Operators

Arithmetic

Binary operators
+     Addition
-     Subtraction
*     Multiplication
/     Division (division of 2 integers returns an integer value) 
%     Modulus (returns the integer remainder) (both operands must be integers)
Unary operators
-     Unary negation (reverses the sign)
++    Increment (can be prefix or postfix) 
--    Decrement (can be prefix or postfix)

Assignment

=     Assign

+=    Add and assign 
-=    Subtract and assign
*=    Multiply and assign 
/ =   Divide and assign
%=    Modulus and assign

&=    Bitwise AND and assign
|=    Bitwise OR and assign
^=    Bitwise XOR and assign

<<=   Left shift (zero fill) and assign
>>=   Right shift (zero fill or sign-propogating, depending on the machine) and assign

Comparison

==  : Equal 
!=  : Not equal 
>  : Greater than 
>=  : Greather than or equal to 
<  : Less than 
<=  : Less than or equal to

Conditional

? :   Ternary comparison operator

      condition ? val1 : val2  (Evaluates val1 if condition is true; otherwise, evaluates val2)

Boolean

  • Short-circuit logical operations
  • Evaluates the minimal number of expressions necessary
  • Partial evaluation (rather than full evaluation) 
&&    and
||    or
!     not (logical negation)
  • Logical operators are typically used with Boolean (logical) values; when they are, they return a Boolean value; however, the && and || operators actually return the value of one of the specified operands, so if these operators are used with non-Boolean values, they may return a non-Boolean value.

Bitwise

Binary operators
&     And
|     Or
^     Xor

<<    Shift left (zero fill) 
>>    Shift right (zero fill or sign-propogating, depending on the machine)

      Zero fill: Vacated bits are filled with zeros.
      Sign-propogating: Vacated bits are filled with the leftmost bit (sign bit)
Unary operators
~     Not (inverts the bits) (one's complement)

Pointer

Unary operators
&     Address operator (the address of a value)
*     Indirection operator (dereference operator) (dereferencing a pointer to obtain the value pointed to)
Binary operators
->  : Structure pointer operator (dereferencing a pointer to a structure, to obtain
      the value of one of the structure members)

Examples

int i = 4;
int *ip;
ip = &i;     // Obtaining the address of i using &
int j = *ip; // Dereferencing ip using *

Misc

sizeof   Size-of operator (the amount of memory allocated for the data type, variable, or value)

         sizeof <unary-expr>
         sizeof (<data-type>)