CO5570 Anonymous Questions and Answers

This page lists the various questions and answers. To submit a question, use the anonymous questions page. You may find the keyword index and/or top-level index useful for locating past questions and answers.

We have taken the liberty of making some minor typographical corrections to some of the questions as originally put. Although most of the questions here will have been submitted anonymously, this page also serves to answer some questions of general interest to those on the course.

Question 9:

Submission reference: IN3338

Do we need to add comments to explain our code?

Answer 9:

I will only mark you on functionality, so don't add comments for marking purposes.

Keywords: assign3

Question 8:

Submission reference: IN3337

Hello, I'm trying to get my method to work for translating just opcodes and regs at the moment. I tried testing it by passing a test.mal file with ADD D, A. It should translate to 00101001, but instead translates to null01, so im not sure what part of my code im doing wrong for this to happen.

code deleted

Answer 8:

You are not splitting on commas when there is more than one operand, so you never match one of the register names because it has a comma attached to it.

It would be worth putting some basic println debugging statements in for situations like this that you cannot understand. For instance:

System.err.println(Arrays.toString(segments));

Keywords: assign3

Question 7:

Submission reference: IN3335

Would you be able to create another tester so we can see if our output matches up with yours?

Answer 7:

I am not sure what another file would do that the current one doesn't. There is an example of every instruction in the current one, so you could create your own variations on that and check them against the spec.

Keywords: assign3

Question 6:

Submission reference: IN3334

for the test file you put out

LOADN 127
LOADA	34
ADD  D,  A
SUB A,D
JMP 16
JGT A,4
JLT D,39
JEQ A,125
COPY A , D
COPY D,A
STORE 1

0000000001111111
00011000000000
0010100100
0011011000
01001000000000
01010100000100
01101000100111
01110101111101
1000011000
1000100100
1001000000000001

Answer 6:

No, because all the lines should be exactly 8 bits long. I have provided the file of how the output should look.

Keywords: assign3

Question 5:

Submission reference: IN3333

As an example when I test my assembler with STORE 16 it should output 10010000 00010000 however my program outputs 100100010000 all on one line however its still the correct output is this allowed?

Answer 5:

No. The output must be broken over two lines. Just output the two parts separately rather than joining them together.

Keywords: assign3

Question 4:

Submission reference: IN3331

Are there any .mal files we can use for testing?

Answer 4:

I suggest that you create some of your own for now, but I will release some of mine shortly.

Keywords: assign3

Question 3:

Submission reference: IN3321

Hi, For submitting our solutions, should we create a .zip file containing ONLY the .java files? Not the .class files? In my case I've only 2 java files, "Main.java" and "Assembler.java"; what about cases where someone has other .java files? Will the "automatic testing harness" compile ALL .java files in the folder regardless of their names? Thank you.

Answer 3:

Yes, just your .java files. The testing harness will compile all submitted .java files that are need to build the full program.

Keywords: assign3

Question 2:

Submission reference: IN3291

The command for the assignment (A3) is not working (java.nio.file.NoSuchFileException: prog.mal)

Answer 2:

That means that you are either not passing prog.mal to the main method when you are running the program, or that the file does not exist in the working directory of the program when you are running the program.

If you are using an IDE to run the program then you will need to set up a program configuration that tells the IDE what program arguments to run the program with and where to run it (its working directory). It could be that you haven't done that.

Keywords: assign3 , to

Question 1:

Submission reference: IN6498

Sample question.

Answer 1:

Sample answer.