78IV datasheet(61/523 Pages) NEC

61 / 523 page

CHAPTER 3 DECLARATION OF TYPES AND STORAGE CLASSES

User’s Manual U15556EJ1V0UM

In the following example, “distance” is an int type, the type of “metricp” is a pointer to a function that returns an int

type that has no parameter specification, the type of “z” is a specified structure, and “zp” is a pointer to this structure.

typedef int MILES, KLICKSP ();

typedef struct {long re, im}

complex;

/*...*/

MILES distance;

extern KLICKSP *metricp;

complex z, *zp;

In the following example, the typedef name t is declared with a signed int type, and the typedef name plain is

declared with an int type, and a structure with three bit field members is declared. The bit field members are as

follows.

•

Bit field member with name t and the value 0 to 15

•

Bit field member without a name and the const qualified value –16 to +15 (if accessed)

•

Bit field member with name r and the value –16 to +15

typedef

signed int t;

typedef

int plain;

struct tag {

unsigned t:4;

const

t:5;

plain

r:5;

};

In this example, these two bit field declarations differ in that the first bit field declaration has unsigned as the type

specifier (therefore, t becomes the name of the structure member), and the second bit field declaration, on the other

hand, has const as the type qualifier (qualifies t which can be referred to as the typedef name).

After this

declaration, if:

t f(t (t));

long t;

is found within the effective range, the function f is declared as “function that has one parameter and returns signed

int”, and the parameter is declared as “pointer type for the function that has one parameter and returns signed int”.

The identifier t is declared as long type.

typedef names may be used to facilitate program reading. For example, the following three declarations for the

function signal all specify the same type as the first declaration which does not use typedef.

typedef

void

fv(int) ;

typedef

void

(*pfv) (int) ;

void

(*signal

(int, void (*) (int)))(int);

*signal(int, fv *);

pfv

signal(int, pfv);

78IV Datasheet(PDF) 61 Page - NEC

78IV Datasheet(HTML) 61 Page - NEC

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL