Objective-c类型大小(值域)

This is a good overview:http://reference.jumpingmonkey.org/programming_languages/objective-c/types.html

or run this code

NSLog(
@"Primitive sizes:"
)
;
NSLog(
@"The size of a char is: %d."
, sizeof(
char
)
)
;
NSLog(
@"The size of short is: %d."
, sizeof(
short
)
)
;
NSLog(
@"The size of int is: %d."
, sizeof(
int
)
)
;
NSLog(
@"The size of long is: %d."
, sizeof(
long
)
)
;
NSLog(
@"The size of long long is: %d."
, sizeof(
long
 long
)
)
;
NSLog(
@"The size of a unsigned char is: %d."
, sizeof(
unsigned char
)
)
;
NSLog(
@"The size of unsigned short is: %d."
, sizeof(
unsigned short
)
)
;
NSLog(
@"The size of unsigned int is: %d."
, sizeof(
unsigned int
)
)
;
NSLog(
@"The size of unsigned long is: %d."
, sizeof(
unsigned long
)
)
;
NSLog(
@"The size of unsigned long long is: %d."
, sizeof(
unsigned long
 long
)
)
;
NSLog(
@"The size of a float is: %d."
, sizeof(
float
)
)
;
NSLog(
@"The size of a double is %d."
, sizeof(
double
)
)
;
 
NSLog(
@"Ranges:"
)
;
NSLog(
@"CHAR_MIN:   %c"
,   CHAR_MIN)
;
NSLog(
@"CHAR_MAX:   %c"
,   CHAR_MAX)
;
NSLog(
@"SHRT_MIN:   %hi"
,  SHRT_MIN)
;    // signed short int

NSLog(
@"SHRT_MAX:   %hi"
,  SHRT_MAX)
;
NSLog(
@"INT_MIN:    %i"
,   INT_MIN)
;
NSLog(
@"INT_MAX:    %i"
,   INT_MAX)
;
NSLog(
@"LONG_MIN:   %li"
,  LONG_MIN)
;    // signed long int

NSLog(
@"LONG_MAX:   %li"
,  LONG_MAX)
;
NSLog(
@"ULONG_MAX:  %lu"
,  ULONG_MAX)
;   // unsigned long int

NSLog(
@"LLONG_MIN:  %lli"
, LLONG_MIN)
;   // signed long long int

NSLog(
@"LLONG_MAX:  %lli"
, LLONG_MAX)
;
NSLog(
@"ULLONG_MAX: %llu"
, ULLONG_MAX)
;  // unsigned long long int

When run on an iPhone 3GS (iPod Touch and older iPhones should yield the same result) you get:

Primitive sizes:

The size of a char
 is: 1
.
The
 size of short
 is: 2
.
The
 size of int
 is: 4
.
The
 size of long
 is: 4
.
The
 size of long
 long
 is: 8
.
The
 size of a unsigned char
 is: 1
.
The
 size of unsigned short
 is: 2
.
The
 size of unsigned int
 is: 4
.
The
 size of unsigned long
 is: 4
.
The
 size of unsigned long
 long
 is: 8
.
The
 size of a float
 is: 4
.
The
 size of a double
 is 8
.
Ranges
:
CHAR_MIN:   -128

CHAR_MAX:   127

SHRT_MIN:   -32768

SHRT_MAX:   32767

INT_MIN:    -2147483648

INT_MAX:    2147483647

LONG_MIN:   -2147483648

LONG_MAX:   2147483647

ULONG_MAX:  4294967295

LLONG_MIN:  -9223372036854775808

LLONG_MAX:  9223372036854775807

ULLONG_MAX: 18446744073709551615