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Data Definitions
If typedef is used with any of the basic or special types it creates a
new type name that can be used in declarations. The identifier
does not allocate space but rather may be used as a type specifier
in other data definitions.
typedef
For example:
[type-qualifier] [type-specifier] [declarator];
typedef int mybyte;
// mybyte can be used in
declaration to
// specify the int type
typedef short mybit;
// mybyte can be used in
declaration to
// specify the int type
typedef enum {red, green=2,blue}colors;
//colors can be used to
declare
//variables of this enum type
__ADDRESS__: A predefined symbol __ADDRESS__ may be
used to indicate a type that must hold a program memory
address.
For example:
___ADDRESS__ testa = 0x1000
//will allocate 16 bits for test a and
//initialize to 0x1000
Declarations
A declaration specifies a type qualifier and a type specifier, and is followed by a list
of one or more variables of that type.
For example:
int a,b,c,d;
mybit e,f;
mybyte g[3][2];
char *h;
colors j;
struct data_record data[10];
static int i;
extern long j;
Variables can also be declared along with the definitions of the special types.
For example:
enum colors{red, green=2,blue}i,j,k;
// colors is the enum type and
i,j,k
//are variables of that type
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