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1、CPROGRAMMINGLANGUAGEE.E.BUAACHAPTER2：Types,Operators,andExpressionspart3Chapter2Types,Operators,andExpressionsPage2-1TypeofanobjectdeterminesthesetofvaluesitcanhaveandwhatOperationscanbeperformedonit.Operatorsspecifywhatistobedonetovariables.Expressionscombinevariablesandconstantstoproducenewva
2、luesCPROGRAMMINGLANGUAGEE.E.BUAAPage2-12.1VariableNames2.2DataTypesandSizes2.3Constants（常量）2.4Declarations&Expressions2.5ArithmeticOperators（算数运算符）2.6RelationalandLogicalOperators（关系和逻辑运算符）CHAPTER2：Types,Operators,andExpressionsHWCPROGRAMMINGLANGUAGEE.E.BUAAPage2-12.7TypesConversions（类型转换）2.8In
3、crementandDecrementOperators2.9BitwiseOperators（位运算）2.10AssignmentOperatorsandExpressions2.11ConditionalExpressions（条件表达式）2.12PrecedenceandOrderofEvaluation（优先级和结合性）CHAPTER2：Types,Operators,andExpressionsCPROGRAMMINGLANGUAGEE.E.BUAA2.1VariablenamesPage2-2Namesaremadeupofletters,digitsandundersc
4、ore.Thefirstcharactermustbealetterorunderscore.Uppercaseandlowercaselettersaredistinct.Thenumberlimitofcharactersisnotconsist,dependonsystem.（always8characters）Keywordslikeif,else,int,etc.,can’tbeused.It’sagoodhabittochoosethenamerelatedtothepurposeofvariable.BackSum,day,M.D.richie,$45,student_
5、name,student_number,intvalue;k1,k2,k3==m_eng,m_math,m_elecintX,x,Y,y;CHAPTER2：Types,Operators,andExpressionsCPROGRAMMINGLANGUAGEE.E.BUAA2.2DataTypesandSizesPage2-3Basicdatatypeasfollow:typesizepurposechar8bitCapableofholdingoncharacterint16bitAnintegerfloat32bitSingle-precisionfloatingpoint,7v
6、irtualnumbersdouble64bitDouble-precisionfloatingpoint15~16virtualnumbersNote:abovedatabaseonIBMPCsystemCHAPTER2：Types,Operators,andExpressionsCPROGRAMMINGLANGUAGEE.E.BUAAQualifieroftypesPage2-4Short(int),long(int):shortandlongshouldprovidedifferentlengthsofintegers,shortisoften16bit,long32bits,
7、andinteither16or32bitswhichdependondifferentsystem.Therestrictionisthatshortisnolongerthanint,andintisnolongerthanlong.Unsigned(int,char),signed(int,char):Unsignednumberarealwayspositiveorzero.forexample,unsignedcharvariableshavev
