无聊拿socket写的100以内的加法考试。。。

用的广播IP，所以校内网不用设置，直接在校内网随便找台电脑打开服务端，然后再随便找台电脑打开客户端，然后就可以做100以内的加法了。。。

说明：客户端输入“ready”，服务端会随机发送一条加法算式，客户端发送结果，如果回答正确就显示“Right！”，然后可以输入“ready”做下一道题，否则显示“Wrong！”，需重新输入结果，直到做对为止。。。

还想加点UI，看来要学习多线程了。。。

就是这么蛋疼。。。

客户端

#include<stdio.h>
#include<winsock.h>
#pragma comment (lib,"ws2_32.lib")

int main()
{
    char buffer[];
    WSADATA data;
    WSAStartup(MAKEWORD(,), &data);
    SOCKET mySocket;
    struct sockaddr_in server;
    server.sin_family = AF_INET;
    server.sin_port = htons();
    server.sin_addr.s_addr = inet_addr("10.7.4.255");
    mySocket = socket(AF_INET, SOCK_DGRAM, );
    int len = sizeof(server);
    while(scanf("%s", buffer) != EOF)
    {
        sendto(mySocket, buffer, sizeof(buffer), ,(sockaddr*)&server, len);
        recvfrom(mySocket, buffer, sizeof(buffer), , (sockaddr *)&server, &len);
        printf("%s\n", buffer);
    }
    closesocket(mySocket);
    WSACleanup();
    return ;
}

服务端

#include <stdio.h>
#include <winsock.h>
#include <string.h>
#include <time.h>
#pragma comment (lib,"ws2_32.lib")

int main()
{
    WSADATA data;
    WSAStartup(MAKEWORD(, ), &data);
    SOCKET mySocket;
    sockaddr_in from;
    sockaddr_in local;
    local.sin_family = AF_INET;
    local.sin_addr.s_addr = INADDR_ANY;
    local.sin_port = htons();
    mySocket = socket(AF_INET, SOCK_DGRAM, );
    bind(mySocket, (sockaddr *)&local, sizeof(local));
    char right[] = "Right!";
    char wrong[] = "Wrong!";
    char inputError[] = "Input Error!";
    char answer[];
    char buffer[];
    srand(time(NULL));
    int len = sizeof(from);
    while()
    {
        recvfrom(mySocket, buffer, sizeof(buffer), , (sockaddr *)&from, &len);
        if(strcmp(buffer, "ready") == )
        {
            int x = rand() % ;
            int y = rand() % ;
            int z = x + y;
            sprintf(answer, "%d", z);
            sprintf(buffer, "%d + %d = ?", x, y);
            sendto(mySocket, buffer, sizeof(buffer), , (sockaddr *)&from, len);
            int ok = ;
            while(!ok)
            {
                recvfrom(mySocket, buffer, sizeof(buffer), , (sockaddr *)&from, &len);
                if(strcmp(buffer, answer) == )
                {
                    ok = ;
                    sendto(mySocket, right, sizeof(right), , (sockaddr *)&from, len);
                }
                else
                    sendto(mySocket, wrong, sizeof(wrong), , (sockaddr *)&from, len);
            }
        }
        else sendto(mySocket, inputError, sizeof(inputError), , (sockaddr *)&from, len);
    }
    closesocket(mySocket);
    WSACleanup();
    return ;
}