ABL electronic PIC Microcontrollers PIC18 User Manual

4. Both of type pointer to qualified or unqualified versions of compatible types. 

The resulting type is a pointer to a type qualified with all the type qualifiers of 
the types pointed to by both operands.

5. One operand is a pointer, and the other is a null pointer constant. The resulting 

type is a pointer to a type qualified with all the type qualifiers of the types 
pointed to by both operands.

6. One operand is a pointer to an object or incomplete type, and the other is a 

pointer to a qualified or unqualified version of 

void

. The resulting type is that 

of the non-pointer-to-

void

operand.

Unlike many other programming languages, C treats value assignment as an oper-
ation (represented by an operator) rather than instruction.

For a common value assignment, we use a simple assignment operator (=) :

expression1 = expression2

Expression1

is an object (memory location) to which we assign value of

expression2

. Operand 

expression1

has to be a lvalue, and 

expression2

can

be any expression. The assignment expression itself is not an lvalue.

If 

expression1

and 

expression2

are of different types, result of the 

expres-

sion2

will be converted to the type of 

expression1

, if necessary. Refer to Type

Conversions for more information.

C allows more comlex assignments by means of compound assignment operators.
Syntax of compound assignment operators is:

expression1 op= expression2

where 

op

can be one of binary operators 

+

, 

-

, 

*

, 

/

, 

%

, 

&

, 

|

, 

^

, 

<<

, or 

>>

.

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