#include
#include
#include
#include
#include
#include
#include

#define?PORT?1111
#define?MAXDATASIZE?100

int?main?（int?argc?char?*argv[]）?{
	int?fd?numbytes;
	char?buf[MAXDATASIZE];

	struct?hostent?*he;
	struct?sockaddr_in?server?reply;

	if?（argc?!=?2）?{
		printf（“Usage:?%s\n“?argv[0]）;
		exit（1）;
	}
	if?（?（he?=?gethostbyname（argv[1]））?==?NULL）?{
		printf（“gethostbyname?error!“）;
		exit（1）;
	}
	if?（?（fd?=?socket（AF_INET?SOCK_DGRAM?0））?==?-1）?{
		printf（“socket（）?error\n“）;
		exit（1）;
	}
	bzero（&server?sizeof（server））;
	server.sin_family?=?AF_INET;
	server.sin_port?=?htons（PORT）;
	server.sin_addr?=?*（（struct?in_addr?*）he->h_addr）;
	int?len;
	char?a[2];
	for?（int?i?=?1;?i?<=?100;?i++）?{
		sprintf（a?“%d“?i）;
		sendto（fd?a?2?0?（struct?sockaddr?*）&server?sizeof（struct?sockaddr））;
		if?（?（numbytes?=?recvfrom（fd?buf?MAXDATASIZE?0?（struct?sockaddr?*）&server?&len））?==?-1）?{
			printf（“recvfrom（）?error\n“）;
			exit（1）;
		}
		buf[numbytes]?=?‘\0‘;
		printf（“%s\n“?buf）;
	}
	close（fd）;
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-12-09?09:22??UDP\
?????文件???????12880??2018-12-07?09:22??UDP\Client
?????文件???????13000??2018-12-07?09:22??UDP\Server
?????文件????????1106??2018-12-07?09:21??UDP\udpClient.c
?????文件????????1124??2018-12-07?09:22??UDP\udpServer.c