CS16: Programming Assignment 08

Introduction – Important: Read this!

This lab will have you do programming exercises with arrays, strings and vectors.

The TAs and I will be looking for (and grading) programming stylizations, as per the styling guide discussed in class. The lab exercises also have specific requirements. So, it is not enough for your lab to pass Gradescope! Please read the instructions herein CAREFULLY!!!.

Pair programming is OPTIONAL BUT RECOMMENDED for this lab!!! It is a long one!!

Choose who will be the first driver and who will start as navigator, and then remember to switch (at least once) during the lab. But you should probably know the long-term goal too: each partner should participate in both roles in approximately equal parts over the course of the assignment.

DO NOT share passwords. Instead, use scp or email to share files with each other at the end of each work session.

PLEASE MAKE SURE YOU TRADE CONTACT INFORMATION WITH YOUR LAB PARTNER! This means emails, phone numbers, online chat handles, or whatever is necessary to continue working together when you are working remotely (like, say, if one of you goes home for the holiday weekend).

Step 1: Getting Ready

1. Go to Gradescope, navigate to this lab page and create a team for you and your pair partner. Do this by clicking on the blue “Join Groups” button, then follow directions.

2. Decide on initial navigator and driver.

3. Driver, log on to your CSIL account.

4. Open a terminal window and log into the correct machine.

5. Change into your CS 16 directory, create a lab08 directory and change into it.

Step 2: Writing the Programs

This lab will have you create 3 programs: anagram.cpp, histogram.cpp, and split.cpp. You must follow the instructions carefully. It is not enough to pass the Gradescope check as the instructor and the TAs will be checking your submitted program files.

NOTE: IF AN ASSIGNMENT BELOW ASKS YOU TO IMPLEMENT A CERTAIN APPROACH, YOU MUST FOLLOW THOSE INSTRUCTIONS VERY CAREFULLY!!!

AS ALWAYS: DO NOT USE TECHNIQUES/INSTRUCTIONS THAT I HAVE NOT COVERED IN CLASS (or risk a zero grade).

Each corresponds to one of the problems listed below, which make up this lab. Each should be solved in its own file and each must be submitted for full assignment credit.

Note: All these submissions will be checked by the automatic system on Gradescope AND by the instructor and TAs for further evaluation. Details below.

ANAGRAM.CPP

Write a function that determines if two strings are anagrams. An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, for example, the letters in the word “listen” can be re-arranged to spell “silent”.

The function should not be case sensitive and should disregard any punctuation or spaces. Two strings are anagrams if the letters can be rearranged to form each other. For example, “Eleven plus two” is an anagram of “Twelve plus one”. Each string contains one “v”, three “e’s”, two “l’s”, etc. You may use C++ strings, arrays, or vectors to solve this problem. You may not use built-in C++ functions that we have NOT discussed in lecture.

Write a program that inputs two strings and calls your function to determine whether or not the strings are anagrams and prints the result.

Beware of copying solutions from other students or from the Internet. We will be checking on this and if you are caught doing this, you will get a ZERO grade on this lab (at least), possibly a ZERO grade in this CS16 class, and be reported to the department and the university for academic dishonesty and plagiarism.

A session should look like one of the following examples (including whitespace and formatting), with possibly different numbers and numbers of asterisks in the output:

Enter first string:
Eleven plus two
Enter second string:
Twelve plus three
The strings are not anagrams.

OR

Enter first string:
Rats and Mice
Enter second string:
in cat's dream
The strings are anagrams.

The strings printed by the program should include a newline at the end, but no other trailing whitespace (whitespace at the end of the line).’

REQUIREMENT: At least one function.

HINT: One way you could go about this is to create an array of size 26 (one element for each letter of the alphabet) where you would place a count of the number of all the letters in the strings you are analyzing. If this count matches the 2 strings, then they’re anagrams!

HISTOGRAM.CPP

Write a program that outputs a histogram of student grades for an assignment. First, the program will input the number of grades from the user; this can be any positive number. Then, the program should input the grade of each student as an integer and store the grade appropriately. You can do this with either dynamic arrays or vectors. You cannot use techniques and functions that we have not discussed in class.

The program should then compute and generate the histogram. In computing the histogram, the minimum value of a grade is 0 but your program should determine the maximum value entered by the user. Output the histogram to the console.

The scores should be right-justified with width 3 (there should be two spaces before a one-digit number, and one space before a two-digit number). So you can assume that the “grades” inputted will not be composed of more than 3 digits. The histogram should utilize the asterix symbol (“*”) to indicate the histogram count.

Beware of copying solutions from other students or from the Internet. We will be checking on this and if you are caught doing this, you will get a ZERO grade on this lab (at least), possibly a ZERO grade in this CS16 class, and be reported to the department and the university for academic dishonesty and plagiarism.

The program should print a string of text to the terminal before getting each line of input from the user. A session should look like one of the following examples (including whitespace and formatting), with possibly different numbers and numbers of asterisks in the output:

Enter number of grades:
8
Enter grades (each on a new line):
20
30
4
20
30
30
120
20
Histogram:
  4 *
 20 ***
 30 ***
120 *

OR

Enter number of grades:
7
Enter grades (each on a new line):
1
1
100
100
100
99
50
Histogram:
  1 **
 50 *
 99 *
100 ***

REQUIRED: At least one function.

HINT: Creating a histogram has certain similarities with the previous exercise. One extra step you have to take here is to, not just do a count, but also sort out the entries in numerical order before issuing the “*” print outs. You can use the setw() function to help with formatting this last printing part.

SPLIT.CPP

This should look familiar - it is also a homework question!

Given the following function header:

vector<string> split(string target, string delimiter);

implement the function split so that it returns a vector of the strings in target that are separated by the string delimiter.

For example: split(“10,20,30”, “,”) should return a vector with the strings “10”, “20”, and “30”. Similarly, split(“do re mi fa so la ti do”, “ “) should return a vector with the strings “do”, “re”, “mi”, “fa”, “so”, “la”, “ti”, and “do”.

Write a program that inputs two strings and calls your function to split the first target string by the second delimiter string and prints the resulting vector all on line line with elements separated by commas. If one of the sub-strings is an empty string, then it must not be printed.

REQUIRED: You MUST use vectors to write this program. You may not use any C++ functions that we have NOT discussed in lecture. The strings printed by the program should include a newline at the end.

Beware of copying solutions from other students or from the Internet. We will be checking on this and if you are caught doing this, you will get a ZERO grade on this lab (at least), possibly a ZERO grade in this CS16 class, and be reported to the department and the university for academic dishonesty and plagiarism.

The program should print a string of text to the terminal before getting each line of input from the user. A session should look like one of the following examples (including whitespace and formatting), with possibly different numbers in the output:

Enter string to split:
10,20,30
Enter delimiter string:
,
The substrings are: "10", "20", "30"

OR

Enter string to split:
do re mi fa so la ti do
Enter delimiter string:
 
The substrings are: "do", "re", "mi", "fa", "so", "la", "ti", "do"

Note: the fourth line in the second example has a single space character (it is not an empty line).

REQUIRED: At least one function (called split).

Step 3: Submit using GRADESCOPE

BEFORE YOU SUBMIT YOUR FILES: Make sure that you have COMMENTS in your program that would help explain what your program is doing to another person reading your program code. Also make sure that you STYLIZE your program appropriately with correct indendation and so on (see the handout on Piazza re: this) to additionally make it easier on others reading your code. These 2 aspect (having appropriate comments and style) will be graded for an extra 20 points beyond the automatic grade you get from the submission system (called Gradescope). Please remember that you must submit the programs to obtain any credit for the assignment; just completing the programs is not enough.

You may submit this lab multiple times. You should submit only after local compilation does not produce any errors and runs as expected. The score of the last submission uploaded before the deadline will be used as your assignment grade.

We will use Gradescope to grade all your lab/programming assignments from here on. You should have received an email notification with instructions about logging into Gradescope.

Log into https://www.gradescope.com and find our class site: CS16, Spring 2018, Matni. Then navigate to the lab assignment (lab08) and select this assignment. You should see a “Submit Programming Assignment” window pop up. Make sure you have selected “Upload” as Submission Method (not “Github” or “Bitbucket”). Go ahead and submit all of your .cpp files for this assignment and click the green “Upload” button.

When you submit BOTH your .cpp C++ program files, wait for the results (these might take a minute or two). You then will see feedback from Gradescope’s Autograder - both about what passed and what failed, like in the picture here:

You can re-submit your programs (you have to re-submit ALL of them, even if you’re only making changes in one of them) before the deadline. Do this by clicking on the “Resubmit” button on the bottom right corner to make a submission.

When you are done (after submitting), you will be able to see your lab score.

Step 5: Done!

Once your submission receives a score of 100/100, you are done with this assignment. REMEMBER that there are 20 additional points that will be scored according to your proper use of comments and styling. The total will then be normalized to 100 points again (i.e. 120 score will be 100%, 111 score is 92.5%, etc…) to grade this lab.

WE WILL BE CHECKING FOR PLAGIARISM – DO NOT COPY FROM OTHER STUDENTS OR FROM SOURCES ONLINE! USE PROPER CITATION OF CODE THAT YOU DID NOT WRITE! THE CONSEQUENCES WILL - AT MINIMUM - BE A ZERO ON THIS LAB AND POSSIBLY A ZERO IN THIS COURSE AND YOU WILL BE REPORTED TO THE UNIVERSITY.

If you are in the Phelps lab or in CSIL, make sure to log out of the machine before you leave. Also, make sure to close all open programs before you log out. Some programs will not work next time if they are not closed. Remember to save all your open files before you close your text editor.

If you are logged in remotely, you can log out using the exit command:

$ exit

Copyright 2018, Ziad Matni, CS Dept, UC Santa Barbara. Permission to copy for non-commercial, non-profit, educational purposes granted, provided appropriate credit is given; all other rights reserved.