ABL electronic PIC12 Benutzerhandbuch

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":

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:

*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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