ABL electronic PIC Microcontrollers PIC16 - Manual (Page 126)

Upon finding a match, program flow continues normally: following instructions
will be executed in natural order regardless of the possible case label. If no
case
satisfies the condition, the
default
case evaluates (if the label
default
is speci-
fied).
For example, if variable
i
has value between 1 and 3, following
switch
would
always return it as 4:
switch (i) {
case 1: i++;
case 2: i++;
case 3: i++;
}
To avoid evaluating any other
cases
and relinquish control from the
switch
, ter-
minate each case with
break
.
Conditional
switch
statements can be nested – labels
case
and
default
are
then assigned to the innermost enclosing
switch
statement.
Here is a simple example with
switch
. Let’s assume we have a variable with only
3 different states (0, 1, or 2) and a corresponding function (event) for each of these
states. This is how we could switch the code to the appopriate routine:
switch (state) {
case 0: Lo(); break;
case 1: Mid(); break;
case 2: Hi(); break;
default : Message("Invalid state!");
}
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