ASimpleQuizforAlice3.2:AskUserFunctions.

ByLanaDyck

underthedirectionofProfessorSusanRodger

DukeUniversity

June2009,addedPart2July2011,

EditedforAlice3useandPart3,4addedbyAnhTrinhJuly2016

Introduction and Set-up

Thistutorialwilldemonstratehowtocreateasimplequizusingthethreedifferentkindsof“askuser”functions:askuserforanumber,askuserfortrueorfalseandaskuserforastring.

OpenanewAlicegrassworld.

ClickonSetupScene.

ChooseBrowseGalleryByGroup,and

clickAnimals.

AddonePenguin,oneCow,andthree

Chickens intoyourworld.

Arrangeandresizetheobjectsso

theyareeasytosee.

ClickEditCodewhenfinished.

Let'sgetstartedbysettinguptheworld.

Createanewsceneprocedurethatwewilluselatertoholdtheinstructionsforthequiz.

Step 1: Create the Quiz Procedure

Letsstartbycreatingaquiz

procedure

ClickontheScene taband

chooseAddSceneProcedure

Namethenewprocedure:quiz.

ClickbackonmyFirstMethod.

Nowwewilladdthequizto

MyFirstMethod.

MakesureyouareinMyFirstMethod.

Clickonthis.penguin intheobjecttree.

Dragthesay procedureintothe

procedureeditorandtypein:

Timeforaquiz.

Draginasecondsay procedureand

typein:Thatisallfolks!

Clickonthis intheobjecttreeanddrag

thequiz procedureinbetweenthetwo

penguinsaycommands

Step 2: Set Up MyFirstMethod

Nowwewillstartwritingthequizprocedure.Tomakeourcodeeasiertoread

wewilladdincomments.Commentsmakeitpossibletoaddinnotesaboutthe

codelike,whatitwilldo,orwhowrotethecode.

Firstclickonthequizproceduretab.

Toaddacommentdraganddropthedoubleslashbuttonintothe

method

Step 3: Comments

Typeinthecommenteditor:Question1

Clickonthis.penguin intheobjecttree,haveitsay:Howmanyanimalsintheworld?andsetthedurationto2seconds.

Step 4: Question #1

Weneedavariabletostore

thenumberinformation

wegetfromtheuser.

Draginthe

buttontoopenvariable

optionbox.

NameitanswerNumber.SelectWholeNumber

besidevaluetype,initialize

itto0andclickOK.

Clickontheworld intheobjecttree.

Undertheworld'sdetails,functions find“askuserforanumber.”

Clickanddragtheaskuserforanumber overthe1andselectother...

Enterthestring:Enterthenumberofanimals:

Step 4: Question #1Continued...

Nowwewilldeterminewhathappensiftheanswergiveniscorrectorincorrect.

DraganddropanIf blockfromthebottomofthewindowandsetittotrue.

Step 4: Question #1Continued...

ChooseRelational(WholeNumber)in

thetruedrop-downlist.

Select“???==???“->answerNumber...

->CustomWholeNumbertoenterin

thevalue5.5isthecorrectanswertothisquestion.

Forthisquestionwhenthe“If”statementistrue,theansweriscorrect.Sowewill

putourresponsetothecorrectanswerfirst.

Clickonthis.penguin intheobjecttree.

UndertheIf:

Dragthesay methodandtype:CorrectDragtheturn methodandselect1

Whentheifstatementisfalse,theanswerisincorrect.

UndertheElse:

Dragthesay methodandtype:Sorry,thatisnotcorrect.

Step 4: Question #1Continued...

Runyourworldtotakethe

onequestionquiz.

Nowletsmakeaquestionthataskstheuserforatrueorfalseresponse.

Dropinacommentandtypein:Question2Clickonpenguin intheobjecttree,haveitsay:Aretheremorechickensthanpenguins?andsetthedurationto2seconds.

Step 5: Question #2

Weneedavariabletostoretheboolean

informationwegetfromtheuser.

Draginvariable buttonfromthebottomof

thewindow.

NameitanswerBoolean.

SelectBooleanandClickOK.

Inthepenguin'sfunctions,draganddropthe“getBooleanFromUser”

overthetrue.

Typein:Clickontrueandfalse.

Step 5: Question #2Continued...

NowwewilladdinourresponsestotheanswerinanotherIf/Elsestatement.

DraganddropanIf/Else

statementandselectanswerBoolean.

TheIfquestionacceptsjustthevariablebecauseanswerBooleanisaboolean

type.

Step 5: Question #2Continued...

Nowcompletethequestion#2byaddinginthe

proceduresasshownbelow:

Step 5: Question #2Continued...

Runyourworldtotake

thetwoquestionquiz.

Forourfinalquestionwewillasktheusertoenterastring.

Dropinacommentandtypein:Question3

Clickonpenguin intheobjecttree,haveit

say:Whatbuildingarewein?andsetthedurationto2seconds.

Step 6: Question #3

Weneedavariabletostorethestringinformationwegetfromtheuser.

Draginthevariable button.

NameitanswerString.

SelectTextStringand‘hello’ininitializer

ClickOK.

Note: Astringisasetof

lettersorcharacters.Aspaceis

consideredacharactersobe

carefulifyouhaveaspaceat

theendofyourwordor

sentence.

Inthepenguin'sfunctions,

draganddropthegetStringFromUser overthe‘hello’string.

Typein:Enteracronym.

Step 6: Question #3Continued...

NowwewilladdinourresponsestotheanswerinanotherIf/Elsestatement.

DraganddropanIf/Else statementandselecttrue.

ClickthedownarrowintrueandselectTextStringComparison->

???equalsIgnoreCase???-> answerString-> CustomTextString thentypein:LSRC

WithequalsIgnoreCase,theanswerisnotcase-sensitive

Step 6: Question #3Continued...

Clickonpenguinintheobjecttreeandaddintheresponses

forwhentheansweriscorrectorincorrectasshownbelow.

Nowplayyourworldandtakethequiz.

Step 6: Question #3Continued...

Part 2: Forcing the Answer

InQuestion1,iftheusermistypestheanswer,wewantthe

programtoasktheuserfortheansweragainuntilitiscorrect.

Rewritequestion1toaddawhileloopandforcetheuserintothe

loopwithawrongvaluetostartwith.

Part 3: Limiting Number of Trials

Tolimitthenumberoftrialsto3forexample,createanewvariablenamed

numberofTrial,createawhileloopthatallowsthequestiontoshowupaslongas

thestudentstrieslessthan3times.Eachtimetheyanswerincorrectly,increment

numberofTrial by1.Iftheyanswer,correctly,setnumberofTrial toanumbergreater

than3tobreakoutofthewhileloop(herewechoose5)

Part 4: Score Reporting

Challenge:Toreportscoretouser,wehavetocreatealocalvariablescore forthe

quizprocedure,initializeitto0,andincrementitby1everytimethestudent

answeraquestioncorrectly.Attheend,havethepenguinreportthescore.

Toreportthescoreintheend,dragthepenguinsayprocedureinandtype

“Yougot”.

Clickonthedownarrownexttothestringyoujusttypedandselect“Yougot

“+???->WholeNumber->score

Part 4: Score Reporting

Clickonthedownarrownexttothe“Yougot“+scorestringandselect“You

got“+score+??? ->CustomTextString andType”questionscorrect”

Part 4: Score Reporting

Quiz Procedure code