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1、使用COPY，CALL和其他语句来提高编程效率Ⅰ.NancySternⅡ.RobertA.SternⅢ.JamesP.LeyⅠ.霍夫斯特拉大学Ⅱ.拿骚社区学院Ⅲ.威斯康星大学斯托特关键词：COPY,CALL,STRING,UNSTRING,OVERFLOW,POINTER,FD,OF,IN,PIC,IDENTIFICATIONDIVISION,PROGRAM-ID,DATADIVISION,REPLACING,BY,USING,PROCEDUREDIVISION,LINKAGESECTION,W
2、ORKING-STORAGESECTION,EXITPROGRAM,COBOL,STOPRUN,CALLING，DISPLAY，CONTENT，DELIMITED，VALUE，ACCEPT，ON，WITH，MOVE，SUBTRACT,INTO,ALL,END-UNSTRING.参考文献：10thEDITION《COBOLFORTHE21STCENTURY》Ⅰ.NancySternHofstraUniversityⅡ.RobertA.SternNassauCommunityCollegeⅢ.Jam
3、esP.LeyUniversityofWisconsin-StoutCopyright©2003byJohnWiley&Sons,Inc.50ImprovingProgramProductivityUsingTheCOPY,CALL,andOtherStatementsOBJECTIVESTofamiliarizeyouwith1.TheCOPYstatementforcopyingpartsofaprogramthatarestoredinalibrary.2.TheCALLstatement
4、forexecutingcalledprogramsassubroutines.3.TextmanipulationwiththeSTRINGandUNSTRINGstatements.CONTENTSCOPYSTATEMENTIntroductionEntriesthatCanBeCopiedAnExampleTheFullFormatfortheCOPYStatementCALLSTATEMENTWhyUseaCALLStatement?FormatoftheCALLStatementCal
5、ledProgramRequirementsCallingProgramRequirementsExamplesTEXTMANIPULATIONWITHSTRINGANDUNSTRINGSTATEMENTSTheSTRINGStatementTheBasicFormatOVERFLOWOptionPOINTEROptionGeneralRulesforUsingtheSTRINGTheUNSTRINGStatementTheBasicFormatGeneralRulesforUsingtheUN
6、STRINGEND-OF-CHAPTERAIDS50ChapterSummaryKeyTermsCOPYSTATEMENTINTRODUCTIONACOPYstatementisusedtobringintoaprogramaseriesofprewrittenCOBOLentriesthathavebeenstoredinalibrary.Copyingentriesfromalibrary,ratherthancodingthem,hasthefollowingbenefits:(1)itc
7、ouldsaveaprogrammeraconsiderableamountofcodinganddebuggingtime;(2)itpromotesprogramstandardizationsinceallprogramsthatcopyentriesfromalibrarywillbeusingcommondata-namesand/orprocedures;(3)itreducesthetimeittakestomakemodificationsandreducesduplicatio
8、nofeffort;ifachangeneedstobemadetoadataentry,itcanbemadejustoneinthelibrarywithouttheneedtoalterindividualprograms;and(4)libraryentriesareextensivelyannotatedsothattheyaremeaningfultoallusers;thisannotationresultsinbetter-documentedprogramsandsystems
