【请教】用memmove函数如何实现交换数组中的元素呢？

[wangfan88]

【请教】用memmove函数如何实现交换数组中的元素呢？关于memmove的参数使用，一直不太明白，谢谢大家了o(∩_∩)o...
memmove(a+i,&x+1,1)。。这样恐怕不行吧。。。该怎样呢。。。希望高人指点！

[ryfdizuo]

Parameters
destination 
Pointer to the destination array where the content is to be copied, 
   type-casted to a pointer of type void*. 
source 
Pointer to the source of data to be copied, type-casted to a pointer of type const void*. 
num 
Number of bytes to copy. 

Return Value
destination is returned.

Example
/* memmove example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char str[] = "memmove can be very useful......";
  memmove (str+20,str+15,11);
  puts (str);
  return 0;
}
Output:
memmove can be very very useful. 

[ryfdizuo]

函数:void * memmove ( void * destination, const void * source, size_t num );