Program 2 for Comp 150: Secret Code
This is a pair assignment worth 20 points.
The program should begin with a comment including your names,
a brief description of what the program does and information on any help you received on
the project. If it is entirely your own
work, say so. If anyone helped either of you,
identify them by name and describe how they helped.
Remember to have each team member separately also submit a log to
Blackboard. It is described in the Pairs Administration page:
The log should
indicate your hours working on the homework and an assessment of your
contribution and an assessment of your partner's
contribution. Please name the file 150log2ID.doc, where ID is your
blackboard ID, and the 2 refers to Program 2, so if I were submitting a
log for this assignment, it would
be called 150log2aharrin.doc. Your program grade will not be recorded until after your log submission.
This program will read and write to a file. Choose a number
from 1-5 which will be your encoding secret. You will write two
programs: the encode program and the decode program. Put
them both as separate functions in the same file with names encode()
and decode().
- Choose another programming team in the class to exchange coded messages with. Exchange email addresses.
- Prepare a few line message that you want to send to the other team. This should be an ordinary
text file written in the Idle editor, and given a name ending in .txt
- Read in your file and encode your message by calculating the ord of each
character and SUBTRACTING your chosen secret number. Write the
resulting number to your output file. Put each on a new
line. This is the encoded message
- Write an e-mail message to the other team and tell them your secret number. Attach the encoded file.
- Write
your decoder. You will get an e-mail from the other team.
It will reveal the secret code and the file will be
attached. Decode the message by reading each number from the
file, and convert it back to the
appropriate character by using the information in the email.
Attach the new character to an accumulator string. Remember there
are several transformations needed, since the numbers in the encoded
file will be text in the file, not Python ints!
- When you print your string, it should be the message.
Hand in one file prog2_ID.py identifying you, your partner, who you
received a message from, who you sent a message to, the source code
from both programs, and Python comments containing the coded message you received, and the plain text
message you decoded. Please label each section. Add a
brief paragraph
in a comment block at the end, describing how well everything worked and if you had any
problems.
You must send the encrypted message to the other team no later than
Tuesday night, February 21, to give them time to decode it and turn in
their homework file by Thursday.