函数名: memmove 
 功  能: 移动一块字节 
 用  法: #include <stdio.h> 
         void *memmove(void *destin, void *source, unsigned n); 
 程序例: 
#include <string.h> 
 #include <stdio.h> 
int main(void) 
 { 
   char *dest = "abcdefghijklmnopqrstuvwxyz0123456789"; 
   char *src = "******************************"; 
   printf("destination prior to memmove: %s\n", dest); 
   memmove(dest, src, 26); 
   printf("destination after memmove:    %s\n", dest); 
   return 0; 
 }