COMP 348代做、Java编程设计代写

日期：2025-04-06 09:08

COMP 348: ASSIGNMENT3

Notethatassignmentsmustbesubmittedontimeinordertoreceivedfull

value.Appropriatelatepenalties(<1hour=10%,<24hours=25%)will

beapplied,asappropriate.

DESCRIPTION: It’stimetotryalittlefunctionalprogramming.Inthiscase,

yourjobwillbetodevelopaverysimpleinformationsystemwithClojure.REALLYsimple.Infact,

allitwillreallydoisloaddatafromadiskfile.Thisdatawillthenformagradebookfile(very

similartowhatyouseeonMoodle).Thegradebook containsoneflatfilethatcontainsalistofall

studentsintheclasswiththeirgrades foreveryassignment/examcomponent.

grades.txt:<studentid,firstname,lastname,[component,weight,grade]…>

Thenumberofcomponentsmayvaryfromfiletofile,however,itwouldbethesameforallstudents

inasinglefile.

Asamplefileisgiveninthefollowing:

40543437,John,Doe,A1,10,95.5,A2,10,100,MIDTERM,20,80,FINAL,60,70

40543476,Jane,Doe,A1,10,100,A2,10,100,MIDTERM,20,90,FINAL,60,100

40545276,Michael,J,A1,10,99,A2,10,98,MIDTERM,20,97,FINAL,60,76

40544545,Yo,McLovin,A1,10,70,A2,10,70,MIDTERM,20,60,FINAL,60,60

...

Notethatno[syntax]errorcheckingisrequiredforanyofthedatafiles.Youcanassumethatthey

havebeencreatedproperly, andallfieldsarepresent.Eachfieldisseparatedbya“,”andcontainsa

non-emptystring.

Itissuggestedthatyouuseavectorforeachstudentandincludeallgradecomponentsinamap.

Theclasslististhenstoredinalist.

Seethemapify functionintheattachedcode. Usingthatfunction,youmaystorethegradesforeach

studentinamap.ForexamplethegradeforJohnDoewouldbesomethinglike:

{"A1" {:weight 10, :grade 95.5},

"A2" {:weight 10, :grade 100},

"MIDTERM" {:weight 20, :grade 80},

"FINAL" {:weight 60, :grade 70}}

Sonowyouhavetodosomethingwithyourdata.Youwillprovidethefollowingmenutoallowthe

usertoperformactionsonthedata:

*** Grade Processing Menu ***

-----------------------------

1. List Names

2. Display Student Record by Id

3. Display Student Record by Lastname

4. Display Component

5. Display Total

6. Exit

Enter an option?

Asamplecodetemplateimplementingtheabovemenustructureisprovidedwiththisassignment.

Theoptionswillworkasfollows

1. TheListnamesoptionsimplydisplaysthelistofstudentsfollowedbyalineindicatinghow

manystudentsarethereinthefile. Example:

(40543437 John Doe)

(40543476 Jane Doe)

(40545276 Michael J)

(40544545 Yo McLovin)

4 students in total.

2. DisplayStudentrecordbyId,letstheuseenterthestudentidandthendisplaysthestudent

recordasinthefollowing.Youmayformatthestudentrecordasyouwishorsimplydump

therecordasillustrated inthefollowingexample:

Enter the Student ID: 40543437

Found:

[40543437 John Doe {A1 {:weight 10, :grade 95.5} A2 {:weight 10, :grade

100} MIDTERM {:weight 20, :grade 80} FINAL {:weight 60, :grade 70}}]

Ifthestudentidisnon-existent,anerrormessagewillbedisplayed.Example:

Enter the Student ID: 9999

Invalid student ID or student ID not found.

3. DisplayStudentrecordbylastname,searchesforthelastnameanddisplays thestudent

recordsformatchedstudents.Example:

Enter the Last Name: Doe

Found:

[40543437 John Doe {A1 {:weight 10, :grade 95.5} A2 {:weight 10, :grade

100} MIDTERM {:weight 20, :grade 80} FINAL {:weight 60, :grade 70}}]

[440543476 Jane Doe {A1 {:weight 10, :grade 100} A2 {:weight 10, :grade

100} MIDTERM {:weight 20, :grade 90} FINAL {:weight 60, :grade 100}}]

Total 2 record(s) found.

4. Usingdisplaycomponentmethod,theuserentersthecomponentnameandthesystemwill

displaytheresultandtheclassaverage (roundedto1digit) forthatspecificcomponent.

Example:

Enter Component Name: A1

(40543437 95.5)

(40543476 100)

(40545276 76)

(40544545 60)

Average: 91.1

5. Thedisplaytotalmenuoptionsdisplays theindividualgradesandthecoursetotalforeach

studentfollowedbytheclassaverage,asillustratedinthefollowing example.The‘schema’

ofthedataisdisplayedontop,listedallcoursecomponentinalphabeticalorder. The

studentlistisalsosortedbystudentidinascendingorder,Example:

(STUDID A1 A2 FINAL MIDTERM TOTAL)

(40543437 95.5 100 80 70 77.6)

(40543476 100 100 90 100 98)

(40544545 70 70 60 60 62)

(40545276 99 98 97 76 84.7)

(AVG 91.1 92 81.6 76.5 80.6)

6. Finally,iftheExitoptionisenteredtheprogramwillterminatewitha“GoodBye”message.

Otherwise,themenuwillbedisplayedagain.

Sothat’sthebasicidea.Herearesomeadditionalpointstokeepinmind:

1. Youdonotwanttoloadthedataeachtimearequestismade.So,beforethemenuis

displayedthefirsttime,yourdatashouldbeloadedandstoredinappropriatedata

structures.So,assumingaloadData functioninamodulecalleddb,aninvocationlikethe

followingwouldcreateandloadadatastructurecalledgradesDB

(def gradesDB (db/loadData "grades.txt"))

ThegradesDB datastructurecanthenbepassedasinputtoanyfunctionthatneedstoact

onthedata.Notethat,onceitisloaded,thedataisneverupdated.

Youmayalternativelyuseclojure’sread-csv function.

2. Asafunctionallanguage,Clojureusesrecursion.Ifpossible,usethemap,reduce and

filter functionswheneveryoucan.(Notethatyoumaysometimeshavetowriteyour

ownrecursivefunctionswhensomethinguniqueisrequired).

3. ThisisaClojureassignment,notaJavaassignment.SoJavashouldnotbeusedforanymain

functionality.Thatsaid,itmightbenecessarytouseJavaclassestoconverttexttonumbers

inordertodothecalculations.Anexamplewiththemap functionisshownbelow:

(map #(Integer/parseInt %) ["6" "2" "3"])

4. Itisworthnoting,however,thatthiscanalsobedonewithClojure’sread-string

function.Thiscanbeusedtotranslate“numeric”strings,includingfloatingpointvalues.So

wecoulddosomethinglike:

(* 4 (read-string "4.5")) ; = 18

5. TheI/Ointhisassignmentistrivial.WhileitispossibletousecomplexI/Otechniques,itis

notnecessarytoreadthetextfiles.Instead,youshouldjustuseslurp,aClojurefunction

thatwillreadatextfileintoastring,asin:

(slurp "myFile.txt")

6. Fortheinputfromtheuser,theread-line functioncanbeused.Ifyouprintaprompt

stringtothescreen(e.g.,“pleaseentertheciry”,youmaywanttouse(flush) before

(read-line) sothatthepromptisnotcached(andthereforenotdisplayed).

7. Forstringprocessing,youwillwanttouseclojure.string.Youcanviewtheonline

docsforalistofstringfunctionsandexamples(https://clojuredocs.org/clojure.string)

8. Donotworryaboutefficiency.Therearewaystomakethisprogram(boththedata

managementandthemenu)moreefficient,butthatisnotourfocushere.Wejustwantyou

tousebasicfunctionalitytotrytogeteverythingworking.

DELIVERABLES:Yoursubmissionwillhavejust3sourcefiles.The“main”filewillbecalledapp.clj

andwillbeusedtosimplyloadtheinformationinthetextfilesintoagroupofdatastructuresand

thenpassthisdatatothefunctionthatwillprovidetheinitialfunctionalityfortheapp.Thesecond

file,menu.clj will,asthenameimplies,providetheinterfacetotheuser.Thethirdfilewillbe

calleddb.clj andwillcontainallofthedatamanagementcode(loading,organizing,etc.).Donot

includeanydatafileswithyoursubmission,asthemarkerswillprovidetheirown.

PROJECTENVIRONMENT:ItiseasytorunasingleClojurefilefromthecommandline(i.e.,clojure

myfile.clj).Itbecomesalittlemoretediouswhentheappismadeupofmultiplefiles.In

practice,largeprojectsaretypicallybuiltwithatoolcalledLeinengen.UseofLeiningen,however,is

overkill forthiskindofassignmentandwilllikelymakebuildingandtestingmoreproblematicfor

moststudents.

Wewillthereforekeepthingsassimpleaspossible.Yourfiles,bothsourcecodeanddatawillbe

locatedinthecurrentfolder.Eachofthethreesourcefileslistedabovewilldefineitsown

namespace.Forexample:

(ns app

(:require [db])

(:require [menu]))

IMPORTANT: Thiswillallowthefiles/modulestointeractwithoneanother.However,Clojure

accessesmodulesrelativetothecurrentCLASSPATH.Bydefault,theCLASSPATH willprobablynot

besetonyourmachine,soClojurewillfailtorunyourprogram,witherrorssayingthatitcannot

findyourmodules.ThesimplestthingtodoistosimplysettheCLASSPATH toincludethecurrent

folder(thisiswhatthegraderswilldo).FromtheLinuxcommandline,youcanjustsay

export CLASSPATH=./

Oncethisisdone,youcanrunyourappsimplybytyping

clojure app.clj

NotethatthisCLASSPATH variableistemporaryandwouldhavetobereseteachtimeyoustart

Linux.Ifyouwantittobeautomaticallyconfiguredeverytimeyoulogin,youcouldaddtheexport

linetothe.bashrc fileinyourloginfolder.

SUBMISSION: Onceyouarereadytosubmit,placethe.cljfilesintoazipfile.Thenameofthezipfile

willconsistof"a3"+lastname+firstname+studentID+".zip",usingtheunderscorecharacter"_"

astheseparator.Forexample,ifyournameisJohnSmithandyourIDis"123456",thenyourzipfile

wouldbecombinedintoafilecalleda3_Smith_John_123456.zip".Thefinalzipfilewillbesubmitted

throughthecoursewebsiteonMoodle.Yousimplyuploadthefileusingthelinkontheassignment

webpage.

FINALNOTE:Whileyoumaytalktootherstudentsabouttheassignment,allcodemustbewritten

individually.Anysharingofassignmentcodewilllikelyleadtoanunpleasantoutcome.

Good Luck