关于 memcpy(),memcmp()解决方法

关于 memcpy(),memcmp()
我看了一下资料，说是用到memcpy(),memcmp(),需要头文件<string.h>，但是我写了代码测试下，发现不需要头文件<string.h>也是可以的，这是为什么呢？

------解决方案--------------------
memcpy
Copies characters between buffers.

void *memcpy( void *dest, const void *src, size_t count );

Routine Required Header Compatibility 
memcpy <memory.h> or <string.h> ANSI, Win 95, Win NT 


For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB Single thread static library, retail version 
LIBCMT.LIB Multithread static library, retail version 
MSVCRT.LIB Import library for MSVCRT.DLL, retail version 


这是传世的最完整帮助文档。

估计是你别的头文件里面已经包含了
------解决方案--------------------
memcpy
Copies characters between buffers.

void *memcpy( void *dest, const void *src, size_t count );

Routine Required Header Compatibility 
memcpy <memory.h> or <string.h> ANSI, Win 95, Win NT 


For additional compatibility information, see Compatibility in the Introduction.

Libraries

LIBC.LIB Single thread static library, retail version 
LIBCMT.LIB Multithread static library, retail version 
MSVCRT.LIB Import library for MSVCRT.DLL, retail version 

可能别的头文件里面包含了