RPGIV 程序员面试初级题.doc

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1、RPGIV程序员面试初级题288    (1) HowdoItrimleadingzeroes?IsthereaBIFtotrimleading0'soffofanumericfieldANDreducethefieldsizeaccordingly? i.e.afieldwithavalueofIwanttoprint:"value:12345" insteadof"value:" or"value:       12345"Answer:Useacombinationof%editand%trim.The%editBIFwilledityournumberanywayyouwish

2、:suppressleadingzeroes,addcommas,etc.The%trimBIFwillstriptheblanksoffthefront.Typicaluseforthisistoinsertanumericamountintoamessage,like"Yourbalanceis$25.00"(2)  %sizegivesmeacompiletimeerroronmyDspecs%sizedoesn'tacceptanexpressioninDspecs; Try %leninstead.(3) %trimisveryslow,Ididaquickietestoft

3、hisonmyheavilyloaded620.5000loopsof%trim(String)."String"containstheliteral"A":Answer:If"String"isdeclared20byteslong,ittakes01.Tryvariablelengthfieldsforyourstringmanipulationchores.(4) HowcanIrightjustifyafield?Answer:ForV4R4andabove:C                  Evalr    output=%trimr(input)Forearlierre

4、leases:C                  Eval     output= %subst(FLDBLANKS:1:%len(input)-%len(%trimr(input)))+Inputwhere"input"and"FLDBLANKS"areequallengthcharacterfields.(5)     HowcanIcentreafield?Basically,takehalfthelengthoftheoutputfield,subtracthalfthelengthofthetrimmedinputfield,putthatmanyblanksatthefr

5、ontoftheoutputfieldandaddtheinputfield.Watchoutforoutputsizelessthaninputsizeandblankinput!dinput                 s            24   inz('             ')doutput               s            40   inzdBLANKS               s     like(output)inzdlen                   s            10i0c                 

6、 eval     len=(%len(output)/2)– %len(%trimr(input))/2c                   if          len+%len(%trimr(input))<= %len(output)c                   eval      output=%subst(BLANKS:1:len)+inputc                  elsec                  eval        output=inputc                  endif(6)   Does%lencountt

7、henullinanullterminatedstring?Answer:No.(7) IgetRNX0112whenIuseL(date)datatypeswithCAnninmydisplayfile.IfyouuseCAnninsteadofCFnn,thiswillhappenbecauseofthewaytheI/ObufferisvaliditycheckedbytheRPGruntime.WhentheuserusesaCFkey