高级语言程序设计cha.ppt

《高级语言程序设计cha.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、AFirstBookofANSICFourthEditionChapter2GettingStartedinCProgrammingObjectivesIntroductiontoCProgrammingProgrammingStyleDataTypesArithmeticOperations2AFirstBookofANSIC,FourthEditionObjectives(continued)VariablesandDeclarationsCaseStudy:TemperatureConversionCommonProgrammingandCompilerErrors3AFirstBo

2、okofANSIC,FourthEditionIntroductiontoCProgramming4AFirstBookofANSIC,FourthEditionIntroductiontoCProgramming(continued)CprovidesacomprehensivesetoffunctionsStoredinasetoffilesknownasthestandardlibraryThestandardlibraryconsistsof15headerfiles5AFirstBookofANSIC,FourthEditionIntroductiontoCProgramming

3、(continued)6AFirstBookofANSIC,FourthEditionIntroductiontoCProgramming(continued)Identifiers7AFirstBookofANSIC,FourthEditionIdentifiersIdentifiersinCconsistofthreetypes:ReservedwordsStandardidentifiersProgrammer-createdidentifiers8AFirstBookofANSIC,FourthEditionIdentifiers(continued)Reservedword:wo

4、rdthatispredefinedbytheprogramminglanguageforaspecialpurposeandcanonlybeusedinaspecifiedmannerforitsintendedpurposeAlsoreferredtoaskeywordsinC9AFirstBookofANSIC,FourthEditionIdentifiers(continued)10AFirstBookofANSIC,FourthEditionIdentifiers(continued)Standardidentifiers:wordspredefinedinCMostofthe

5、standardidentifiersarethenamesoffunctionsthatareprovidedintheCstandardlibraryItisgoodprogrammingpracticetousestandardidentifiersonlyfortheirintendedpurpose11AFirstBookofANSIC,FourthEditionIdentifiers(continued)12AFirstBookofANSIC,FourthEditionIdentifiers(continued)Programmer-createdidentifiers:sel

6、ectedbytheprogrammerAlsocalledprogrammer-creatednamesUsedfornamingdataandfunctionsMustconformtoC’sidentifierrulesCanbeanycombinationofletters,digits,orunderscores(_)subjecttothefollowingrules:Firstcharactermustbealetterorunderscore(_)Onlyletters,digits,orunderscoresmayfollowtheinitialcharacterBlan

7、kspacesarenotallowedCannotbeareservedword13AFirstBookofANSIC,FourthEditionIdentifiers(continued)ExamplesofinvalidCprogrammer-creatednames:4ab7calculatetotalwhileAlluppercaselettersusedtoindicateaconstantAfunction