cse160-staff@cs.washington.edu cse160_18sp_checkin02

Two of the practice problems for this week will require you to read the HW3 writeup in order to understand what the question is asking.

If you got credit in canvas for any of the problems from checkin 1, then you have successfully created an account and shared your answers with us and should just need to be sure you are logged on to the same account for this checkin. Otherwise, please see "To Use CodingBat" below.

Note: Since CodingBat is used for practicing Java as well as Python, there are a few slightly ugly things it does. 1) It uses the term "array" to refer to lists (e.g. [3, 5, 9]). 2) It uses the name "str" to refer to a variable that is a string. This is a bad name to use for a variable since we know we can also use str() to convert things to strings.

Please do these THREE problems by Sunday April 15, 11pm:

first_last6 H  
get_last_pixel H   (Hint: READ the HW3 writeup before attempting this!)
sum_grid H   (Hint: READ the HW3 writeup before attempting this!)

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To use CodingBat and get credit for the participation assignments we will use it for, you NEED TO CREATE AN ACCOUNT. Do this in the upper right hand corner of this page. Please sign up with your UWnetID email address (e.g. rea2000@uw.edu) and use your real name (Last, First). After creating your account, in order to get credit for the exercises you do, you should select prefs from the upper right hand corner of this page and then select "Teacher Share" at the bottom of the page and enter this email address, followed by clicking the "Share" button:

cse160-staff@cs.washington.edu

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Here are a few suggested practice problems. Do as many of these as you like!

Note: Many of the operations we learned about for lists also apply to strings and vice versa. (e.g. [ ] for indexing and slices, + for concatenating)

Warmups:
missing_char H   front_back H   not_string H   front3 H   front_times H   string_bits H   string_splosion H   last2 H   array_front9 H   array123 H   string_match H  

Strings:
make_out_word  extra_end  first_two  first_half  without_end  non_start  left2  count_hi H  

Lists:
rotate_left3  reverse3  sum2  middle_way  make_ends  has22 

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