Assignment 3

Question #1

Consider the following rules specifying how a real number x can be described relative to its closest integer i:

     * x == i                      => "x is i"
     * (i - 1/4) <= x <= (i + 1/4) => "x is approximately i"
     * (i - 1/2) < x < i           => "x is less than i"
     * i < x < (i + 1/2)           => "x is greater than i"
     * x == i + 1/2              => "x is between i and i + 1"

Write and document a Python script numdesc.py which takes as a command-line argument a file of positive real numbers (one per line) and outputs for each real its description relative to the rules given above. Your script must work on datafile numdesc1.dat to produce the output given in typescript-file numdesc.script. You may assume that all given files are formatted correctly.

Question #2

Write and document a Python script index1.py which takes as command-line arguments the names of a word-file (one word per line), a text-file, and an index-file, and computes and outputs to the index-file an index describing the lines on which each word in the word-file occurs as part of some word in the text-file, where word-occurrence is case-insensitive. Your script must work on word-file word1.txt and text-file text1.txt to produce index-file index1.txt as specified in typescript-file index1.script.

Hints

You may find the various example scripts in the course notes of use.

In Q2, you may find the string-methods lower() and/or upper() of use.

Submission

Please hand in printed copies of all of your Python script files. You must also submit these files electronically using the submit-assignment command. Note that each script file must have the following comment block at the top, where the X's are replaced with the appropriate information, followed by a docstring briefly describing the program in that script. For instance, my script for Question #1 of this assignment would begin with the following comment block:

#########################################################
##  CS 2500 (Fall 2009), Assignment #3, Question #1    ##
##   Script File Name: numdesc.py                      ##
##       Student Name: Todd Wareham                    ##
##         Login Name: harold                          ##
##              MUN #: 8008765                         ##
#########################################################

You do not have to develop your code on our CS departmental systems. However, as your code will be interpreted and tested on our CS departmental systems as part of the assignment marking process, you should ensure that your code interprets and runs correctly on at least one of these systems.

Additional Notes:

• September 30, 8:35am
  Fixed errors in definition of "is approximately" in Question #1 of Assignment #3.

• August 20, 10:35am
  Assignment #3 posted.

Created: August 20, 2009
Last Modified: September 30, 2009