0.显示已建立的校园卡 1.建立校园卡 2.买饭 3.续钱 4.添加校园卡; 5.注销校园卡 6.设置与解除挂失 7.统计挂失人数 8.退出程序用c语言实现以上功能，要有链表存储和查找算法、排序算法

以下是使用链表实现的C语言代码，包括建立校园卡、买饭、续钱、添加校园卡、注销校园卡、设置与解除挂失、统计挂失人数等功能。代码中使用了选择排序算法对校园卡进行排序。

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

// 校园卡结构体
typedef struct campus_card {
    int num;                // 卡号
    char name[30];          // 姓名
    float balance;          // 余额
    int lost;               // 是否挂失，0表示未挂失，1表示已挂失
    struct campus_card *next;
} CampusCard;

// 初始化链表
CampusCard* init() {
    CampusCard *head = (CampusCard*)malloc(sizeof(CampusCard));
    head->next = NULL;
    return head;
}

// 建立校园卡
void create(CampusCard *head) {
    printf("请输入卡号：");
    int num;
    scanf("%d", &num);
    CampusCard *p = head->next;
    while (p) {
        if (p->num == num) {
            printf("该卡号已存在，请重新输入卡号：");
            scanf("%d", &num);
            p = head->next;
        } else {
            p = p->next;
        }
    }
    CampusCard *card = (CampusCard*)malloc(sizeof(CampusCard));
    card->num = num;
    printf("请输入姓名：");
    scanf("%s", card->name);
    printf("请输入余额：");
    scanf("%f", &card->balance);
    card->lost = 0;
    card->next = NULL;
    p = head;
    while (p->next) {
        p = p->next;
    }
    p->next = card;
    printf("建立成功！\n");
}

// 买饭
void buy_food(CampusCard *head) {
    printf("请输入卡号：");
    int num;
    scanf("%d", &num);
    CampusCard *p = head->next;
    while (p) {
        if (p->num == num) {
            if (p->lost == 1) {
                printf("该卡已挂失，无法进行消费。\n");
            } else {
                printf("请输入消费金额：");
                float cost;
                scanf("%f", &cost);
                if (cost > p->balance) {
                    printf("余额不足，无法进行消费。\n");
                } else {
                    p->balance -= cost;
                    printf("消费成功！当前余额为%.2f元。\n", p->balance);
                }
            }
            return;
        } else {
            p = p->next;
        }
    }
    printf("卡号不存在，请重新输入。\n");
}

// 续钱
void add_money(CampusCard *head) {
    printf("请输入卡号：");
    int num;
    scanf("%d", &num);
    CampusCard *p = head->next;
    while (p) {
        if (p->num == num) {
            if (p->lost == 1) {
                printf("该卡已挂失，无法进行充值。\n");
            } else {
                printf("请输入充值金额：");
                float money;
                scanf("%f", &money);
                p->balance += money;
                printf("充值成功！当前余额为%.2f元。\n", p->balance);
            }
            return;
        } else {
            p = p->next;
        }
    }
    printf("卡号不存在，请重新输入。\n");
}

// 添加校园卡
void add_card(CampusCard *head) {
    CampusCard *p = head;
    while (p->next) {
        p = p->next;
    }
    CampusCard *card = (CampusCard*)malloc(sizeof(CampusCard));
    printf("请输入卡号：");
    scanf("%d", &card->num);
    printf("请输入姓名：");
    scanf("%s", card->name);
    printf("请输入余额：");
    scanf("%f", &card->balance);
    card->lost = 0;
    card->next = NULL;
    p->next = card;
    printf("添加成功！\n");
}

// 注销校园卡
void delete_card(CampusCard *head) {
    printf("请输入卡号：");
    int num;
    scanf("%d", &num);
    CampusCard *p = head->next;
    CampusCard *pre = head;
    while (p) {
        if (p->num == num) {
            pre->next = p->next;
            free(p);
            printf("注销成功！\n");
            return;
        } else {
            pre = p;
            p = p->next;
        }
    }
    printf("卡号不存在，请重新输入。\n");
}

// 设置与解除挂失
void set_lost(CampusCard *head) {
    printf("请输入卡号：");
    int num;
    scanf("%d", &num);
    CampusCard *p = head->next;
    while (p) {
        if (p->num == num) {
            if (p->lost == 0) {
                p->lost = 1;
                printf("挂失成功！\n");
            } else {
                p->lost = 0;
                printf("解除挂失成功！\n");
            }
            return;
        } else {
            p = p->next;
        }
    }
    printf("卡号不存在，请重新输入。\n");
}

// 统计挂失人数
void count_lost(CampusCard *head) {
    int count = 0;
    CampusCard *p = head->next;
    while (p) {
        if (p->lost == 1) {
            count++;
        }
        p = p->next;
    }
    printf("当前挂失人数为%d人。\n", count);
}

// 选择排序算法，按卡号从小到大排序
void sort(CampusCard *head) {
    CampusCard *p = head->next;
    while (p) {
        CampusCard *min = p;
        CampusCard *q = p->next;
        while (q) {
            if (q->num < min->num) {
                min = q;
            }
            q = q->next;
        }
        if (min != p) {
            int temp_num = p->num;
            p->num = min->num;
            min->num = temp_num;
            char temp_name[30];
            strcpy(temp_name, p->name);
            strcpy(p->name, min->name);
            strcpy(min->name, temp_name);
            float temp_balance = p->balance;
            p->balance = min->balance;
            min->balance = temp_balance;
            int temp_lost = p->lost;
            p->lost = min->lost;
            min->lost = temp_lost;
        }
        p = p->next;
    }
}

int main() {
    CampusCard *head = init();
    int choice = -1;
    while (choice != 8) {
        printf("请选择操作：\n");
        printf("0.显示已建立的校园卡\n");
        printf("1.建立校园卡\n");
        printf("2.买饭\n");
        printf("3.续钱\n");
        printf("4.添加校园卡\n");
        printf("5.注销校园卡\n");
        printf("6.设置与解除挂失\n");
        printf("7.统计挂失人数\n");
        printf("8.退出程序\n");
        scanf("%d", &choice);
        switch (choice) {
            case 0: {
                printf("卡号\t姓名\t余额\t是否挂失\n");
                CampusCard *p = head->next;
                while (p) {
                    printf("%d\t%s\t%.2f元\t%s\n", p->num, p->name, p->balance, p->lost == 0 ? "未挂失" : "已挂失");
                    p = p->next;
                }
                break;
            }
            case 1: {
                create(head);
                sort(head);
                break;
            }
            case 2: {
                buy_food(head);
                break;
            }
            case 3: {
                add_money(head);
                break;
            }
            case 4: {
                add_card(head);
                sort(head);
                break;
            }
            case 5: {
                delete_card(head);
                break;
            }
            case 6: {
                set_lost(head);
                sort(head);
                break;
            }
            case 7: {
                count_lost(head);
                break;
            }
            case 8: {
                break;
            }
            default: {
                printf("请输入正确的操作编号！\n");
                break;
            }
        }
        printf("\n");
    }
    return 0;
}