ABL electronic PIC Microcontrollers PIC16 - Manual (Page 123)

Statements specify the flow of control as a program executes. In the absence of
specific jump and selection statements, statements are executed sequentially in the
order of appearance in the source code.
Statements can be roughly divided into:
- Labeled Statements
- Expression Statements
- Selection Statements
- Iteration Statements (Loops)
- Jump Statements
- Compound Statements (Blocks)
Labeled Statements
Every statement in program can be labeled. Label is an identifier added before the
statement like this:
label_identifier : statement ;
There is no special declaration of a label – it just “tags” the statement.
Label_identifier
has a function scope and label cannot be redefined within
the same function.
Labels have their own namespace: label identifier can match any other identifier in
the program.
A statement can be labeled for two reasons:
1. The label identifier serves as a target for the unconditional goto statement,
2. The label identifier serves as a target for the
switch
statement. For this
purpose, only
case
and
default
labeled statements are used:
case constant-expression : statement
default : statement
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STATEMENTS