ABL electronic PIC Microcontrollers PIC16 - Manual (Page 125)

Nested if statements
Nested
if
statements require additional attention. General rule is that the nested
conditionals are parsed starting from the innermost conditional, with each
else
bound to the nearest available
if
on its left:
if ( expression1 ) statement1
else if ( expression2 )
if ( expression3 ) statement2
else statement3 /* this belongs to: if (expression3) */
else statement4 /* this belongs to: if (expression2) */
Note: The
#if
and
#else
preprocessor statements (directives) look similar to the
if
and
else
statements, but have very different effects. They control which
source file lines are compiled and which are ignored. See Preprocessor for more
information.
Switch Statement
Use the switch statement to pass control to a specific program branch, based on a
certain condition. Syntax of switch statement is:
switch ( expression ) {
case constant-expression_1 : statement_1 ;
.
.
.
case constant-expression_n : statement_n ;
[default : statement ;]
}
First, the
expression
(condition) is evaluated. The
switch
statement then
compares it to all the available
constant-expressions
following the keyword
case
. If the match is found,
switch
passes control to that matching
case
, at
which point the
statement
following the match evaluates. Note that
constant-expressions
must evaluate to integer. There cannot be two same
constant-expressions
evaluating to same value.
Parantheses around
expression
are mandatory.
.
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