/* File: client.c */	#include <sys/types.h>	#include <sys/socket.h>	#include <netinet/in.h>	int main(int argc, char **argv)	{		int fd;		struct sockaddr_in address;		int address_len;		char line[80] = "Client to Server string!\n";		int n;		//建立套接口		fd = socket(AF_INET, SOCK_DGRAM, 0);		//聯(lián)接		bzero(&address, sizeof(address));		address.sin_family = AF_INET;		address.sin_addr.s_addr = inet_addr("127.0.0.1");		address.sin_port = htons(1234);		address_len = sizeof(address);		//發(fā)送數(shù)據(jù)		sendto(fd, line, strlen(line)+1, 0, 			(struct sockaddr *)&address, sizeof(address)); 		//接收數(shù)據(jù)		n = recvfrom(fd, line, 80, 0, NULL, NULL);		printf("received %d:%s", n, line);	}