they wish to purchase, which may look like: Enter your selection [1 - 6]: 1 Enter the quantity you wish to purchase: 1 To simplify the program, a user can only purchase one item at a time. A receipt is printed after each transaction, which includes the item, qty and price, followed by the total price including an 8% tax. The receipt may look like: Quick Breakfast Cafe -- Sales Receipt -- Item Qty Cost Coffee 1 $2.20 Total Cost With %8 Sales Tax: 2.38 After each transaction, the…arrow_forward
- Once the modelling has been run, the user should have the option to rerun it. Each time it is run, the output should be saved to disk with the following filename: report_s.txt, where s is a number returned by int(time. time() ) (time. time() is a function from the time module, which you will need to import). This returns the number of seconds since 1/1/70 so that each value of s will be a unique timestamp. For example, the file may look like this: report_1586386072.txt. Part 2: In addition, your program must be able to visualise the information. The user should be able to choose the year and see two-liner graphs based on monthly averages of trade volume and monthly averages of the closing valuearrow_forwardWrite a program that will read in a file of student academic credit data and create a list of students on academic warning. The list of students on warning will be written to a file. Each line of the input file will contain the student name (a single String with no spaces), the number of semester hours earned (an integer), the total quality points earned (a double). The following shows part of a typical data file: Smith 27 83.7 Jones 21 28.35 Walker 96 182.4 Doe 60 150 The program should compute the GPA (grade point or quality point average) for each student (the total quality points divided by the number of semester hours) then write the student information to the output file if that student should be put on academic warning. A student will be on warning if he/she has a GPA less than 1.5 for students with fewer than 30 semester hours credit, 1.75 for students with fewer than 60 semester hours credit, and 2.0 for all other students. The file Warning.java contains a skeleton of the…arrow_forwardWrite a program that will read in a file of student academic credit data and create a list of students on academic warning. The list of students on warning will be written to a file. Each line of the input file will contain the student name (a single String with no spaces), the number of semester hours earned (an integer), the total quality points earned (a double). The following shows part of a typical data file: Smith 27 83.7 Jones 21 28.35 Walker 96 182.4 Doe 60 150 The program should compute the GPA (grade point or quality point average) for each student (the total quality points divided by the number of semester hours) then write the student information to the output file if that student should be put on academic warning. A student will be on warning if he/she has a GPA less than 1.5 for students with fewer than 30 semester hours credit, 1.75 for students with fewer than 60 semester hours credit, and 2.0 for all other students. The file Warning.java contains a skeleton of the…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
EBK JAVA PROGRAMMINGComputer ScienceISBN:9781337671385Author:FARRELLPublisher:CENGAGE LEARNING - CONSIGNMENT
C++ Programming: From Problem Analysis to Program...Computer ScienceISBN:9781337102087Author:D. S. MalikPublisher:Cengage Learning
EBK JAVA PROGRAMMING
Computer Science
ISBN:9781337671385
Author:FARRELL
Publisher:CENGAGE LEARNING - CONSIGNMENT
C++ Programming: From Problem Analysis to Program...
Computer Science
ISBN:9781337102087
Author:D. S. Malik
Publisher:Cengage Learning
Constants, Variables, Data types, Keywords in C Programming Language Tutorial; Author: LearningLad;https://www.youtube.com/watch?v=d7tdL-ZEWdE;License: Standard YouTube License, CC-BY