图书馆占座系统带预约时间的c语言

以下是一个简单的图书馆占座系统带预约时间的C语言代码示例：

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define NUM_SEATS 10
#define MAX_NAME_LEN 20

typedef struct {
    char name[MAX_NAME_LEN];
    time_t reserved_time;
} Seat;

Seat seats[NUM_SEATS];

void print_seats() {
    printf("Current seat reservations:\n");
    for (int i = 0; i < NUM_SEATS; i++) {
        if (seats[i].reserved_time == 0) {
            printf("Seat %d: vacant\n", i+1);
        } else {
            printf("Seat %d: reserved by %s until %s", i+1, seats[i].name, ctime(&seats[i].reserved_time));
        }
    }
}

int main() {
    char input[MAX_NAME_LEN];
    int seat_num;

    // initialize seats
    for (int i = 0; i < NUM_SEATS; i++) {
        seats[i].reserved_time = 0;
    }

    // main loop
    while (1) {
        print_seats();

        // get user input
        printf("Enter your name to reserve a seat (or 'quit' to exit): ");
        fgets(input, MAX_NAME_LEN, stdin);
        if (strcmp(input, "quit\n") == 0) {
            break;
        }
        input[strlen(input)-1] = '\0'; // remove newline character

        printf("Enter seat number to reserve (1-%d): ", NUM_SEATS);
        scanf("%d", &seat_num);
        getchar(); // consume newline character

        // check if seat is already reserved
        if (seats[seat_num-1].reserved_time != 0) {
            printf("Sorry, seat %d is already reserved.\n", seat_num);
            continue;
        }

        // reserve the seat
        seats[seat_num-1].reserved_time = time(NULL) + 60*30; // reserve for 30 minutes
        strcpy(seats[seat_num-1].name, input);
        printf("Seat %d reserved by %s.\n", seat_num, input);
    }

    printf("Goodbye!\n");
    return 0;
}

该程序使用了一个简单的结构体来表示座位，其中包含了座位预约者的姓名和预约时间。程序提供了一个 `print_seats()` 函数来打印当前的座位预约情况。在主循环中，程序会要求用户输入姓名和座位号来进行预约。程序会检查该座位是否已经被预约，如果是，则提示用户重新选择。如果该座位尚未被预约，则程序会将该座位的预约时间设置为当前时间加上30分钟，并将预约者的姓名保存在座位数据结构中。程序会一直循环直到用户输入 `quit` 为止。