CPSC 231: Assignment 1 (Due Monday, July 8)

Weighting = 5%

Total marks = 16

Letter break downs

Letter	Score out of 16
A	16
A-	15
B+	14
B	13
B-	12
C+	11
C	10
C-	9
D+	8
D	7
D-	6
F	0 - 5

Introduction to Unix Part 1: Common commands

On Unix workstations in the Computer Science lab complete the following steps:

Login onto computers
Start a script session
Show the contents of your home directory
Make a new directory called “231”
Enter the newly created ‘231’ directory
Show the contents of the newly created ‘231’ directory
Go to the official directory for CPSC 231 (/home/231)
Show the contents of the CPSC 231 directory
Go to the directory for assignment 1 (/home/231/assignments/assignment1)
Show the contents of the assignment 1 directory
Show the contents of the a1 file
Copy this file to the newly created ‘231’ directory that you created (in your home directory).
Go to the newly created ‘231’ directory (in your home directory)
Show the contents of the newly created ‘231’ directory.
End the script session
Print out the script and hand it in (along with the rest of your assignment 1 submission) – make sure you read the submission guidelines!

Learning objectives:

Familiarization with the basic commands that you will use on an everyday basis in the Computer Science Unix environment.

Grading:

1 mark maximum for all steps properly completed
0.5 marks if a step was missed
0.0 marks if two or more steps were missed

Introduction to Unix Part 2: Using a text editor

Using the Unix text editor of your choice (e.g., Emacs, Xmacs) type a brief document (approximately a page or 2 – 3 paragraphs) that describes what the area of Computer Science is all about. Note: This report can either be based upon your perceptions and opinions or you can base it upon the material covered in lecture. If you choose the latter case just be sure that you put it in your own words (and don’t merely cut and paste the notes!)

Print out this document and hand it in (along with the rest of your Assignment 1 submission) – make sure you read the submission guidelines!

Learning objectives

Being able to create, edit and save documents with a popular Unix text editor

Grading

You will either receive 1 mark for an assignment that fulfills all of the above requirements or 0 for one that does not.

Number systems and logic

Number conversion: Perform the necessary number conversions in order to fill in the missing values in the table below (4 marks).

Number system
Value in decimal	Value in binary	Value in Octal	Value in Hexadecimal
8	1000	10
10	1010		A
24.5		30.4	18.8
	11111111	377	FF

Non-decimal based math: Perform the following non-decimal based additions and subtractions (2 marks).

0	1	1	1	1	0	0	1
		+	1		-	1	1

Complements: Perform the necessary number conversions in order to fill in the missing values in the table below (3 marks).

Number system
Unsigned binary value	One’s complement value	Two’ complement value
0111 1011	0111 1011
-01011		10101
	1000	1001

Logic: Perform the following logical operations (5 marks)

(AND)

	T	F	T	F	T
AND	T	T	T	F	T

(OR)

	T	F	T	F	T
OR	T	T	T	F	T

(XOR)

	T	F	T	F	T
XOR	T	T	T	F	T

(NAND)

	T	F	T	F	T
NAND	T	T	T	F	T

(NOR)

	T	F	T	F	T
NOR	T	T	T	F	T

Learning objectives

Getting comfortable working with non-decimal based number systems
Being able to convert between numbers systems that are frequently used on computers
Understanding how negative numbers are represented on the computer
Understanding common logical operations