Objective-C Operators

Objective-C operators, like those in other programming languages, let you perform operations on variables (hence the name). Objective-C provides many operators, and keeping track of all of them can be difficult as you program your iPhone or Mac OS X apps. Use the following tables to jog your memory as to which operator accomplishes what task.

Arithmetic Operators

Operator	What It Does
+	Addition
-	Subtraction
*	Multiplication
/	Division
%	Modulo

Relational and Equality Operators

Operator	What It Does
==	Equal to
!=	Not equal to
>	Greater than
<	Less than
>=	Greater than or equal to
<=	Less than or equal to

Logical Operators

Operator	What It Does
!	NOT
&&	Logical AND
||	Logical OR

Compound Assignment Operators

Operator	What It Does
+=	Addition
-=	Subtraction
*=	Multiplication
\/=	Division
\%=	Modulo
&=	Bitwise AND
|=	Bitwise Inclusive OR
^=	Exclusive OR
<<=	Shift Left
>>=	Shift Right

Increment and Decrement Operators

Operator	What It Does
++	Addition
--	Subtraction
*=	Multiplication
/=	Division
%=	Modulo
&=	Bitwise AND
|=	Bitwise Inclusive OR
^=	Exclusive OR
<<=	Shift Left
>>=	Shift Right

Bitwise Operators

Operator	What It Does
&	Bitwise AND
|	Bitwise Inclusive OR
^	Exclusive OR
~	Unary complement (bit inversion)
<<	Shift Left
>>	Shift Right

Other operators

Operator	What It Does
()	Cast
,	Comma
Sizeof()	Size of
? :	Conditional
&	Address
*	Indirection

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Source:http://www.dummies.com/how-to/content/objectivec-operators.html