你能用c语言写出以下要求的代码吗 系统分为服务端和客户端两个程序，服务端和客户端可在局域网内网络通信；  服务端负责报名数据维护管理（数据保存在服务端），报名数据具体包含的内容自行设计确定；  客户端负责与用户交互、向服务端提交用户的操作（输入）、接收服务端发来的数据并呈现（显示）给用户。  用户通过客户端输入报名具体信息并提交给服务端。服务端收到报名信息并核查无误（比如报名信息不可与已有报名信息重复）后，向客户端发回一个唯一的（不重复的）“报名号”即确认报名成功；  用户可通过客户端向服务端发送请求，要求服务端查找并发回自己的报名信息供查看；  服务端程序退出之前自动将当前报名数据导出成文本文件保存于.exe程序所在目录下；  报名数据存储采用链表或数组均可，建议用链表。

以下是一个基于C语言的简单实现，包括服务端和客户端两个程序。

服务端程序：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>

#define MAX_NAME_LEN 50
#define MAX_ID_LEN 10
#define MAX_DATA_LEN 1000

typedef struct student {
    char name[MAX_NAME_LEN];
    char id[MAX_ID_LEN];
    struct student *next;
} Student;

Student *head = NULL;
int num_of_students = 0;

int add_student(char *name, char *id) {
    Student *ptr = head;
    while (ptr != NULL) {
        if (strcmp(ptr->id, id) == 0) {
            return -1;  // ID already exists
        }
        ptr = ptr->next;
    }
    Student *new_student = (Student *) malloc(sizeof(Student));
    strcpy(new_student->name, name);
    strcpy(new_student->id, id);
    new_student->next = NULL;
    if (head == NULL) {
        head = new_student;
    } else {
        ptr = head;
        while (ptr->next != NULL) {
            ptr = ptr->next;
        }
        ptr->next = new_student;
    }
    num_of_students++;
    return num_of_students;
}

char *get_student_info(char *id) {
    Student *ptr = head;
    while (ptr != NULL) {
        if (strcmp(ptr->id, id) == 0) {
            char *info = (char *) malloc(MAX_DATA_LEN);
            sprintf(info, "Name: %s\nID: %s\n", ptr->name, ptr->id);
            return info;
        }
        ptr = ptr->next;
    }
    return NULL;  // ID not found
}

void save_data() {
    FILE *fp = fopen("data.txt", "w");
    if (fp == NULL) {
        printf("Failed to save data.\n");
        return;
    }
    Student *ptr = head;
    while (ptr != NULL) {
        fprintf(fp, "%s,%s\n", ptr->name, ptr->id);
        ptr = ptr->next;
    }
    fclose(fp);
}

int main() {
    int server_fd, new_socket, val_read;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[MAX_DATA_LEN] = {0};
    char response[MAX_DATA_LEN] = {0};

    // Create server socket
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("Socket creation failed.");
        exit(EXIT_FAILURE);
    }

    // Set socket options
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt))) {
        perror("Setsockopt failed.");
        exit(EXIT_FAILURE);
    }

    // Bind socket to address and port
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(8080);
    if (bind(server_fd, (struct sockaddr *) &address, sizeof(address)) < 0) {
        perror("Bind failed.");
        exit(EXIT_FAILURE);
    }

    // Start listening for incoming connections
    if (listen(server_fd, 3) < 0) {
        perror("Listen failed.");
        exit(EXIT_FAILURE);
    }

    while (1) {
        printf("Waiting for connection...\n");

        // Accept incoming connection
        if ((new_socket = accept(server_fd, (struct sockaddr *) &address, (socklen_t *) &addrlen)) < 0) {
            perror("Accept failed.");
            exit(EXIT_FAILURE);
        }
        printf("Connection accepted.\n");

        // Receive data from client
        val_read = read(new_socket, buffer, MAX_DATA_LEN);
        if (val_read < 0) {
            perror("Read failed.");
            exit(EXIT_FAILURE);
        }
        printf("Received data: %s\n", buffer);

        // Parse client request and respond accordingly
        char *token = strtok(buffer, ",");
        if (strcmp(token, "add") == 0) {
            char *name = strtok(NULL, ",");
            char *id = strtok(NULL, ",");
            int result = add_student(name, id);
            if (result == -1) {
                strcpy(response, "Error: ID already exists.");
            } else {
                sprintf(response, "Success: Your unique ID is %d.", result);
            }
        } else if (strcmp(token, "get") == 0) {
            char *id = strtok(NULL, ",");
            char *info = get_student_info(id);
            if (info == NULL) {
                strcpy(response, "Error: ID not found.");
            } else {
                strcpy(response, info);
                free(info);
            }
        } else {
            strcpy(response, "Error: Invalid request.");
        }

        // Send response to client
        send(new_socket, response, strlen(response), 0);
        printf("Response sent: %s\n", response);

        close(new_socket);
    }

    save_data();
    return 0;
}

客户端程序：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>

#define MAX_DATA_LEN 1000

int main() {
    int sock = 0, valread;
    struct sockaddr_in serv_addr;
    char buffer[MAX_DATA_LEN] = {0};
    char request[MAX_DATA_LEN] = {0};

    // Create socket
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        printf("\nSocket creation error.\n");
        return -1;
    }

    // Set server address and port
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(8080);
    if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
        printf("\nInvalid address / address not supported.\n");
        return -1;
    }

    // Connect to server
    if (connect(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0) {
        printf("\nConnection failed.\n");
        return -1;
    }

    // Send request to server and receive response
    printf("Enter command: ");
    fgets(request, MAX_DATA_LEN, stdin);
    send(sock, request, strlen(request), 0);
    valread = read(sock, buffer, MAX_DATA_LEN);
    printf("%s\n", buffer);

    return 0;
}

注意：以上代码仅为简单实现，还有很多细节需要考虑和完善。