Through this assignment you will be building a series of programs that hold, and read, information about aircraft takeoffs and landings. The information to hold is given in the following table.

id	type	description
year	integer	the year
month	integer	month 1==January, etc
day	integer	day of month. First day of month is 1
deptime	integer	departure time in 24 clock without a colon. So 715 is 7:15am and 2355 is 11:55pm
arrtime	integer	as with departure time
carrier	string	a short string giving the airline ID.
flightnum	integer	the flight number
arrdelay	arrival delay	in minutes. Negative number indicates early arrival.
depdelay	integer	in minutes
origin	string	ID of the originating airport. If not PHL, then an arrival
destination	string	ID of the destination airport. If not PHL, then a departure.
distance	integer	the length of the flight, in miles
cancelled	boolean	true if the flight was cancelled

Throughout this assignment, all printing should be done using fmt.Printf rather than fmt.Println. For the String() method (below) use fmt.Sprintf.

Part 1 -- Structs: 33%

• Define a set of structs that holds the information in the table above. The set must consist of at least two structs, one of which is used by the other.
• Construct instances of the struct with the following data.

  2008,1,3,1734,1941,WN,23,36,44,JAX,PHL,742,false
  2008,1,3,712,926,WN,1232,11,12,JAX,PHL,742,false
  2008,1,3,1127,1856,WN,1285,21,42,LAS,PHL,2176,true
                  

  Just hard code this data into your program. Store the instances of structs you created in 3 different variables (ie, a, b and c)
• Test if the three instances are equal to each other (I know that they aren't. Show that they are not programmatically.) You can do this with just ==.
• Create a copy of one of the instances. You can do this with just :=
• Test that copy has the same content as the original (it should be). You should be able to use a simple equality thest for this.
• Change the value of a field in the copy
• Are the original and the copy still equal? Would the original and copy still be equal if you were using Java?
• Write String methods for each struct. (String() methods in Go are equivalent to toString() in Java.) In your String method use fmt.Sprintf. Your string method should prduce output similar to (but not identical) to "%+v"

Part 2 -- Slices: 33%

2008,12,12,1834,2149,DL,1687,86,69,PHL,SLC,1926,true
2008,12,12,944,1555,DL,1776,-10,-1,SLC,PHL,1926,true 
2008,12,13,1221,1413,DL,692,-9,-4,ATL,PHL,665,true 
2008,12,5,1523,1804,AA,1768,-21,3,ORD,PHL,678,true 
2008,12,6,1628,1933,AA,1768,-7,-2,ORD,PHL,678,true 
2008,12,7,1520,1804,AA,1768,-21,0,ORD,PHL,678,true 
2008,12,22,545,839,CO,1677,19,10,PHL,IAH,1324,true 
2008,12,22,1920,2314,CO,1776,-16,0,IAH,PHL,1324,true 
2008,12,22,723,952,CO,1777,3,18,PHL,IAH,1324,true 
        

• Create a (sub)slice that has only the first 5 items. This should require one line of code
• Create a (sub)slice that has only the last 5 items. This should require one line of code.
• Create a slice that has the first 3 and the last 2 data items. This will require more than one line of code.

Part 3 -- Questions: 33%

1. From part 1: Explain your answer to "Are the original and the copy equal?" As a part of your explanation discuss how a copy of a struct differs from a similarly made copy of an object in Java?
2. From part 2: Consider the original slice and the slice with the first 5 items. Are the items in position 1 of the two slices equal (the answer should be yes)? If you change the value of a field in the struct in position 1 of the original slice, is it still equal to the item in position 1 of the second slice? Explain why the answer to this question makes sense with respect to your answer to the first question.

3

Electronic Submissions

Your submission will be handed in using the submit script.

If you write your program on computers other than those in the lab, be aware that your program will be graded based on how it runs on the department’s Linux server, not how it runs on your computer. The most likely problem is not submitting everything or hard coding file locations that are not correct on the Linux servers.

Make a README

The easiest place to write your readme is within VSC. Make a file just like a standard java file but name it README.txt then just write in it. You should start by copying the sample readme.

Submit

If you developed this program on your own computer, you should be able to use the systems set up in lab to help get files to Linux. If you did not get SFTP set up within VSC then do the following:

1. Open a terminal window on your computer (a windows powershell or a Mac terminal)
2. Connect to a linux lab machine. A full list of possibly available lab machines is at Machine list. I will assume you are using 165.106.10.186 -- you can use any machine. To connect:

                               ssh YOURNAME@165.106.10.186
                                   or
                               ssh lab186
                          

   Enter your Unix password if/when prompted
3. On the linux computer:

                                cd cs245
                                mkdir a1
                          

   You can change a1 to whatever you like, the directions below assume a1.
4. Leave this terminal window open and connected to Linux, you will use it again in a couple of steps
5. Within VSC open a terminal by going to the Terminal menu and selecting "new terminal"
6. In the Terminal inside of VSC you should be in the directory containing your program. Enter

                                scp * YOURNAME@165.106.10.186:cs245/a1
                          

7. You should get messages on screen showing that each file in this directory has been copied. Make sure you get all of the files you want to submit.
8. Confirm that the copy was successful. Back in the Terminal you opened on the Linux machines (in the first steps)

                                ls a1
                          

   This should show a list of of the files copied in your scp command.
9. When all of the files are in the a1 directory and you are still in the cs245 directory

                                /home/gtowell/bin/submit  -c 245 -p 1 -d a1
                          

   This says to submit for project 1 (-p) everything in the directory a1 (-d) for the class 245 (-c). You should see listing of all the files you submitted and a message that says "success".
10. You can submit multiple times. I will grade only the last submission -- unless you tell me otherwise. The submission process attaches a timestamp so I know when you submitted (down to the second). The closest submission I have ever received to the deadline is 7 seconds.

The submission should include the following items:

README:

This file should follow the format of this sample README

Source files

All of them

Question answers

If separate from readme.

Data files used:

Be sure to include any non-standard data files uses. (Rare)

DO NOT INCLUDE:

Data files that are read from the class site. Do include any of your own data files.

Again: Once you have everything you want to submit in the a1 directory within /home/YOU/cs245/

1. Go to the directory /home/YOU/cs245
2. Enter /home/gtowell/bin/submit -c 245 -p 1 -d a1