Abl-electronic PIC Microcontrollers PIC16 Manual do Utilizador descarregar pdf (Página 100)

Typedef Specifier

Specifier typedef introduces a synonym for a specified type. You can use type-

def declarations to construct shorter or more meaningful names for types already

defined by the language or for types that you have declared. You cannot use the

typedef specifier inside a function definition.

The specifier

typedef stands first in the declaration:

typedef <type-definition> synonym

;

The typedef keyword assigns the

synonym

to the

<type-definition>

. The

synonym

needs to be a valid identifier.

Declaration starting with the

typedef specifier does not introduce an object or

function of a given type, but rather a new name for a given type. That is, the

typedef declaration is identical to “normal” declaration, but instead of objects, it

declares types. It is a common practice to name custom type identifiers with start-

ing capital letter — this is not required by C.

For example:

// Let's declare a synonym for "unsigned long int":

typedef unsigned long int Distance;

// Now, synonym "Distance" can be used as type identifier:

Distance i;

// declare variable i of unsigned long int

In typedef declaration, as in any declaration, you can declare several types at once.

For example:

typedef int *Pti, Array[10];

Here, Pti is synonym for type “pointer to int”, and Array is synonym for type

“array of 10

int elements”.

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