ECS 36a Program 1 Solved

You are helping the library catalog books, and provide books to departments upon request.

The librarian received new shipments of books. The books are identified with an ISBN number, language( "english","french", "chinese","spanish”) and type: “new”, “used”, digital.

They also receive requests for books with different ISBN numbers, languages in either new, used, or digital format. You will only have one unique request item a time, no duplicate requests will be made. (ISBN: this is the number the publisher assigns

of a book)


For example the Library may receive a shipment of 5 books

    • cat newbooks.dat $cat request.dat

Programming Assignment:

Create a program SearchNewBooks.cc that given as command line input newbooks.dat and request.dat and a method of search either binary or linear, creates a file of the number of books found from the request list

$SearchNewBooks newbooks.dat request.dat //run program

$Choice of search method ([l]inear, [b]inary)?

1

CPU time: 10.777 microseconds

$cat found.dat

1

Written:

By running the program multiple times and with inputs of different size explain the pros and cons of linear search versus sorting first and using binary search, with respect to computational complexity. Try to explain if it is possible to determine a ratio between the number of new books and the number of requests to search, that makes either linear search or binary search the best option.





Constraints

Your program must be compatible with C++ only use the standard functions provided by the C++ Standard Library.

Your program cannot be linked to any other external libraries (e.g., Boost).

Your code should try follow the Google C++ Style Guide and be properly commented when necessary.- this is for your benefit and is not required

Grading

Your grade for this assignment will be broken down in several scores:

    • Grading Guide:

        ◦ 75% of graded by autograder ( autograder will not be provided for this program) on csif - if it doesn’t work there you will not get credit for this section
        ◦ 5% Makefile

        ◦ 5 % of grade -

            ▪ good commenting explain what your code is doing to someone who doesn’t know c++
        ◦ Overloading operators

        ◦ Code structure and style

    • 15% written assignment








Suggested work phases


Phase 0: preliminary work

Copy files

In this preliminary phase, copy the few provided files from canvas to your project directory on csif

    • create_testData: a program that generates sample datasets in order to test your program with inputs of various sizes.

        ◦ It expects two command line arguments when being run:

            ▪ The number of newBooks to generate in the output newbooks.dat file

            ▪ The number of requested books to generate in the output requests.dat file

        ◦ For example:

$ create_testData 5 3 $ ls newbooks.dat newbooks.dat

$ create_testData 5 3 $ cat newbooks.dat $ cat request.dat




    • CPPLINT.py -- cpplint, the C++ linter developed by Google to ensure that code conforms to their style guide. I will not grade on this but just want you to see the results you would get.

    • With this python file located in the same directory as your program, you can run the linter as shown in the example below and fix the reported warnings:

    • $ python cpplint.py SearchNewBooks.cc

Done processing SearchNewBooks.cc

    • Total errors found: 0

$



Makefile

Write a simple Makefile that generates the executable SearchNewBooks from the file SearchNewBooks.cc, using g++.

The compiler should be run with the -Wall (enable all warnings) and -Werror (treat all warnings as errors) options.

There should also be a clean rule that removes any generated files (executables, datasets, etc.) and puts the directory back in its original state.

Phase 1: reading in the dataset

In this phase, your program should receive two filenames as command line arguments, the new books file and request file, which the program should read in. The list of new books and list of requested books should should be stored in only two std::vector containers.

Because some code to open these two files will probably be equivalent, you are encouraged to write generic functions in order to avoid code duplication.

New Books file

The first file contains a list new books identified by ISNB number and type, one per line. Each

line has an integer value and two strings.

Example of new books file:

$cat newBooks.dat



You should write a class for representing book as a combination of both the ISNB number, language and type, so that each vector is an object of that class. For debugging purposes, you can overload the << operator to print positional vectors in a pretty way.

Requested Books file

The second file contains a list of Requested books, one per line and expressed as an integer

value, and 2 strings

Example of file:

$ cat request.dat

Phase 2: searching strategies

In this phase, you will need to implement two search strategies in order to find the given requested books in the list of new arrivals: a linear search and a binary search.
The user will choose between using one of these two strategies every time the program is run. If the user input is invalid, they should be asked again, as shown in the example below. The error message should be printed to std::cerr.

    • ./SearchNewBooks newBooks.dat request.dat result1.dat Choice of search method ([l]inear, [b]inary)?

J

Incorrect choice 2

Incorrect choice l

CPU time: 10.777 microseconds

    • 

-------------------------

The general search algorithm is: count = 0

for (b in request)

if (search if b is in newBooks) count += 1

For the binary search, the vector of new books should be sorted by their ISNB number, type, and followed by language beforehand with the following criteria:

ISNB number largest to smallest, if ISNB is equal then by type in order “new”, “used”, “digital”, if type is equal then by language in reverse-alphabetical order.

For the sorting, you must use std::sort. If you overload the < operator of your positional vector class, this function can easily be applied for sorting all of objects contained in a vector container: std::sort(vect_list.begin(), vect_list.end());




Phase 3: processing time measurements

Create a class for counting the number of elapsed microseconds, which you will use to measure the performance of the search strategies. Your class should a high resolution clock, as defined by std::chrono::high_resolution_clock, and convert the time into microseconds for display. Because the linter provided by Google doesn’t like the use of chrono, we have to turn the linter down for the include line specifically as shown in the example.
Here is an example of how to use the relevant functions defined in std::chrono:

#include <chrono> // NOLINT (build/c++11)

...

std::chrono::high_resolution_clock::time_point start; start = std::chrono::high_resolution_clock::now(); ... /* some computation happening */

auto end = std::chrono::high_resolution_clock::now();

double elapsed_us = std::chrono::duration<double, std::micro>(end - start).count(); std::cout << "CPU time: " << elapsed_us << " microseconds"; ...


If you declare ct as an object of such class, your program’s main fragment of code could look like:

print "Choice of search method ([l]inear, [b]inary)?"

get choice from user

ct.Reset()

switch (choice)

case 'l':

run linear search

break;

case 'b':

sort vector of books

run binary search

break;

default:

print "Incorrect choice"

go back to getting user choice

print "CPU time: " << ct.CurrentTime() << " ticks"

Optionally, you can overload the class’ << operator and simply display object ct directly (e.g.:

std::cout << ct << std::endl;).

Phase 4: writing the result

Your program should now receive a third and last command-line argument, specifying the name of the output file.

The number of requested books found in the list of new arrivals should be written in the output file.

$SearchNewBooks newbooks.dat request.dat //run program $Choice of search method ([l]inear, [b]inary)?

1
CPU time: 10.777 microseconds

$cat found.dat

1



Error management

At this point, your program should handle errors properly.

In case of any errors, i.e., if the wrong number of arguments is given or if a file cannot be opened, your program should print the relevant error message on std::cerr as shown in the example below.

$ ./SearchNewBooks

Usage: .SearchNewBooks <newBooks.dat> <request.dat> <result_file.dat> $ ./SearchNewBooksh toto

Usage: .SearchNewBooks <newBooks.dat> <request.dat> <result_file.dat>

    • ./SearchNewBooks toto titi tata Error: cannot open file toto

    • 



Phase 5: measurement analysis

In this last phase, you need to generate various datasets of different sizes and run them with your program. It is advised to run each dataset at least three times and average the running time to make sure the measurements are steady.

Find a collection of datasets that allows to make some analysis regarding the choice between the two searching strategies.

Write everything in a PDF document name report.pdf that you will submit via gradescope.


Submission

Please follow the handin instructions, no late work will be accepted.


Content

You should submit the following files:

    • author.txt: your student ID, last name, first name on one line.

    • Makefile: a Makefile that compiles your source code without any errors or warnings (on CSIF computers), and builds an executable named SearchNewBooks.
    • SearchNewBooks.cc and any other source code files if applicable. For this project, a unique file should be enough though.

Do not submit any other files to csif. Please submit the report to gradescope.

Handin to CSIF

All of your files have to be submitted via handin from one of the CSIF computers:

    • handin yafrid p1 <files>

...

    • 

You can verify that the files have been properly submitted:

$ handin yafrid p1

The following input files have been received:

...

$




Academic integrity

You are expected to write this project from scratch, thus avoiding to use any existing source code available on the Internet, and alone. Asking someone else to write your code (e.g., on website such as Chegg.com) is not acceptable and will result in severe sanctions.

You must specify in your report any sources that you have viewed to help you complete this assignment. All of the submissions will be compared with MOSS to determine if students have excessively collaborated, or have used the work of past students.

Any failure to respect the class rules, as explained above or in the syllabus, or the UC Davis Code of Conduct will automatically result in the matter being transferred to Student Judicial Affairs.