关于VOID的问题 [英] Question on VOID
问题描述
大家好，
我想知道无效吗？
C编程语言属于哪个类别？
有多少位无效？
是否可以定义一个名为
的变量
void a;
感谢大家的评论！
Zeh
Zero写道：
>
大家好，
我想知道无效吗？ br />
C编程语言属于哪个类别？
（void）是一个不完整类型。
有多少比特无效？
是否可以定义一个名为
void a的变量;
No.
-
pete
10月16日上午6:54，Zero< chefmue ... @ web.dewrote：
Hello all，
我想知道无效吗？
C编程语言属于哪个类别？
有多少比特需要无效？
是否可以定义一个名为
的varibale
void a;
谢谢大家的支持评论！
Zeh
零，
1.无效 ;是C中的数据类型。
2." void"通常与处理器的
体系结构的位数相同。
- 因此在8位微虚空中将是8位。您需要在编译器中对此进行验证。
3.您无法将变量定义为void a;但你可以将
指针定义为void * a;。
- Void指针用于将无类型数据传入和传出
函数。
- Void指针也可用于将指针传递给其他
函数（即函数指针）。
这是一个可以进一步解释的链接。
http://tigcc.ticalc.org/doc/keywords.html#void
希望这会有所帮助，
Keith
http://www.doubleblackdesign.com
husterk写道：
....
2."空隙"通常与处理器的
体系结构的位数相同。
- 因此在8位微虚空中将是8位。您需要在编译器中对此进行验证。
" void"是一种无法完成的不完整类型;它没有
大小。
你可能会想到一些编译器鼓励人们的事实
到通过允许对void *
指针进行指针运算来编写有缺陷的代码，在这种情况下，它被视为与char *基本相同。
因此，有效的位大小为CHAR_BITS 。但是，如果你要引用那个功能，你应该警告它是
特定于实现。
Hello all,
I wonder about void?
To which category in the C programming language does it belong?
Of how many bits consits void?
Is it possible to define a varibale called
void a;
Thank you all for your comments!
Zeh
Zero wrote:>
Hello all,
I wonder about void?
To which category in the C programming language does it belong?(void) is an "incomplete type".
Of how many bits consits void?
Is it possible to define a varibale called
void a;No.
--
pete
On Oct 16, 6:54 am, Zero <chefmue...@web.dewrote:Hello all,
I wonder about void?
To which category in the C programming language does it belong?
Of how many bits consits void?
Is it possible to define a varibale called
void a;
Thank you all for your comments!
ZehZero,
1. "void" is a datatype in C.
2. "void" is typically the same number of bits as your processor''s
architecture.
- So in an 8-bit micro void would be 8-bits. You will need to
verify this in your compiler though.
3. You cannot define a variable as "void a;" but you can define a
pointer as "void *a;".
- Void pointers are used to pass typeless data into and out of
functions.
- Void pointers can also be use to pass pointers to other
functions (i.e. function pointers).
Here is a link that explains this further.
http://tigcc.ticalc.org/doc/keywords.html#void
Hope this helps,
Keith
http://www.doubleblackdesign.com
husterk wrote:
....2. "void" is typically the same number of bits as your processor''s
architecture.
- So in an 8-bit micro void would be 8-bits. You will need to
verify this in your compiler though."void" is an incomplete type that cannot be completed; it doesn''t have a
size.
You may be thinking about the fact that some compilers encourage people
to write defective code by allowing pointer arithmetic on void*
pointers, in which context it is treated essentially the same as char*.
Thus, the effective size in bits is CHAR_BITS. However, if you''re going
to refer to that "feature", you should warn that it is
implementation-specific.
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