1、 implicit declaration of function `sleep'
#inlude<unistd.h>
2、 implicit declaration of function ‘malloc’
#include<stdlib.h>
3、 implicit declaration of function `memcpy'
#include <string.h>
4、 implicit declaration of function ` inet_addr’
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
5、 suggest parentheses around assignment used as truth value
=改成==
6、 Multiple definition of
将变量声明放到.c