C语言中memcopy函数功能及用法

函数名: memcpy
功  能: 从源source中拷贝n个字节到目标destin中
用  法: void *memcpy(void *destin, void *source, unsigned n);
程序例:

#include <stdio.h>
#include <string.h>
int main(void)
{
   char src[] = "******************************";
   char dest[] = "abcdefghijlkmnopqrstuvwxyz0123456709";
   char *ptr;
   printf("destination before memcpy: %s/n", dest);
   ptr = memcpy(dest, src, strlen(src));    /*****目标destin,源source,拷贝长度*****/
   if (ptr)                                                   /******ptr=1*****/
      printf("destination after memcpy:  %s/n", dest);
   else
      printf("memcpy failed/n");
   return 0;
}