1、把字符串转化成整形，不能用系统函数。 2、SQL 题(略) 3、24个人，要求5个人一排，排6排如何排？ 4、8个人跑步比赛结果，给出系列条件：那个排名在那个前面、有一个第4名…… ，让你推测出实际的名次。(略) 5、两根蜡烛，每根单独燃烧一个小时燃尽。如何通过两根蜡烛的燃烧判断45 分钟？

(一)设计一个Windows下的C语言的，基于TCP的多线程服务器和客户端发送程序。1，对服务器程序，服务器收到客户端发出的字符串后用printf()语句显示出来，要求对客户端报文的处理采用多线程并发处理方式；2，对于客户端程序，客户端收到来自键盘输入的字符，然后发给指定IP的服务器上。答案：//==========================================================================//Server//==========================================================================#include #include #define BUFFER_SIZE牋?500#define MAX_CONNECTION_COUNTFD_SETSIZEint do_something_with(SOCKET NewConnection);void main(int argc, char *argv[]){WSADATA牋牋? 牋牋牋牋 wsaData;SOCKET牋牋牋牋牋牋牋 ListeningSocket;SOCKET牋牋牋牋牋牋牋 NewConnection[MAX_CONNECTION_COUNT];SOCKADDR_IN牋牋牋牋?ServerAddr;SOCKADDR_IN牋牋牋牋?ClientAddr;int牋牋牋牋牋牋牋牋?ClientAddrLen;u_short牋牋牋牋牋牋?Port = 5150;int牋? 牋牋牋牋牋牋牋 Ret;fd_set fdread;int i;// Initialize Winsock version 2.2if ((Ret = WSAStartup(MAKEWORD(2,2), &wsaData)) != 0){// NOTE: Since Winsock failed to load we cannot use WSAGetLastError // to determine the error code as is normally done wh en a Winsock // API fails. We have to report the return status of the function.printf("WSAStartup failed with error %d\n", Ret);return;}牋 /* Initialize the connection array */for( i = 0;i < MAX_CONNECTION_COUNT; i++)NewConnection[i] = -1;// Cre ate a new socket to listening for client connections.if ((ListeningSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET){sockerror("Create socket failed! ");WSACleanup();return;} // Setup a SOCKADDR_IN structure that will tell bind that we// want to listen for connections on all interfaces using port// 5150. Notice how we convert the Port variable from host byte// order to network byte order.ServerAddr.sin_family = AF_INET;ServerAddr.sin_port = htons(Port);牋?ServerAddr.sin _addr.s_addr = htonl(INADDR_ANY);// Associate the add