debugging your sas programs

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1、CHAPTER10DebuggingYourSASPrograms10.1WritingSASProgramsThatWork27810.2FixingProgramsThatDon’tWork28010.3SearchingfortheMissingSemicolon28210.4Note:INPUTStatementReachedPasttheEndoftheLine28410.5Note:LostCard28610.6Note:InvalidData28810.7Note:MissingValuesWereGenerated29010.8Note:NumericValues

2、HaveBeenConvertedtoCharacter(orViceVersa)29210.9DATAStepProducesWrongResultsbutNoErrorMessage29410.10TheDATAStepDebugger29610.11Error:InvalidOption,Error:TheOptionIsNotRecognized,orError:StatementIsNotValid29810.12Note:VariableIsUninitializedorError:VariableNotFound30010.13SASTruncatesaCharac

3、terVariable30210.14SASStopsintheMiddleofaJob30410.15SASRunsOutofMemoryorDiskSpace306278TheLittleSASBook10.1WritingSASProgramsThatWorkIt’snotalwayseasytowriteaprogramthatworksthefirsttimeyourunit.EvenexperiencedSASprogrammerswilltellyouit’sadelightfulsurprisewhentheirprogramsrunonthefirsttry.T

4、helongerandmorecomplicatedtheprogram,themorelikelyitistohavesyntaxorlogicerrors.Butdon’tdespair,thereareafewguidelinesyoucanfollowthatcanmakeyourprogramsruncorrectlysoonerandhelpyoudiscovererrorsmoreeasily.MakeprogramseasytoreadOnesimplethingyoucandoisdevelopthehabitofwritingprogramsinaneatan

5、dconsistentmanner.Programsthatareeasytoreadareeasiertodebugandwillsaveyoutimeinthelongrun.Thefollowingaresuggestionsonhowtowriteyourprograms:♦PutonlyoneSASstatementonaline.SASallowsyoutoputasmanystatementsonalineasyouwish,whichmaysaveyousomespaceinyourprogram,butthesavedspaceisrarelyworththes

6、acrificeinreadability.♦Useindentiontoshowthedifferentpartsoftheprogram.IndentallstatementswithintheDATAandPROCsteps.ThiswayyoucantellataglancehowmanyDATAandPROCstepsthereareinaprogramandwhichstatementbelongstowhichstep.It’salsohelpfultofurtherindentanystatementsbetweenaDOstatementanditsENDsta

7、tement.♦Usecommentstatementsgenerouslytodocumentyourprograms.Thistakessomedisciplinebutisimportant,especiallyifanyoneelseislikelytoreadoruseyourprogram.Everyonehasadifferentprogrammingstyle,anditisoftenimpossibletofigureoutwhatsomeoneelse’spr