关于指针类型的简单问题 [英] Simple question about pointer types
问题描述
您好，
所有指针类型的长度是否相同？我的直觉告诉我是的，
但我只是想和专家确认一下。所以如果我有
typedef struct {
char * field1;
int field2;
} myStruct;
myStruct * a;
char * b;
int * c;
变量a，b和c是变量a，b和c。所有32位长度？谢谢， -
Dave
Hello,
Are all pointer types the same length? My instinct tells me yes,
but I just wanted to confirm with the experts. So if I have
typedef struct {
char* field1;
int field2;
} myStruct;
myStruct *a;
char *b;
int *c;
Are the variables "a", "b", and "c" all 32 bits in length? Thanks, -
Dave
推荐答案
la *********** @ zipmail.com 写道：
你好，
都是指针类型长度相同？我的直觉告诉我是的，
但我只是想与专家确认一下。所以如果我有
typedef struct {
char * field1;
int field2;
} myStruct;
myStruct * a; < br *> char * b;
int * c;
变量是a，b和c。所有32位长度？谢谢， -
是
你可以用sizeof（char *）来检查这个。
问候，
Daniel
Dave
Hello,
Are all pointer types the same length? My instinct tells me yes,
but I just wanted to confirm with the experts. So if I have
typedef struct {
char* field1;
int field2;
} myStruct;
myStruct *a;
char *b;
int *c;
Are the variables "a", "b", and "c" all 32 bits in length? Thanks, -
yes
you can check this with sizeof( char* ) and so on.
Regards,
Daniel
Dave
la *********** @ zipmail.com 写道：
你好，
所有指针类型都是相同的长度？
ITYM尺寸
我的直觉告诉我是的，
但我只想与专家确认。所以，如果我有
[snip]
myStruct * a;
char * b;
int * c;
变量a，b和c是变量a，b和c。所有32位长度？谢谢， -
Hello,
Are all pointer types the same length?
ITYM "size"
My instinct tells me yes,
but I just wanted to confirm with the experts. So if I have
[snip]
myStruct *a;
char *b;
int *c; Are the variables "a", "b", and "c" all 32 bits in length? Thanks, -
不，两种情况都没有指定大小。
有四组指针是需要具有相同的表示和对齐（因此大小）：指向
1）un / qualified兼容类型; 2）空白和字符类型; 3）
结构类型; 4）联合类型。
所以，举一个例子，理论上
unsigned int * up;
signed int * sp ;
`up''和'sp''可能有不同的尺寸（和其他属性）。
-
Stan Tobias
mailx`echo si***@FamOuS.BedBuG.pAlS.INVA LID | sed s / [[：upper：]] // g`
No, the size is not specified in either case.
There are four groups of pointers that are required to have the
same representation and alignment (hence size, too): pointers to
1) un/qualified compatible types; 2) void and character types; 3)
struct types; 4) union types.
So, for an example, in theory
unsigned int *up;
signed int *sp;
`up'' and `sp'' might have different sizes (and other properties).
--
Stan Tobias
mailx `echo si***@FamOuS.BedBuG.pAlS.INVALID | sed s/[[:upper:]]//g`
Daniel Etzold< de ***** @ gmx.net>写道：
Daniel Etzold <de*****@gmx.net> wrote:
la *********** @ zipmail。 com 写道：
myStruct * a;
char * b;
int * c;
变量a，b和c是变量a，b和c。所有32位长度？谢谢， -
myStruct *a;
char *b;
int *c;
Are the variables "a", "b", and "c" all 32 bits in length? Thanks, -
yes
yes
天哪，不！看到我的其他回复。
-
Stan Tobias
mailx`echo si *** @FamOuS.BedBuG.pAlS.INVA LID | sed s / [[：upper：]] // g`
Goodness, NO! See my other reply.
--
Stan Tobias
mailx `echo si***@FamOuS.BedBuG.pAlS.INVALID | sed s/[[:upper:]]//g`
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