CS 1101 - Cterm 11

Homework 3 - Basic Lists

Due: Thursday, Feb 3 at 5pm

Assignment Goals

• To make sure you can write programs over simple lists

The Assignment

Writing Programs over Lists

1. Write the data definition for list-of-string. Make at least three examples of lists of strings.

2. Write the template for a function over a list-of-string.

3. Write a function got-word? that consumes a list of strings and a string and produces true if the given string occurs at least once in the list.

4. Write a function all-strings-are-racket? that consumes a list of strings and produces true if every string in the list is the string "racket". The function produces false otherwise. (Hint: the empty case should produce true).

5. Write a function strings-of-length-n that consumes a list of strings and a number. The function produces a list of only those strings that have the given number of characters.

6. The WPI Registrar keeps track of a student's grades in a single term using this struct definition:

   ;; a grade-report is a struct
   ;; Here is how you make a grade report:
   ;; (make-grade-report symbol symbol symbol)
   (define-struct grade-report (course1 course2 course3))
   
   ;; example
   (define HAMEL-REPORT (make-grade-report 'A 'A 'NR))
   

   Write the function grades-to-list that consumes a grade report and produces a list of symbols that contains each of the grades in the grade report.

What to Turn In

Using web-based turnin, turn in a single file containing all code and documentation for this assignment. Name your file according to the naming conventions for files. Put both partners' names and wpi login names in a comment at the top of the file.