帮我写一个c语言航空订票查询系统代码

好的，下面是一个简单的航空订票查询系统的C语言代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include <json-c/json.h>

#define API_URL "https://api.airline.com/flights?from=%s&to=%s&date=%s"
#define MAX_FLIGHTS 100

struct Flight {
    char flight_number[10];
    char from[10];
    char to[10];
    char departure_time[20];
    char arrival_time[20];
    float price;
};

struct MemoryStruct {
    char *memory;
    size_t size;
};

static size_t WriteMemoryCallback(void *contents, size_t size, size_t nmemb, void *userp) {
    size_t realsize = size * nmemb;
    struct MemoryStruct *mem = (struct MemoryStruct *)userp;
    mem->memory = realloc(mem->memory, mem->size + realsize + 1);
    if (mem->memory == NULL) {
        printf("Not enough memory!\n");
        return 0;
    }
    memcpy(&(mem->memory[mem->size]), contents, realsize);
    mem->size += realsize;
    mem->memory[mem->size] = 0;
    return realsize;
}

int main() {
    CURL *curl_handle;
    CURLcode res;
    struct MemoryStruct chunk;

    char from[10], to[10], date[11];
    struct Flight flights[MAX_FLIGHTS];
    int num_flights = 0;

    printf("Welcome to the Airline Booking System!\n");
    printf("Please enter your travel details:\n");
    printf("From: ");
    scanf("%s", from);
    printf("To: ");
    scanf("%s", to);
    printf("Date (YYYY-MM-DD): ");
    scanf("%s", date);

    curl_global_init(CURL_GLOBAL_ALL);
    curl_handle = curl_easy_init();
    if (curl_handle) {
        char url[100];
        snprintf(url, sizeof(url), API_URL, from, to, date);
        curl_easy_setopt(curl_handle, CURLOPT_URL, url);
        curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
        chunk.memory = malloc(1);
        chunk.size = 0;
        curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);
        res = curl_easy_perform(curl_handle);
        if (res != CURLE_OK) {
            printf("Error: %s\n", curl_easy_strerror(res));
        } else {
            json_object *root = json_tokener_parse(chunk.memory);
            json_object *flights_array;
            if (json_object_object_get_ex(root, "flights", &flights_array)) {
                int num_json_flights = json_object_array_length(flights_array);
                for (int i = 0; i < num_json_flights && num_flights < MAX_FLIGHTS; i++) {
                    json_object *json_flight = json_object_array_get_idx(flights_array, i);
                    json_object *json_flight_number, *json_from, *json_to, *json_departure_time, *json_arrival_time, *json_price;
                    struct Flight *flight = &flights[num_flights];
                    if (json_object_object_get_ex(json_flight, "flight_number", &json_flight_number)) {
                        strncpy(flight->flight_number, json_object_get_string(json_flight_number), sizeof(flight->flight_number));
                    }
                    if (json_object_object_get_ex(json_flight, "from", &json_from)) {
                        strncpy(flight->from, json_object_get_string(json_from), sizeof(flight->from));
                    }
                    if (json_object_object_get_ex(json_flight, "to", &json_to)) {
                        strncpy(flight->to, json_object_get_string(json_to), sizeof(flight->to));
                    }
                    if (json_object_object_get_ex(json_flight, "departure_time", &json_departure_time)) {
                        strncpy(flight->departure_time, json_object_get_string(json_departure_time), sizeof(flight->departure_time));
                    }
                    if (json_object_object_get_ex(json_flight, "arrival_time", &json_arrival_time)) {
                        strncpy(flight->arrival_time, json_object_get_string(json_arrival_time), sizeof(flight->arrival_time));
                    }
                    if (json_object_object_get_ex(json_flight, "price", &json_price)) {
                        flight->price = json_object_get_double(json_price);
                    }
                    num_flights++;
                }
            }
            json_object_put(root);
        }
        curl_easy_cleanup(curl_handle);
        free(chunk.memory);
    }
    curl_global_cleanup();

    printf("\n");
    printf("Found %d flights:\n", num_flights);
    printf("Flight No. From    To      Departure Time   Arrival Time     Price\n");
    printf("------------------------------------------------------------------\n");
    for (int i = 0; i < num_flights; i++) {
        struct Flight *flight = &flights[i];
        printf("%-10s %-7s %-7s %-16s %-16s $%.2f\n", flight->flight_number, flight->from, flight->to, flight->departure_time, flight->arrival_time, flight->price);
    }

    return 0;
}

在此代码中，我们使用了libcurl库连接了航空公司提供的API接口，获取了航班信息数据。然后，我们解析API返回的JSON数据，提取与航班查询相关的信息，并将查询结果以表格的形式输出到控制台。在此基础上，您可以进一步完善程序，实现订票、取消订票等功能。