Answered: Create a stream insertion operator and…

Engineering

Computer Science

Create a stream insertion operator and define it.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Please help write the functions (context for the problem in the images): write_X_to_map(filename, row, col): Takes as inputs a string corresponding to a filename, and two non-negative integers representing a row and column index. Reads in the map at the given filename, inserts an X into the given row and column position, then saves the map to a new file with 'new_' prepended to the given filename. You can assume the filename given to the function as argument refers to a file that exists.
Programming
13. Write function quote() that takes as input the name of a file (as a string) and anindex i (as an integer). The file will contain quotes, one per line. The function shouldopen the file, read the file, close the file, and return the i-th quote (i.e. the i-th line in thefile), assuming that the quote numbering starts at 0. Test your solution onfile Wilde_Quotes.txt.>>> quote("Wilde_Quotes.txt", 5)'At twilight, nature is not without loveliness, thoughperhaps its chief use is to illustrate quotations from thepoets.\n'>>> quote("Wilde_Quotes.txt", 0)'A little sincerity is a dangerous thing, and a great dealof it is absolutely fatal.\n'>>> quote("Wilde_Quotes.txt", 23)'Patriotism is the virtue of the vicious. \n'>>>
Q2: Suppose that the file (employee.txt) shown in the figure was stored in the default path, the data stored in this file is employee's name (string), his age (integer), and his salary (double); this data is stored for unknown number of employee. Write a program that uses a function which receives a file stream object of the file (employee.txt) and then it creates another file to store the names of the employees whose ages are over 30 years. T employee.txt - Notepad ~ — o File Edit Format View Help Ahmed 33 Ali 37 hasan 4 mohammed kamal 55 bassam 25 hussam 22 1.5e+06 1.6e+06 1.7e+06 43 1.8e+06 1.9e+06 900000 800000 100% Windows (CRLF) UTF-8
C question
Mark the following statements as true or false 1- The extraction operator => skips all leading whitespace characters when searching for thenext data in the input stream.2-The statement cin => num; is equivalent to the statement num == cin;3- The function ignore is used to skip certain input ina line.4- A value-returning function returns only one value.5-A value-returning function returns only integer values.6- Parameters allow you to use different values cach time the function is called.7- Ifa C-— function does not use parameters, parentheses around the empty parameter list aresull required.8- A function that changes the value of a reference parameter also changes the value of theactual parameter.9- Given the declaration:int list{ 10];the statement:list{5] — list{3] + list{2]:updates the content of the fifth component of the array list.10- A one-dimensional array is an example of a structured data type.
typedef struct { int item_id; char item_name[8]; } tRecord; Given a file containing N of the above records that are shuffled, write the C code that generates a new file with these records sorted in descending (decreasing) item_id. Note that you can assume item_id of each record is a positive number. Write maximum 40 lines of code or upload your answer.
LAB, CONT. 2) book_list.py: download lab4starter_book_list.py from D2L resources. The program summarizes costs of a book list. It uses all of our standard mipo_ex features.* ● The starter file collects book prices into a list, and totals, averages & displays the info. The revised program has to add a feature to collect the book titles into a parallel list, for improved display. * functions: main, inputs, processing, outputs & get_pos_int, with exception handling & restart in main(). Also includes comments - docstring at top and short throughout. This program summarizes a book list. Enter the number of books that you need. Please enter a whole number: three Enter a number greater than 0: 3 Enter the cost of book #1, to the nearest dollar: Please enter a whole number: 25 Enter the cost of book #2, to the nearest dollar: Please enter a whole number: 35 Enter the cost of book #3, to the nearest dollar: Please enter a whole number: 45 Info on 3 Books Needed Book # = $ $ $ Price 25.00 35.00…
*Coding in Python A comma-separated value file stocks_data.csv download contains historical data on the Adjusted Closing Price for 3 stocks daily from Jan 2, 2009 to Dec 31,2018. The stocks are Apple (APPL), Microsoft (MSFT) and IBM (IBM). A snippet from the data file looks like the following: Symbol Date Adj. Close MSFT 4/16/2014 35.807358 MSFT 6/21/2010 20.752356 IBM 2/10/2009 68.930023 AAPL 2/14/2018 164.227203 IBM 6/13/2017 141.24379 IBM 12/26/2017 142.835663 MSFT 4/1/2009 15.053272 AAPL 4/17/2009 15.445643 You can see that each row has a symbol, date and closing price, but the stock data is not sorted by symbol, date or price. Your task has two main parts: Part I For each stock, print the following information to the console and to a text file called stock_summary.txt: the max price and date it occurs the min price and date it occurs the average (mean) price Part 2 Print to the console and append to the output file stock_summary.txt: The stock among the 3…
You have to read a file with 10 integers into an array named read_arr. Assume the file has been associated with the ifstream fin and num is a variable of integer data type. What will work? Group of answer choices (a) for(int i=0;i<10;++i) read_arr[i]=(fin>>num); (b) for(int i=0;i<10;++i) { fin>>num; read_arr[i]=num; } (c) int i=0; while(fin>>num) { read_arr[i]=num; ++i; } Both (b) and (c) ===================== Which of the following is a correct struct declaration? Group of answer choices None of these struct Data { int id; float price; } Data struct { int id; float price; } struct { int id; float price; } Data ====================== Consider the following code fragment. struct Employer{ string name; double salary;};void update (Employer emp){ emp.salary += 1000.00;}; int main(){ Employer e; e.name = "Test"; e.salary = 1000; update(e); cout << e.salary; return 0;}…
Filename: runlength_decoder.py Starter code for data: hw4data.py Download hw4data.py Download hw4data.pyYou must provide a function named decode() that takes a list of RLE-encoded values as its single parameter, and returns a list containing the decoded values with the “runs” expanded. If we were to use Python annotations, the function signature would look similar to this:def decode(data : list) -> list: Run-length encoding (RLE) is a simple, “lossless” compression scheme in which “runs” of data. The same value in consecutive data elements are stored as a single occurrence of the data value, and a count of occurrences for the run. For example, using Python lists, the initial list: [‘P’,‘P’,‘P’,‘P’,‘P’,‘Y’,‘Y’,‘Y’,‘P’,‘G’,‘G’] would be encoded as: ['P', 5, 'Y', 3, ‘P’, 1, ‘G’, 2] So, instead of using 11 “units” of space (if we consider the space for a character/int 1 unit), we only use 8 “units”. In this small example, we don’t achieve much of a savings (and indeed the…
5. In lab12_p5.py a function read_data_file has been created. This function takes in one string parameter that represents the name of the file to be processed. This function reads data from the provided file and returns a dictionary representation of the data stored in this file. The data file is a comma-separated file with the following columns: • County name • Tons of coal produced in 1900 • Tons of coal produced in 1910 © Run Online (1) zbessant Bessant lab12_p1.py x lab12_p5.py x lab12 p3.pyx lab12_p2.py x coal production. 1 # Problem #5 2 3 4 5 6 7 8 # Read the contents of a coal data file and return the data in a dictionary format. def read_data_file(filename): data file open(filename, "r") header_line = data_file.readline () # Read the header line of the file to extract years years = header_line.strip().split(",")[1:] # Extract the years from the header line Tons of coal produced in 1920 9 10 Tons of coal produced in 1930 11 # Initialize an empty dictionary to store the data…