c运算符的优先级和结合性.doc

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1、个人收集整理勿做商业用途c/c++运算符的优先级和结合性ZZ2010—05—1815:29PrecedenceOperatorDescriptionExampleAssociativity1（）［］-〉。：:++—-GroupingoperatorArrayaccessMemberaccessfromapointerMemberaccessfromanobjectScopingoperatorPost—incrementPost-decrement（a+b）/4;array[4]=2;ptr->age=

2、34;obj.age=34；Class：:age=2；for(i=0；i<10;i++）。..for(i=10;i>0;i--).。。lefttoright2!～++---+＊＆(type)sizeofLogicalnegationBitwisecomplementPre-incrementPre-decrementUnaryminusUnaryplusDereferenceAddressofCasttoagiventypeReturnsizeinbytesif（!done)。.。flags=~flag

3、s;for(i=0;i<10;++i).。。for(i=10;i〉0；--i）。.。inti=-1；inti=+1;data=*ptr;address=＆obj；inti=（int）floatNum;intsize=sizeof(floatNum)；righttoleft3—〉＊。*MemberpointerselectorMemberpointerselectorptr-〉＊var=24;obj.*var=24;lefttoright4*/%MultiplicationDivisionModulusi

4、nti=2*4;floatf=10/3;intrem=4%3;lefttoright5+-AdditionSubtractioninti=2+3；inti=5-1；lefttoright6<<>>BitwiseshiftleftBitwiseshiftrightintflags=33〈〈1；intflags=33〉〉1;lefttoright7〈〈=〉>=Comparisonless—thanComparisonless-than-or—equal—toComparisonif(i<42)...if(i

5、<=42)..。if（i〉42)。。。if（i>=lefttoright个人收集整理勿做商业用途greater-thanComparisongeater-than—or—equal-to42）。.。8==！=Comparisonequal—toComparisonnot—equal—toif（i==42)。。.if（i！=42）...lefttoright9&BitwiseANDflags=flags&42;lefttoright10^BitwiseexclusiveORflags=flags^42；l

6、efttoright11

7、Bitwiseinclusive（normal)ORflags=flags

8、42;lefttoright12&＆LogicalANDif（conditionA&＆conditionB)。。.lefttoright13｜

9、LogicalORif（conditionA

10、

11、conditionB)..。lefttoright14?:Ternaryconditional(if—then—else）inti=(a>b)?a：b;righttoleft15=+=—=＊=/=%=＆=^=｜=<

12、<=〉>=AssignmentoperatorIncrementandassignDecrementandassignMultiplyandassignDivideandassignModuloandassignBitwiseANDandassignBitwiseexclusiveORandassignBitwiseinclusive（normal)ORandassignBitwiseshiftleftandassignBitwiseshiftrightandassigninta=b;a+=3;b-=4

13、;a＊=5；a/=2;a％=3;flags＆=new_flags；flags^=new_flags；flags｜=new_flags;flags〈〈=2;flags〉〉=2;righttoleft16,Sequentialevaluationoperatorfor(i=0,j=0；i〈10；i++,j++）...lefttoright个人收集整理勿做商业用途在使用C语言中，由于运算符优先级而引发的错误既常见又难以发觉。我们常武断地使用了错误