对memcpy（）和memset（）的疑问 [英] Doubt in memcpy() and memset()
问题描述
我想知道一些情况，何时使用memcpy（）和什么时候
到memset（）;
提前付款..
Hi,
I want to know some of the situations , when to use memcpy() and when
to memset();
Thanx in Advance..
推荐答案
Shhnwz.a写道：
Shhnwz.a wrote:
我想知道一些情况，何时使用memcpy（）和什么时候
来memset（）;
Thanx in Advance ..
Hi,
I want to know some of the situations , when to use memcpy() and when
to memset();
Thanx in Advance..
NAME
memcpy - copy memory区域
名称
memset - 用一个恒定字节填充内存
家庭作业！
[提示：手册很有趣]
Tom
NAME
memcpy - copy memory area
NAME
memset - fill memory with a constant byte
HOMEWORKALITY!
[hint: man pages are fun]
Tom
Shhnwz.a写道：
Shhnwz.a wrote:
我想知道一些情况，何时使用memcpy（）和什么时候
到memset（）;
I want to know some of the situations , when to use memcpy() and when
to memset();
你能说出他们的描述吗？
memcpy（void * s1，const void * s2，size_t n）;
...将s2
指向的对象中的n个字符复制到s1指向的对象中。如果在重叠的对象之间发生复制
，则行为未定义。
memset（void * s，int c，size_t n）;
...将c的值（转换为无符号字符）
复制到指向的对象的前n个字符中
to by s。
使用适合您情况的任何一种。
-
Chris" Perikles凯" Dollin
这里没有人正是他出现的。 G''kar，/ Babylon 5 /
Can''t you tell from their descriptions?
memcpy( void *s1, const void *s2, size_t n );
... copies n characters from the object pointed to by s2
into the object pointed to by s1. If copying takes place
between objects that overlap, the behaviour is undefined.
memset( void *s, int c, size_t n );
... copies the value of c (converted to an unsigned char)
into each of the first n characters of the object pointed
to by s.
Use whichever one fits your situation.
--
Chris "Perikles triumphant" Dollin
"No-one here is exactly what he appears." G''kar, /Babylon 5/
Chris Dollin写道：
Chris Dollin wrote:
>
memset（void * s，int c，size_t n）;
...复制c的值（转换为unsigned char）
到对象的前n个字符中每个字符
到s。
>
memset( void *s, int c, size_t n );
... copies the value of c (converted to an unsigned char)
into each of the first n characters of the object pointed
to by s.
顺便说一句，我我对第二个参数的类型感到困惑。
为什么不使用（unsigned char）类型？
memset（void * s，unsigned char c，size_t n） ;
谢谢。
By the way, I''m puzzled about the type of the second parameter.
Why not use (unsigned char) type?
memset(void *s, unsigned char c, size_t n);
Thanks.
这篇关于对memcpy（）和memset（）的疑问的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
