高级语言程序设计cha

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1、AFirstBookofANSICFourthEditionChapter2GettingStartedinCProgrammingObjectivesIntroductiontoCProgrammingProgrammingStyleDataTypesArithmeticOperations2AFirstBookofANSIC,FourthEditionObjectives(continued)VariablesandDeclarationsCaseStudy:TemperatureConversionCommonProgrammingandCompilerErrors3AFirstBoo

2、kofANSIC,FourthEditionIntroductiontoCProgramming4AFirstBookofANSIC,FourthEditionIntroductiontoCProgramming(continued)CprovidesacomprehensivesetoffunctionsStoredinasetoffilesknownasthestandardlibraryThestandardlibraryconsistsof15headerfiles5AFirstBookofANSIC,FourthEditionIntroductiontoCProgramming(c

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

4、hatispredefinedbytheprogramminglanguageforaspecialpurposeandcanonlybeusedinaspecifiedmannerforitsintendedpurposeAlsoreferredtoaskeywordsinC9AFirstBookofANSIC,FourthEditionIdentifiers(continued)10AFirstBookofANSIC,FourthEditionIdentifiers(continued)Standardidentifiers:wordspredefinedinCMostofthestan

5、dardidentifiersarethenamesoffunctionsthatareprovidedintheCstandardlibraryItisgoodprogrammingpracticetousestandardidentifiersonlyfortheirintendedpurpose11AFirstBookofANSIC,FourthEditionIdentifiers(continued)12AFirstBookofANSIC,FourthEditionIdentifiers(continued)Programmer-createdidentifiers:selected

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

7、sarenotallowedCannotbeareservedword13AFirstBookofANSIC,FourthEditionIdentifiers(continued)ExamplesofinvalidCprogrammer-creatednames:4ab7calculatetotalwhileAlluppercaselettersusedtoindicateaconstantAfunction