Abl-electronic PIC Microcontrollers PIC16 Manual do Utilizador descarregar pdf (Página 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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