Whyis()funWhatdelightsmayitspractitionerexpectashisreward?Firstisthesheerjoyofmakingthings.Asthechilddelightsinhismudpie,sotheadultenjoysbuildingthings,especiallythingsofhisowndesign.Secondisthepleasureofmakingthingsthatareusefultootherpeople.Thirdisthefascinationoffashioningcomplexpuzzle-likeobjectsofinterlockingmovingpartsandwatchingthemworkinsubtlecycles,playingouttheconsequencesofprinciplesbuiltinfromthebeginning.Fourthisthejoyofalwayslearning,whichspringsfromthe()natureofthetask.Inonewayoranothertheproblemisevernew,anditssolverlearnssomething:sometimes(),sometimestheoretical,andsometimesboth.Finally,thereisthedelightofworkinginsuchatractablemedium.The(请作答此空),likethepoet,worksonlyslightlyremovedfrompurethought-stuff.Fewmediaofcreationaresoflexible,soeasytopolishandrework,soreadilycapableofrealizinggrandconceptualstructures.Yettheprogram(),unlikethepoet'swords,isrealinthesensethatitmovesandworks,producingvisibleoutputsseparatefromtheconstructitself.Itprintsresults,drawspictures,producessounds,movesarms.Programmingthenisfunbecauseitgratifiescreativelongingsbuiltdeepwithinusanddelightssensibilitieswehaveincommonwithallmen.