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USING DIFF TO SEARCH FOR DIFFERENCES IN THE OUTPUT

If you want to compare your output files to the class output files,
you can perform the following on replit. (These commands
create a directory called answer containing the class output files
and then compare the first output file.)

	mkdir answer

At this point, you need to download the answer from the course
website. Then upload the files into replit.

After getting all the files into replit, you can move them into
a folder named answer

	mv out1*.txt answer

After you have run your program and produced an output file named
out1-01.txt, you can compare your output with the class output file
using either:	
	diff out1-01.txt answer/out1-01.txt
or
	diff out1-01.txt answer

The second one works because if "diff" is passed a directory for the last
argument, it assumes that the file name in that directory is the same 
as the first filename.

If the output matches, you can move on to:

	diff out1-02.txt answer

	diff out1-03.txt answer

	diff out1-04.txt answer

	diff out1-05.txt answer

If the two files are both text files and every character matches,
then the output is nothing at all.  This is what you want!

Otherwise, the output from diff identifies differences between lines in
the two files.  "<" marks lines in the first file that do
not match the second file, and ">" marks lines in the second
file that do not match the first file.  Detailed examples
are given below for the "c" = change, "d" = delete, and
"a" = append output.

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An entry such as

  86,87c256,257
  < **  PID  R0  R1  R2  R3  PC  PS  BA LEN  UT  ST   IN
  < **    0   0  20   1   4   2   0  50   3  11   8   (0,sys DisplayRegisters)
  ---
  > **  PID   R0   R1   R2   R3   PC   PS   BA   IN
  > **    0    0   20    1    4    2    0   50   (0,sys DisplayRegisters)

means that after matching some lines, the diff program found a 
difference between lines 86-87 in the first file and lines 256-257
in the second file.  The content of the relevant lines in the
first file is given by the lines prefixed by "< " and
the content of the relevant lines in the second file
are given by the lines prefixed by ">". The "---" line
is just to help you separate the pieces from the two files.

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An entry such as 

65a165,169
> **    13  (0,-----)
> **    14  (0,-----)
> **    15  (0,-----)
> **    16  (0,-----)
> **    17  (0,-----)

means that to make the files look the same, just after line
65 in the first file, you need to add lines 165-169
from the second file.


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An entry such as 

165,169d65
< **    13  (0,-----)
< **    14  (0,-----)
< **    15  (0,-----)
< **    16  (0,-----)
< **    17  (0,-----)
 
means that to make the files look the same, you need to
delete lines 165-169 in the first file.