General Notes


Submit the following programs via Gradescope:


    Programming Exercises

  1. Due Date: February 14 Think CS: Chapters 1 & 2; Lab1

    Write a program that prints "Hello, World!" to the screen.

    Hint: See Lab 1.

  2. Due Date: February 15 Think CS: Chapter 4; Lab 1

    Write a program that draws an octagon. Use the sample turtle programs from class to get started.
    program 2

    Note: Whenever submitting a turtle program, choose a name for your file that is not turtle.py. When executing the "import turtle" statement, the computer first looks in the folder where the file is saved for the turtle module and then in the libraries (and other places on the path). So, it thinks the module is itself, causing all kinds of errors. To avoid this, name your program something like "myTurtle.py" or "program2.py".

    Hint: See Lab 1.

  3. Due Date: February 16 Think CS: Chapter 4; Lab 1

    Write a program that implements the pseudocode ("informal high-level description of the operating principle of a computer program or other algorithm") below:

            
              Repeat 36 times: 
                Walk forward 100 steps
                Turn left 145 degrees 
                Walk forward 10 steps 
                Turn right 90 degrees 
                Walk forward 10 steps 
                Turn left 135 degrees 
        	    Walk forward 100 steps 
             
          
    The result should look as follows:

  4. Due Date: February 20 Think CS: Chapter 2

    Write a program that will print "I love Python!" 25 times.

    The output of your program should be:

    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    I love Python!
    
  5. Due Date: February 21 Think CS: Chapter 4

    Write a program that uses the turtle package to draw a 5-pointed star.

    Your output should look like this:

    Hint: For the 5-pointed star, the turtle turns 2 complete revolutions (720 degrees). How much does the turtle need to turn at each point?


  6. Due Date: February 22 Think CS: Chapter 2 & Section 4.4

    Write a program that prints out the numbers from 0 to 14.

    The output of your program should be:

    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    

    Hint: Use a loop and print out the index or loop variable.

  7. Due Date: February 27 Think CS: Chapters 2 & Chapter 9

    Using the string commands introduced in Lab 2, write a Python program that prompts the user for a message, and then prints the message, the message in upper case letters, and the message in lower case letters.

    A sample run of your program should look like:

    Enter a message:  Mihi cura futuri
    Mihi cura futuri
    MIHI CURA FUTURI
    mihi cura futuri
    

    Another run:

    Enter a message:  I love Python!
    I love Python!
    I LOVE PYTHON!
    i love python!
    

    Hint: Your program should be able to take any phrase the user enters and prints it, it in upper case letters, and it in lower case letters. To do that, you need to store the phrase in a variable and print variations of the stored variable.

  8. Due Date: February 28 Think CS: Chapters 2 & Chapter 9

    Write a program that prompts the user to enter a phrase and then prints out the ASCII code of each character in the phrase.

    A sample run of your program should look like:

    Enter a phrase:  I love Python!
    In ASCII:
    73
    32
    108
    111
    118
    101
    32
    80
    121
    116
    104
    111
    110
    33
    

    And another sample run:

    Enter a phrase: ABC
    In ASCII:
    65
    66
    67
    

    Hint: If c is a character, ord(c) returns its ASCII code. For example, if c is 'I', then ord(c) returns 73. See Lab 2.

  9. Due Date: February 29 Think CS: Chapters 2 & Chapter 9


    (The cipher disk above shifts 'A' to 'N', 'B' to 'O', ... 'Z' to 'M', or a shift of 13. From secretcodebreaker.com.)

    Write a program that prompts the user to enter a word and then prints out the word with each letter shifted right by 13. That is, 'a' becomes 'n', 'b' becomes 'o', ... 'y' becomes 'l', and 'z' becomes 'm'.

    Assume that all inputted words are in lower case letters: 'a',...,'z'.

    A sample run of your program should look like:

    Enter a word: zebra
    Your word in code is:
    mroen
    

    Hint: See Caesar Cipher example

  10. Due Date: March 1 Think CS: Chapters 2 & 4

    Write a program that implements the pseudocode below:

        For i = 5, 10, 15, 20, 25, ... ,300:
            Walk forward i steps
            Turn left 91 degrees
    
    Your output should look similar to:

    Hint: See examples of range(start,stop,step) in Lecture 2 notes.


  11. Due Date: March 4 Think CS: Chapters 2 & 4

    Modify the program from Lab 3 to show the shades of blue.

    Your output should look similar to:

  12. Due Date: March 5 Think CS: Chapters 2 & 4

    Write a program that asks the user for the hexcode of a color and then displays a turtle that color.

    A sample run of your program should look like:

    Enter a hex string:  #A922A9
    

    and the output should look similar to:

    Hint: See Section 4.3 for setting the background color and Lab 3 for colors.

  13. Due Date: March 6 Think CS: Chapters 2 & 4

    Draw a cornflower blue pentagon using the turtle module. You can specify the color by name ("cornflowerblue"), by hex string ("#6495ED"), or by RGB values (100, 149, 237). The turtle should be turtle shaped. Your turtle should move forward 100 units, turn left the correct amount of degrees, and then stamp.

    A sample run of your program will look like:

    Hint: See Lab 3.

  14. Due Date: March 7 Think CS: Chapter 2 & Section 8.2

    Write a program that asks the user for a message, then prints out that message in reverse. The reversed output message should be printed with two copies of each character per line.

    A sample run of your program should look like:

    Enter a message: I love Python!
    ! !
    n n
    o o
    h h
    t t
    y y
    P P
    
    e e
    v v
    o o
    l l
    
    I I
    

    Hint: See Lab 2 or Lecture 2 notes.

  15. Due Date: March 8 Think CS: Chapter 4

    Write a program that asks the user for 5 whole (integer) numbers. For each number, turn the turtle left the degrees entered and then the turtle should move forward 100.

    A sample run of your program should look like:

    Enter a number: 270
    Enter a number: 100
    Enter a number: 190
    Enter a number: 200
    Enter a number: 80
    

    and the output should look similar to:


  16. Due Date: March 11 Think CS: Chapter 2 & Section 8.2
    Implement the following piece of pseudocode as a complete program:
        1.  Prompt the user to enter a string and call it s.
        2.  Let ls be the length of s.
        3.  For i in 0, 1, ..., ls-1:
        4.     Print s[:i]
        5.  For i in 0, 1, ..., ls-1:
        6.     Print s[i:]
        5.  Print a closing statement
    		

    A sample run of your program should look like:

    Enter string: a man a plan a canal panama
    
    a
    a
    a m
    a ma
    a man
    a man
    a man a
    a man a
    a man a p
    a man a pl
    a man a pla
    a man a plan
    a man a plan
    a man a plan a
    a man a plan a
    a man a plan a c
    a man a plan a ca
    a man a plan a can
    a man a plan a cana
    a man a plan a canal
    a man a plan a canal
    a man a plan a canal p
    a man a plan a canal pa
    a man a plan a canal pan
    a man a plan a canal pana
    a man a plan a canal panam
    a man a plan a canal panama
     man a plan a canal panama
    man a plan a canal panama
    an a plan a canal panama
    n a plan a canal panama
     a plan a canal panama
    a plan a canal panama
     plan a canal panama
    plan a canal panama
    lan a canal panama
    an a canal panama
    n a canal panama
     a canal panama
    a canal panama
     canal panama
    canal panama
    anal panama
    nal panama
    al panama
    l panama
     panama
    panama
    anama
    nama
    ama
    ma
    a
    
    Thank you for using my program!
  17. Due Date: March 12 Think CS: Chapter 2 & Section 8.2

    Create a program that creates a image of purple and yellow stripes. Your program should ask the user for the size of your image, the name of the output file, and create a .png file of stripes. For example, if the user enters 50, your program should create a 50x50 image, alternating between purple and yellow stripes.

    Your output should look similar to this:

    Enter the size: 50
    Enter output file: stripes50.png
    

    Important!! Before submitting your program for grading, remove commands that show the image; any plt.show() and plt.imshow() commands will give an error! The program is graded on a server on the cloud and does not have a graphics window. Instead, the files your program produces are compared pixel-by-pixel to the answer to check for correctness.

    Hint: See notes from Lecture 4.

  18. Due Date: March 13 Think CS: Section 2.7

    Write a program that implements the pseudocode below:

    1.  Ask the user for the number of hours until the weekend.
    2.  Print out the days until the weekend (days = hours // 24)
    3.  Print out the leftover hours (leftover = hours % 24)
    

    A sample run of your program should look like:

    Enter number of hours:  27
    Days: 1
    Hours: 3
    

    and another sample run:

    Enter number of hours:  52
    Days: 2
    Hours: 4
    

    Hint: See Section 2.7.

  19. Due Date: March 14 Think CS: Chapter 2

    Write a program that converts kilometers to miles. Your program should prompt the user for the number of kilometers and then print out the number of miles.

    A useful formula: miles = 0.621371* kilometers.

    Hint: See Lab 4.


  20. Due Date: March 15 Think CS: Chapter 7 & Section 8.11

    Following Lab 5, write a program that asks the user for the name of a png file and print the number of pixels that are nearly white (the fraction of red, the fraction of green, and the fraction of blue are all above 0.75).

    For example, if your file was of the snow pack in the Sierra Nevada mountains in California in September 2014:

    then a sample run would be:

    Enter file name:  caDrought2014.png
    Snow count is 38010

    Note: for this program, you only need to compute the snow count. Showing the image will confuse the grading script, since it's only expecting the snow count.

  21. Due Date: March 18 Burch's Logic & Circuits

    Write a logical epxression that is equivalent to the circuit that computes the majority of 3 inputs, called in1, in2, in3:

    • If two or more of the inputs are True, then your expression should evaluate to True.
    • Otherwise (two or more of the inputs are False), then your expression should evaluate to False.

    Save your expression to a text file. See Lab 5 for the format for submitting logical expressions to Gradescope.

  22. Due Date: March 19 Burch's Logic & Circuits
    Build a circuit that has the same behavior as a nand gate (i.e. for the same inputs, gives identical output) using only and, or, and not gates.

    Save your expression to a text file. See Lab 5 for the format for submitting logical expressions to Gradescope.

  23. Due Date: March 20 Think CS: Section 10.25

    Write a program that asks the user for a list of nouns (separated by spaces) and approximates the fraction that are plural by counting the fraction that end in "s". Your program should output the total number of words and the fraction that end in "s". Assume that words are separated by spaces (and ignore the possibility of tabs and punctuation between words.)

    A sample run of the program:

    Enter nouns: apple bananas cantalopes durian
    Number of words:  4
    Fraction of your list that is plural is 0.5
    

    And another sample run of the program:

    Enter nouns: hats gloves coats glasses scarves
    Number of words:  5
    Fraction of your list that is plural is 1.0
    

    Hint: Break this problem into pieces:

    1. First, count the number of words in the string the user entered (hint: count the number of spaces). Print out the number of words. Make sure this works before going onto the next part.
    2. Next, ignoring the last word (which is a special case and can be dealt with separately), count the number of words ending in 's' (hint: count the number of "s "). Test that this part works before going on to the next step.
    3. Last, check the last word to see if it ends in "s"-- since it's the last word, the "s" will always occur at the same index in the string.
    Implement (and test!) each part and then go on to the next. See notes from Lecture 3.

  24. Due Date: March 21 Think CS: Chapter 4 & Section 7.4

    The program turtleString.py takes a string as input and uses that string to control what the turtle draws on the screen (inspired by code.org's graph paper programming). Currently, the program processes the following commands:

    • 'F': moves the turtle forward 50 steps
    • 'L': turns the turtle 90 degrees to the left
    • 'R': turns the turtle 90 degrees to the right
    • '^': lifts the pen
    • 'v': lowers the pen
    For example, if the user enters the string "FLFLFLFL^FFFvFLFLFLFL", the turtle would move forward and then turn left. It repeats this 4 times, drawing a square. Next, it lifts the pen and move forward 3, puts the pen back down and draw another square.

    Modify this program to allow the user also to specify with the following symbols:

    • 'B': moves the turtle backwards 50 steps
    • 'S': makes the turtle stamp
    • 'l': turns the turle 45 degrees to the left
    • 'r': turns the turtle 45 degrees to the right
    • 'p': change the pen color to purple

    Hint: See Lecture 4 notes.

  25. Due Date: March 22 Burch's Logic & Circuits

    Build a circuit that has the same behavior as a nor gate (i.e. for the same inputs, gives identical output) using only and, or, and not gates.

    Save your expression to a text file. See Lab 5 for the format for submitting logical expressions to Gradescope.


  26. Due Date: March 25 10-mins to Pandas, DataCamp Pandas

    Modify the program from Lab 6 that displays the NYC historical population data. Your program should ask the user for the borough, an name for the output file, and then display the fraction of the population that has lived in that borough, over time.

    A sample run of the program:

    Enter borough name:  Queens
    Enter output file name:  qFraction.png
    

    The file qFraction.png:

    Important!! Before submitting your program for grading, remove commands that show the image; any plt.show() and plt.imshow() commands will give an error! The program is graded on a server on the cloud and does not have a graphics window.

  27. Due Date: March 26 10-mins to Pandas, DataCamp Pandas

    Write a program that computes the average and maximum population over time for a borough (entered by the user). Your program should assume that the NYC historical population data file, nycHistPop.csv is in the same directory.

    A sample run of your program:

    Enter borough: Staten Island
    Average population:  139814.23076923078
    Maximum population:  474558
    

    and another run:

    Enter borough: Brooklyn
    Average population:  1252437.5384615385
    Maximum population:  2738175
    

    Hint: See Lab 6
    If you are getting errors, check the following:

    • Use skiprows=5 when reading in the data
    • Print out the labels when printing the average and maximum values (follow the sample output exactly)
      Example: print("Average population:", average)
  28. Due Date: March 27 Ubuntu Terminal Reference Sheet

    Write an Unix shell script that prints Hello, World to the screen.

    Submit a single text file containing your shell commands. See Lab 6 for details.

  29. Due Date: March 28 GitHub Guide

    In Lab 6, you created a GitHub account. Submit a text file with the name of your account. The grading script is expecting a file with the format:

    #Name:  Your name
    #Date:  October 2023
    #Account name for my GitHub account
    
    AccountNameGoesHere
    

    Note: it takes a few minutes for a newly created GitHub account to be visible. If you submit to Gradescope and get a message that the account doesn't exist, wait a few minutes and try again.

  30. Due Date: March 29 10-mins to Pandas, DataCamp Pandas

    Modify the program from Lab 7 that displays shelter population over time to:

    • ask the user to specify the input file,
    • ask the user to specify the output file,
    • make a plot of the fraction of the total population that are children over time from the data in input file, and
    • store the plot in the output file the user specified.

    A sample run of the program:

    Enter name of input file:  DHS_Daily_Report.csv
    Enter name of output file:  dhsPlot.png
    

    which produces an output:

    Note: The grading script is expecting that the label (i.e. name of your new column) is "Fraction Children".

    Important!! Before submitting your program for grading, remove commands that show the image; any plt.show() and plt.imshow() commands will give an error! The program is graded on a server on the cloud and does not have a graphics window.


  31. Due Date: April 1 Think CS Section 6.8

    Write a program, using a function main() that prints "Hello, World!" to the screen. See Lab 7.

  32. Due Date: April 2 Think CS Chapter 6 and Chapter 7

    Write a program that asks the user for the name of an image, the name of an output file. Your program should then save the lower left quarter of the image to the output file specified by the user.

    A sample run of your program should look like:

    Enter image file name: hunterLogo.png
    Enter output file: logoLL.png
    

    which would have as input and output:

    Hint: See example program from Lecture 6

    Important!! Before submitting your program for grading, remove commands that show the image; any plt.show() and plt.imshow() commands will give an error! The program is graded on a server on the cloud and does not have a graphics window. Instead, the files your program produces are compared pixel-by-pixel to the answer to check for correctness.

  33. Due Date: April 3 Section 10.25

    Write a program that prompts the user to enter a list of names. Each person's name is separated from the next by a semi-colon and a space ('; ') and the names are entered lastName, firstName (i.e. separated by ', '). Your program should then print out the names, one per line, with the first names first followed by the last names.

    A sample run of your program should look like:

    Please enter your list of names:  Epstein, Susan; St. John, Katherine; Vazquez-Abad, Felisa; Xu, Jia; Zamfirescu, Christina
    
    You entered:
    
    Susan Epstein
    Katherine St. John
    Felisa Vazquez-Abad
    Jia Xu
    Christina Zamfirescu
    
    Thank you for using my name organizer!
          

    Hint: See Section 10.25 for a quick overview of split(). Do this problem in parts: first, split the list by person (what should the delimiter be?). Then, split each of person's name into first and last name (what should the delimiter be here?).

  34. Due Date: April 4 Think CS: Section 7.4

    Write a program that asks the user for the hour of the day (in 24 hour time), and prints

    • "Good Morning" if it is strictly before 12,
    • "Good Afternoon" if it is 12 or greater, but strictly before 17, and
    • "Good Evening" otherwise.

    A sample run:

    Enter hour (in 24 hour time):  11
    Good Morning
    

    Another sample run:

    Enter hour (in 24 hour time):  20
    Good Evening
    

    And another run:

    Enter hour (in 24 hour time):  15
    Good Afternoon
    
  35. Due Date: April 5 10-mins to Pandas, DataCamp Pandas

    Modify the parking ticket program from Lab 8 to do the following:

    • Ask the user for the name of the input file.
    • Ask the user for the attribute (column header) to search by.

    A sample run:

    Enter file name:  tickets.csv
    Enter attribute: Vehicle Color
    The 10 worst offenders are:
    Vehicle Color
    WHITE    156
    GY       112
    BK       104
    BLACK    103
    WH        91
    GREY      55
    BLUE      53
    SILVE     49
    RED       43
    BL        40
    Name: count, dtype: int64
    

    And another run:

    Enter file name:  tickets.csv
    Enter attribute: Vehicle Year
    The 10 worst offenders are:
    Vehicle Year
    0       466
    2015     97
    2013     85
    2014     78
    2012     32
    2011     31
    2010     29
    2008     24
    2005     22
    2004     19
    Name: count, dtype: int64
    
    

  36. Due Date: April 12 Reading: Lab 5

    Logical gates can be used to do arithmetic on binary numbers. For example, we can write a logical circuit whose output is one more than the inputted number. Our inputs are in1 and in2 and the outputs are stored in out1, out2, and out3.


    Here is a table of the inputs and outputs:
    InputsOutputs
    Decimal
    Number
    in1in2Decimal
    Number
    out1out2out3
    000 1001
    101 2010
    210 3011
    311 4100

    Submit a text file with each of the outputs on a separate line:

    #Name:  YourNameHere
    #Date:  November 2023
    #Logical expressions for a 4-bit incrementer
    
    out1 = ...
    out2 = ...
    out3 = ...
    
    Where "..." is replaced by your logical expression (see Lab 5).

    Note: here's a quick review of binary numbers.

  37. Due Date: April 12 Reading: Think CS Chapter 6

    Fill in the missing function, monthString(), in the program, month.py (available on GitHub here). The function should take number between 1 and 12 as a parameter and returns the corresponding month as a string. For example, if the parameter is 1, your function should return "January". If the parameter is 2, your function should return "February", etc.

    Note: The grading scripts are expecting that your function is called monthString(). You need to use that name, since instead of running the entire program, the scripts are "unit testing" the function-- that is, calling that function, in isolation, with differrent inputs to verify that it performs correctly.

    Hint: See notes from Lecture 7 and Lab 8.

  38. Due Date: April 12 Reading: 10-mins to Pandas, DataCamp Pandas

    Write a program that asks the user for a CSV of collision data (see note below about obtaining reported collisions from NYC OpenData). Your program should then list the top three contributing factors for the primary vehichle of collisions ("CONTRIBUTING FACTOR VEHICLE 1") in the file.

    A sample run:

    Enter CSV file name:  collisions.csv
    Top three contributing factors for collisions:
    CONTRIBUTING FACTOR VEHICLE 1
    Driver Inattention/Distraction    1127
    Unspecified                       1083
    Failure to Yield Right-of-Way      351
    Name: count, dtype: int64
    

    This assignment uses collision data collected and made publicly by New York City Open Data, and can be found at:

    https://data.cityofnewyork.us/Public-Safety/NYPD-Motor-Vehicle-Collisions/h9gi-nx95.
    Since the files are quite large, use the "Filter" option and choose your birthday in 2022 and "Export" (in CSV format) all collisions for that day. We will use this data set for future programs, so, instead of downloading the test files multiple times, save a copy for future use.

    Hint: See Lab 8 for accessing and analyzing structured data.

  39. Due Date: April 12 Reading: Think CS Chapter 6

    Write two functions, triangle() and nestedTriangle(). Both functions take two parameters: a turtle and an edge length. The pseudocode for triangle() is:

        triangle(t, length):
        1.  If length > 10:
        2.     Repeat 3 times:
        3.         Move t, the turtle, forward length steps.
        4.         Turn t left 120 degrees.
        5.     Call triangle with t and length/2.
    

    The pseudocode for nestedTriangle() is very similar:

        nestedTriangle(t, length):
        1.  If length > 10:
        2.     Repeat 3 times:
        3.         Move t, the turtle, forward length steps.
        4.         Turn t left 120 degrees.
        5.         Call nestedTriangle with t and length/2.
    

    A template program, nestingTrianges.py, is available here on GitHub. The grading script does not run the whole program, but instead tests your function separately ('unit tests') to determine correctness. As such, the function names must match exactly (else, the scripts cannot find it). Make sure to use the function names from the GitHub program (it is expecting triangle() and nestedTriangle()).

    A sample run:

    Enter edge length:  160
    

    which would produce:

  40. Due Date: April 12 Reading: Think CS: Chapter 6

    Write a function, computeFare(), that takes as two parameters: the zone and the ticket type, and returns the Long Island Railroad fare.

    • If the zone is 1 and the ticket type is "peak", the fare is 8.75.
    • If the zone is 1 and the ticket type is "off-peak", the fare is 6.25.
    • If the zone is 2 or 3 and the ticket type is "peak", the fare is 10.25.
    • If the zone is 2 or 3 and the ticket type is "off-peak", the fare is 7.50.
    • If the zone is 4 and the ticket type is "peak", the fare is 12.00.
    • If the zone is 4 and the ticket type is "off-peak", the fare is 8.75.
    • If the zone is 5, 6, or 7 and the ticket type is "peak", the fare is 13.50.
    • If the zone is 5, 6, or 7 and the ticket type is "off-peak", the fare is 9.75.
    • If the zone is greater than 8, return a negative number (since your calculator does not handle inputs that high).

    A template program, LIRRtransit.py, is available here on GitHub. The grading script does not run the whole program, but instead tests your function separately ('unit tests') to determine correctness. As such, the name of the function must match exactly (else, the scripts cannot find it).

    A sample run:

    Enter the number of zones: 4
    Enter the ticket type (peak/off-peak): off-peak
    The fare is 8.75
    

    And another:

    Enter the number of zones: 6
    Enter the ticket type (peak/off-peak): peak
    The fare is 13.5
    

    Hint: See Lab 8.


  41. Due Date: April 15 Reading: Folium Tutorial

    Write a program that uses folium to make a map of New York City. Your map should be centered at (40.75, -74.125) and include a marker for the main campus of Hunter College. The HTML file your program creates should be called: nycMap.html

    Hint: See Lab 9.

  42. Due Date: April 16 Reading: Folium Tutorial

    Using folium (see Lab 9), write a program that asks the user for the name of a CSV file, name of the output file, and creates a map with markers for all the traffic collisions from the input file. You can use the same dataset from Problem 38.

    A sample run:

    Enter CSV file name:  collisions.csv
    Enter output file:  myMap.html
    

    which would produce the HTML file:

    (The demo above is for March 18, 2016 using the time the collision occurred ("TIME") to label each marker and changed the underlying map with the option: tiles="Cartodb Positron" when creating the map. When submitting to Gradescope, only specify the location of the marker; do not add any labels.)

    When running your program locally, you need to check that the "LATITUDE" and "LONGITUDE" values are non-empty. To do this, first we fill the empty values with zeros using the fillna(0) function. Then in our loop, we should only add markers to the map when the values are not zero. You can use this file to get started.

    Note: For this data set, the names of the columns are "LATITUDE" and "LONGITUDE" (unlike the previous map problem, where the data was stored with "Latitude" and "Longitude").

  43. Due Date: April 17 Reading: Think CS: Chapter 3

    The program, errorsHex.py, has lots of errors. Fix the errors and submit the modified program.

    Hint: See Lab 9.

  44. Due Date: April 18 Reading: Think CS: Chapter 6 and Folium Tutorial

    Fill in the following functions in a program that maps GIS data from NYC OpenData CSV files and marks the current location and closest point:

    • getData() that asks the user for the name of the CSV and returns a dataframe of the contents.
    • getColumnNames() that asks the user for the exact name of the columns that contains the latitude and longitude and returns those values as a tuple. Since the NYC OpenData files use different names for the columns in different datasets (such as "Lat", "Latitude", "LATITUDE" for latitude), the program asks for the name of the column as well as the name of the data file.
    • getLocale() asks the user for latitude and longitude of the user's current location and returns those floating points numbers.
    • computeDist() that computes the squared distance between two points (x1,y1) and (x2,y2):
      (x1-x2)2 + (y1-y2)2

    A sample run to find the closest CUNY campus to the Brooklyn Navy Yard:

    Enter CSV file name: cunyLocations.csv
    Enter column name for latitude: Latitude
    Enter column name for longitude: Longitude
    Enter current latitude: 40.7021
    Enter current longitude: -73.9708
    Enter output file: closestCUNY.html
    

    which would produce the html file:

    A template program, closestPoint.py, is available here on GitHub. The grading script does not run the whole program, but instead runs each of your functions separately ('unit tests') to determine correctness. As such, the names of the functions must match exactly the ones listed above (else, the scripts cannot find them).

    Hint: See Lab 9.

  45. Due Date: April 19 Reading: Think CS: Chapter 6

    Fill in the missing functions:

    • average(region): Takes a region of an image and returns the average red, green, and blue values across the region.
    • setRegion(region,r,g,b): Takes a region of an image and red, green, and blue values, r, g, b. Sets the region so that all points have red values of r, green values of g, and blue values of b.

    The functions are part of a program that averages smaller and smaller regions of an image until the underlying scene is visible (inspired by koalas to the max).

    For example, if you inputted our favorite image, you would see (left to right):

    and finally:

    A template program, averageImage.py, is available here on GitHub. The grading script does not run the whole program, but instead runs each of your functions separately ('unit tests') to determine correctness. As such, the names of the functions must match exactly the ones listed above (else, the scripts cannot find them).

    Hint: See notes from Lecture 8.


  46. Due Date: April 22 Reading: Chapter 8

    Modify the program from Lab 10 that makes a turtle walk 100 times. Each "walk" is 10 steps forward and the turtle can turn 0,1,2,...,359 degrees (chosen randomly) at the beginning of each walk.

    A sample run of your program:

  47. Due Date: April 23 Reading: Chapter 8

    Write a program that asks the user to enter a string. If the user enters an empty string, your program should continue prompting the user for a new string until they enter a non-empty string. Your program should then print out the string entered.

    A sample run of your program:

    Enter a non-empty string:
    That was empty.  Try again.
    Enter a non-empty string:
    That was empty.  Try again.
    Enter a non-empty string: Mihi cura futuri
    You entered: Mihi cura futuri
    
  48. Due Date: April 24 Reading: MIPS Wikibooks

    Write a simplified machine language program that prints: Hello, World!

    See Lab 11 for details on submitting the simplified machine language programs.

    Hint: You may find the following table useful:


    (Image from wikimedia commons)

    Hint: The grading scripts are matching the phrase exactly, so, you need to include the spacing and punctuation.

  49. Due Date: May 6 Reading: MIPS Wikibooks

    Write a simplified machine language program that has register $s0 loop through the numbers 0, 5, 10, ..., 50.

    See Lab 11 for details on submitting the simplified machine language programs.

  50. Due Date: May 7 Reading: Ubuntu Terminal Reference Sheet

    Write an Unix shell script that does the following:

    • Creates a directory, projectFiles.
    • Creates 3 additional directories (as subdirectories of projectFiles): source, data, and results.
    Submit a single text file containing your shell commands. See Lab 10.

    Hint: See Lab 10.


  51. Due Date: May 8 Reading: Ubuntu Terminal Reference Sheet

    Using Unix shell commands, write a script that counts the number of .py files in current working directory.

    Hint: See Lab 11.

  52. Due Date: May 9 Reading: Cplusplus Tutorial

    Write a C++ program that prints "Hello, World!" and "Hello, C++!" in two separate lines to the screen.

    Hint: See Lab 12 for getting started with C++.

  53. Due Date: May 10 Reading: Cplusplus Tutorial

    Write a C++ program that will print "Mihi cura futuri" 10 times.

    The output of your program should be:

    Mihi cura futuri
    Mihi cura futuri
    Mihi cura futuri
    Mihi cura futuri
    Mihi cura futuri
    Mihi cura futuri
    Mihi cura futuri
    Mihi cura futuri
    Mihi cura futuri
    Mihi cura futuri
    

    Hint: See Lab 12 for getting started with C++.

  54. Due Date: May 13 Reading: Cplusplus Tutorial

    Write a C++ program that converts kilometers to miles. Your program should prompt the user for the number of kilometers and then print out the number of miles.

    A useful formula: miles = 0.621371* kilometers.

    See Lab 4 for designing Input-Process-Output programs and Lab 12 for getting started with C++.

  55. Due Date: May 14 Reading: Cplusplus Tutorial

    Write a C++ program program that asks the user for a number and draws a triangle of that height and width using 'character graphics'.

    A sample run:

    Enter a number:  6
    *
    **
    ***
    ****
    *****
    ******
    

    Another sample run:

    Enter a number:  3
    *
    **
    ***
    

  56. Due Date: May 15 Reading: Cplusplus Tutorial

    Write a C++ program that asks the user for the month of the year (as a number), and prints

    • "Happy Winter" if it is strictly before 3 or strictly larger than 11,
    • "Happy Spring" if it is 3 or greater, but strictly before 7, and
    • "Happy Summer" if it is 7 or greater, but strictly before 9, and
    • "Happy Fall" otherwise.

    A sample run:

    Enter month (as a number):  12
    Happy Winter
    

    Another sample run:

    Enter month (as a number):  8
    Happy Summer
    

    And another run:

    Enter month (as a number):  11
    Happy Fall
    
  57. Due Date: May 16 Reading: Cplusplus Tutorial

    Write a C++ program that asks the user for a year, and continue asking until the number entered that is 2018 or earlier.

    A sample run:

    Enter year: 2023
    Year must be 2018 or earlier
    Enter year: 2025
    Year must be 2018 or earlier
    Enter year: 2000
    You entered:  2000
    

    Hint: See Lab 10 for similar programs in Python. Rewrite in C++.

  58. Due Date: May 17 Reading: Cplusplus Tutorial

    Write a complete C++ program that prints the change in population of the the United States:

        p = p + Bp - Dp
    
    where p is the population, B is the birth rate of 12.4 births for every 1000 people (12.4/1000) each year, and D is the death rate of 8.4 for every 1000 people (8.4/1000). In 2017, the population of United States was 325.7 million. Your program should ask the user for the number of years and print expected population over those years starting from 2017. Each line should have: the year and the population (in millions).

    A sample run:

    Please enter the number of years: 10
    Year 2017  325.70
    Year 2018  327.00
    Year 2019  328.31
    Year 2020  329.62
    Year 2021  330.94
    Year 2022  332.27
    Year 2023  333.60
    Year 2024  334.93
    Year 2025  336.27
    Year 2026  337.61
    
  59. Due Date: May 20 Reading: Cplusplus Tutorial

    Write a C++ program that asks the user for a whole number between -31 and 31 and prints out the number in "two's complement" notation, using the following algorithm:

    1. Ask the user for a number, n.
    2. If the number is negative, print a 1 and let x = 32 + n.
    3. If the number is not negative, print a 0 and let x = n.
    4. Let b = 16.
    5. While b > 0.5:
      1. If x >= b then print 1, otherwise print 0
      2. Let x be the remainder of dividing x by b.
      3. Let b be b/2.
    6. Print a new line ('\n').

    A sample run:

    Enter a number:  8
    001000
    

    Another run:

    Enter a number: -1
    111111