ASimpleQuizforAlice3.2:AskUserFunctions.

ByLanaDyckunderthedirectionofProfessorSusanRodger

DukeUniversityJune2009,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

Letsstartbycreatingaquizprocedure

ClickontheScene tabandchooseAddSceneProcedure

Namethenewprocedure:quiz.

ClickbackonmyFirstMethod.

NowwewilladdthequiztoMyFirstMethod.

MakesureyouareinMyFirstMethod.

Clickonthis.penguin intheobjecttree.

Dragthesay procedureintotheprocedureeditorandtypein:Timeforaquiz.

Draginasecondsay procedureandtypein:Thatisallfolks!

Clickonthis intheobjecttreeanddragthequiz procedureinbetweenthetwopenguinsaycommands

Step 2: Set Up MyFirstMethod

Nowwewillstartwritingthequizprocedure.Tomakeourcodeeasiertoreadwewilladdincomments.Commentsmakeitpossibletoaddinnotesaboutthecodelike,whatitwilldo,orwhowrotethecode.

Firstclickonthequizproceduretab.

Toaddacommentdraganddropthedoubleslashbuttonintothemethod

Step 3: Comments

Typeinthecommenteditor:Question1

Clickonthis.penguin intheobjecttree,haveitsay:Howmanyanimalsintheworld?andsetthedurationto2seconds.

Step 4: Question #1

Weneedavariabletostorethenumberinformationwegetfromtheuser.

Draginthebuttontoopenvariableoptionbox.

NameitanswerNumber.SelectWholeNumberbesidevaluetype,initializeitto0andclickOK.

Clickontheworld intheobjecttree.Undertheworld'sdetails,functions find“askuserforanumber.”Clickanddragtheaskuserforanumber overthe1andselectother...Enterthestring:Enterthenumberofanimals:

Step 4: Question #1Continued...

Nowwewilldeterminewhathappensiftheanswergiveniscorrectorincorrect.

DraganddropanIf blockfromthebottomofthewindowandsetittotrue.

Step 4: Question #1Continued...

ChooseRelational(WholeNumber)inthetruedrop-downlist.

Select“???==???“->answerNumber...->CustomWholeNumbertoenterinthevalue5.5isthecorrectanswertothisquestion.

Forthisquestionwhenthe“If”statementistrue,theansweriscorrect.Sowewillputourresponsetothecorrectanswerfirst.

Clickonthis.penguin intheobjecttree.UndertheIf:Dragthesay methodandtype:CorrectDragtheturn methodandselect1

Whentheifstatementisfalse,theanswerisincorrect.

UndertheElse:Dragthesay methodandtype:Sorry,thatisnotcorrect.

Step 4: Question #1Continued...

Runyourworldtotaketheonequestionquiz.

Nowletsmakeaquestionthataskstheuserforatrueorfalseresponse.

Dropinacommentandtypein:Question2Clickonpenguin intheobjecttree,haveitsay:Aretheremorechickensthanpenguins?andsetthedurationto2seconds.

Step 5: Question #2

Weneedavariabletostorethebooleaninformationwegetfromtheuser.

Draginvariable buttonfromthebottomofthewindow.

NameitanswerBoolean.

SelectBooleanandClickOK.

Inthepenguin'sfunctions,draganddropthe“getBooleanFromUser”overthetrue.

Typein:Clickontrueandfalse.

Step 5: Question #2Continued...

NowwewilladdinourresponsestotheanswerinanotherIf/Elsestatement.

DraganddropanIf/ElsestatementandselectanswerBoolean.

TheIfquestionacceptsjustthevariablebecauseanswerBooleanisabooleantype.

Step 5: Question #2Continued...

Nowcompletethequestion#2byaddingintheproceduresasshownbelow:

Step 5: Question #2Continued...

Runyourworldtotakethetwoquestionquiz.

Forourfinalquestionwewillasktheusertoenterastring.

Dropinacommentandtypein:Question3

Clickonpenguin intheobjecttree,haveitsay:Whatbuildingarewein?andsetthedurationto2seconds.

Step 6: Question #3

Weneedavariabletostorethestringinformationwegetfromtheuser.

Draginthevariable button.

NameitanswerString.

SelectTextStringand‘hello’ininitializerClickOK.

Note: Astringisasetoflettersorcharacters.Aspaceisconsideredacharactersobecarefulifyouhaveaspaceattheendofyourwordorsentence.

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...

Clickonpenguinintheobjecttreeandaddintheresponsesforwhentheansweriscorrectorincorrectasshownbelow.

Nowplayyourworldandtakethequiz.

Step 6: Question #3Continued...

Part 2: Forcing the Answer

InQuestion1,iftheusermistypestheanswer,wewanttheprogramtoasktheuserfortheansweragainuntilitiscorrect.Rewritequestion1toaddawhileloopandforcetheuserintotheloopwithawrongvaluetostartwith.

Part 3: Limiting Number of Trials

Tolimitthenumberoftrialsto3forexample,createanewvariablenamednumberofTrial,createawhileloopthatallowsthequestiontoshowupaslongasthestudentstrieslessthan3times.Eachtimetheyanswerincorrectly,incrementnumberofTrial by1.Iftheyanswer,correctly,setnumberofTrial toanumbergreaterthan3tobreakoutofthewhileloop(herewechoose5)

Part 4: Score Reporting

Challenge:Toreportscoretouser,wehavetocreatealocalvariablescore forthequizprocedure,initializeitto0,andincrementitby1everytimethestudentansweraquestioncorrectly.Attheend,havethepenguinreportthescore.

Toreportthescoreintheend,dragthepenguinsayprocedureinandtype“Yougot”.

Clickonthedownarrownexttothestringyoujusttypedandselect“Yougot“+???->WholeNumber->score

Part 4: Score Reporting

Clickonthedownarrownexttothe“Yougot“+scorestringandselect“Yougot“+score+??? ->CustomTextString andType”questionscorrect”

Part 4: Score Reporting

Quiz Procedure code