Ch6 Discussion 04

Learn: scanl.

Find the first 40 partial sums of the sequence 1+1/2+1/3+1/4+… by using scanl.

Exercises

  1. Take in a list [(Float,Bool)] of (gpa, admitted) student data, find all of the pairs where the student was admitted with a gpa of less than 3.0.

  2. Shopping. Given $200 and a list of Int prices of items, find:

    a. How much money remains after buying each item possible, in order from left to right.

    b. A list of how much you have at the start, and then your remaining balance after each item.

    Examples:

     shopA 200 [90,20,60,150,5] == 25
 shopB 200 [90,20,60,150,5] == [200,110,90,30,30,25]

  3. Progress Bar. Given a list of integers (download sizes), produce a list of strings of ‘X’ indicating what percent of the total number has been downloaded so far (so cumulative percent). Each X should represent 5 percent of the total amount. Round the percents down to the nearest multiple of five.

     progressBar [5,8,12,15,10] ==
    ["", "XX","XXXXX","XXXXXXXXXXXXXXXX","XXXXXXXXXXXXXXXXXXXX"]
Last modified August 25, 2021: ap-cs 2019-2020 (4d1c12c)