计算机网络（猜数字）.

#include "stdlib.h" #include "winsock.h" #include<string.h> #include<stdlib.h> #include<time.h> #include "stdio.h" #pragma comment(lib,"WS2_32") void main() { WSADATA wsaData; SOCKET sock, newsock; struct sockaddr_in server; struct sockaddr_in tcpaddr; int num,port,p; char ip[1024]; char buf[1024],c[1024]; int rval, len; int errno; long int data; puts(" →§欢迎进入网络猜数字游戏§← "); puts(" ☆钟雷 制作☆"); puts(" ★服务器端★"); puts("\n◎请输入端口地址："); scanf("%d",&p); puts("◎请输入本机ip地址："); while(1) { gets(ip); if(ip[0]!='\0') { port=p;break;} } errno=WSAStartup(MAKEWORD( 2, 0 ), &wsaData); if (errno!=0) { perror("cannot init"); exit(1); } /* 建立套接字 */ sock = socket(AF_INET, SOCK_STREAM, 0); if (sock == INVALID_SOCKET) { perror("opening stream socket"); WSACleanup(); exit(1); } /* 指定端口和IP */ memset((char*)&server,0,sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_port = htons(port); /* 端口 */ server.sin_addr.S_un.S_addr= inet_addr(ip); /* 本机 */ errno=bind(sock, (struct sockaddr *)&server, sizeof(server)); if (errno != 0) { closesocket(sock); perror("binding stream socket"); printf("%d\n",(errno=WSAGetLastError())); WSACleanup(); exit(1); } /* 开始接收连接 */ begin:srand(time(NULL)); num=rand() % 100 + 1; printf("\n※产生随机答案为：%d\n",num); errno=listen(sock, 5); if (errno!=0) { printf("listen error\n"); closesocket(sock); WSACleanup(); exit(1); } len = sizeof(struct sockaddr); while (1) { newsock = accept(sock, (struct sockaddr *)&tcpaddr, (int *)&len); if (newsock == INVALID_SOCKET) perror("accept"); else { do { memset(buf, 0, sizeof(buf)); rval = recv(newsock, buf,1024,0); if (rval== SOCKET_ERROR) { perror("reading stream message"); closesocket(newsock); closesocket(sock); WSACleanup(); exit(1); } data=atol(buf); while(1) { if(data>num) {strcpy(buf,"大了");break;} else if(data<num) {strcpy(buf,"小了");break;} else {strcpy(buf,"猜对了");break;} } if (rval == 0) printf("ending connection\n"); else { printf("-->%s\n", buf); strcpy(c,buf); send(newsock,buf,1024,0); } if(strcmp(buf,"猜对了")==0) goto begin; } while (rval != 0); closesocket(newsock); } }; closesocket(sock); WSACleanup(); }