A suggestion. In homework 1 you set up a system for being able to use VSC on you local machine to work with files on the lab machines. Use that system. In particular, create a new directory within the 245 directory you created in homework 1, presumably called something like "HW2".

Through this assignment you will be building a series of programs that hold information about rocket launches. A description of the columns in this data is given in the following table.

Column number	id	type	description
1	identifier	string	a unique id
2	something	floating point number	I have no idea what this means
3	year	integer	the year
4	month	integer	month 1==January, etc
5	day	integer	day of month. First day of month is 1
6	vehicle	string	the type of rocket
7	variant	string	The variant of the rocket -- for instance, how many boosters does it have
8	flight	string	A descriptor of the flight. Often unintelligible.
9	mission	string	A descriptor of the mission. Often unintelligible.
10	launch site	string	The location of the rocket launch
11	launchpad	string	the place within the location
12	apogee	integer	max distance from earth
13	category	string	I am sure that this is meaningful, just not to me.

Part 1 -- Structs: 30%

• Define a set of structs that holds information about rocket launches as described above. The set must consist of at least two structs, one of which is used by the other. (Below I presume that one of the structs holds the date.
• Use the structs you defined to store the following data.

  '1957-A166',2435849.50,1957,01,11,'Polaris FTV-4','-','Thrust reversal test','-','PM','',10,'Test'
  '1949-A07',2433000.13,1949,03,24,'Aerobee RTV-N-8','-','A12','-','USN49A','',5,'Ionosphe'
  '2018-S18',2458203.68,2018,03,26,'Nudol','-','-','GVM','GIK-1','39A',500,'-'                               

  Just hard code this data into your program. Store the instances of structs you created in 3 different variables (ie, a, b and c). A couple of things to hard code this data. First, use double quotes rater than single quotes to denote strings. Second, '-' indicates that there in no information.Rather than putting a - into your struct instances, leave these values unassigned. Similarly, '' indicates that there is no data. Leave these unassigned as well.
• Write String methods for each struct. (Recall that String() methods in Go are equivalent to toString() in Java.) In your String method you must use fmt.Sprintf (This is not my restriction; it is the way to do this task in Go). Your string method should produce output similar to

              01-11-1957 Polaris FTV-4 Test 2435859.50
              03-24-1949 Aerobee RTV-N-8 Ionosphe 2433005.13
          

  That is, you string method should create a string with the following information
  1. month-day-year -- This should be from the String method of your date struct Assuming you have a Date struct
  2. Vehicle name
  3. category
  4. The sum of the apogee and something fields
• Once you have the structs created, run the following tests:
  • Test if the three instances are equal to each other (I know that they aren't. Show that they are not programmatically.)
  • Create a copy of one of the instances.
  • Test that copy has the same content as the original (it should).
  • Change the value of a field in the copy
  After all of this, are the original and the copy still equal? Would the original and copy still be equal if you were using Java?

Part 2 -- CSV files: 30%

        /home/gtowell/Public/CS245/HW2/hl.csv
    

        package main

import (
	"encoding/csv"
	"fmt"
	"os"
)

func main() {

    // os.Open() opens specific file in
    // read-only mode and this return
    // a pointer of type os.File
    file, err := os.Open("the.csv")

    // Checks for the error
    if err != nil {
        fmt.Printf("Error while reading the file %v\n", err)
    }

    // Closes the file
    defer file.Close()

    // The csv.NewReader() function is called in
    // which the object os.File passed as its parameter
    // and this creates a new csv.Reader that reads
    // from the file
    reader := csv.NewReader(file)

    // ReadAll reads all the records from the CSV file
    // and Returns them as slice of slices of string
    // and an error if any
    records, err := reader.ReadAll()

    // Checks for the error
    if err != nil {
        fmt.Println("Error reading records")
    }

    // Loop to iterate through
    // and print each of the string slice
    for _, eachrecord := range records {
        fmt.Println(eachrecord)
    }
    

Use your Print function -- from part 1 -- to confirm that you are reading this file correctly.

Part 3 -- Slices: 15%

• 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.

Part 3 -- Questions: 25%

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 3: 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.

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 code file but name it README.txt (or just README) then just write in it. You should start by copying the sample readme. Put the README file into the HW2 directory.

Submit

These directions assume that you followed the suggestions above and have a directory named HW2 inside a 245 directory on the UNIX servers.

1. Open a terminal window on your computer (a windows powershell or a Mac terminal)
2. if it is still on your local machine, copy the PDF file of your report into the HW2 directory on the UNIX servers. To do so:
   1. first put the PDF (or test file) into the place where you are in the terminal (or switch the terminal to the place where the PDF file is).
   2. Second copy the file over to UNIX. I assume the pdf file is names "report2.pdf". To do this (assuming things from homework 1)

          scp report2.pdf lab186:245/HW2
      

   3. Use similar scp commands to get any other files from your local machine to the UNIX machines
3. When all of the files are in the HW2 directory and you are still in the 245 directory

       /home/gtowell/bin/submit  -c 245 -p 2 -d HW2
           

   This says to submit for project 2 (-p) everything in the directory HW2 (-d) for the class 245 (-c). You should see listing of all the files you submitted and a message that says "success".
4. 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 HW2 directory within /home/YOU/245/

1. Go to the directory /home/YOU/245
2. Enter /home/gtowell/bin/submit -c 245 -p 2 -d HW2