请按照案例写一个会员信息管理系统

Question

请写一个代码管理会员信息，会员余位为2。录入会员信息并可选择功能查询。（注：malloc,calloc,realloc,free等函数希望可以用上；用户输入数字1~7，即转入相应的功能）具体案例如下：

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Answer 1

代码如下，完全按照案例编写。
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#include <stdio.h>
#include <string.h>
#include <stdlib.h>

typedef struct _member {
    char first_name[20];
    char last_name[20];
    int number;
    int joined;
    int fee[5];
} Member;

typedef struct _node {
    Member member;
    struct _node *next;
} Node;

Node *create_head()
{
    Node *head = (Node *)malloc(sizeof(Node));
    if(head == NULL) {
        return NULL;
    }
    head->next = NULL;
    return head;
}

void free_head(Node *head)
{
    if(head == NULL) {
        return;
    }
    Node *p = head;
    Node *q = p;
    while(p) {
        q = p->next;
        free(p);
        p = q;
    }
}

void add(Node *head)
{
    if(head == NULL) {
        return;
    }
    int n = 0;
    Node *node = (Node *)malloc(sizeof(Node));
    node->next = NULL;
    printf("Give the first and last name > ");
    scanf("%s %s", node->member.first_name, node->member.last_name);
    printf("Give member number > ");
    scanf("%d", &node->member.number);
    printf("Give year joined > ");
    scanf("%d", &node->member.joined);
    printf("Give fee for year 2017 > ");
    scanf("%d", &node->member.fee[0]);
    printf("Give fee for year 2018 > ");
    scanf("%d", &node->member.fee[1]);
    printf("Give fee for year 2019 > ");
    scanf("%d", &node->member.fee[2]);
    printf("Give fee for year 2020 > ");
    scanf("%d", &node->member.fee[3]);
    printf("Give fee for year 2021 > ");
    scanf("%d", &node->member.fee[4]);
    for(int i=0; i<5; i++) {
        if(node->member.fee[i] == 0) {
            n++;
        }
    }
    printf("Free slots %d\n", n);
    Node *p = head;
    while(p) {
        if(p->member.number == node->member.number) {
            printf("\n");
            printf("Add failed, member number is exist!\n");
            printf("\n");
            break;
        }
        if(p->next == NULL) {
            p->next = node;
            break;
        }
        p = p->next;
    }
}

void remove(Node *head)
{
    if(head == NULL) {
        return;
    }
    int number;
    printf("Give member number to remove > ");
    scanf("%d", &number);
    Node *pre = head;
    Node *p = head->next;
    while(p) {
        if(p->member.number == number) {
            pre->next = p->next;
            free(p);
            p = NULL;
            break;
        }
        pre = p;
        p = p->next;
    }
}

void update(Node *head)
{
    if(head == NULL) {
        return;
    }
    int number, select;
    printf("Give member number to update > ");
    scanf("%d", &number);
    Node *p = head->next;
    while(p) {
        if(p->member.number == number) {
            break;
        }
        p = p->next;
    }
    if(p == NULL) {
        return;
    }
    printf("\n");
    printf("1 Change last name\n");
    printf("2 Change member number\n");
    printf("3 Change year joined\n");
    printf("4 Change member fees\n");
    printf("Select > ");
    scanf("%d", &select);
    if(select == 1) {
        printf("Give new last name > ");
        scanf("%s", p->member.last_name);
    }
    else if(select == 2) {
        printf("Give new member number > ");
        scanf("%d", &p->member.number);
    }
    else if(select == 3) {
        printf("Give new year joined > ");
        scanf("%d", &p->member.joined);
    }
    else if(select == 4) {
        printf("Give new fee for year 2017 > ");
        scanf("%d", &p->member.fee[0]);
        printf("Give new fee for year 2018 > ");
        scanf("%d", &p->member.fee[1]);
        printf("Give new fee for year 2019 > ");
        scanf("%d", &p->member.fee[2]);
        printf("Give new fee for year 2020 > ");
        scanf("%d", &p->member.fee[3]);
        printf("Give new fee for year 2021 > ");
        scanf("%d", &p->member.fee[4]);
        int n = 0;
        for(int i=0; i<5; i++) {
            if(p->member.fee[i] == 0) {
                n++;
            }
        }
        printf("Free slots %d\n", n);
    }
}

void print_member(Node *head)
{
    if(head == NULL) {
        return;
    }
    int number;
    printf("Give member number > ");
    scanf("%d", &number);
    printf("\n");
    printf("********************************\n\n");
    Node *p = head->next;
    while(p) {
        if(p->member.number == number) {
            break;
        }
        p = p->next;
    }
    if(p) {
        printf("First name: %s\n", p->member.first_name);
        printf("Last name:  %s\n", p->member.last_name);
        printf("Member num: %d\n", p->member.number);
        printf("Joined:     %d\n", p->member.joined);
        printf("\n");
    }
    else {
        printf("Not found, cannot print data!\n");
        printf("\n");
    }
    printf("********************************\n");
}

void print_register(Node *head)
{
    if(head == NULL) {
        return;
    }
    printf("********************************\n\n");
    Node *p = head->next;
    while(p) {
        printf("First name: %s\n", p->member.first_name);
        printf("Last name:  %s\n", p->member.last_name);
        printf("Member num: %d\n", p->member.number);
        printf("Joined:     %d\n", p->member.joined);
        printf("\n");
        p = p->next;
    }
    printf("********************************\n");
}

void search(Node *head)
{
    if(head == NULL) {
        return;
    }
    int select;
    printf("1 Search first name\n");
    printf("2 Search last name\n");
    printf("3 Search member number\n");
    printf("4 Search year joined\n");
    printf("Select > ");
    scanf("%d", &select);
    printf("\n");
    if(select == 1) {
        char name[20];
        printf("Give first name > ");
        scanf("%s", name);
        Node *p = head->next;
        while(p) {
            if(strcmp(p->member.first_name, name) == 0) {
                printf("\n");
                printf("First name: %s\n", p->member.first_name);
                printf("Last name:  %s\n", p->member.last_name);
                printf("Member num: %d\n", p->member.number);
                printf("Joined:     %d\n", p->member.joined);
                printf("\n");
            }
            p = p->next;
        }
    }
    else if(select == 2) {
        char name[20];
        printf("Give last name > ");
        scanf("%s", name);
        Node *p = head->next;
        while(p) {
            if(strcmp(p->member.last_name, name) == 0) {
                printf("\n");
                printf("First name: %s\n", p->member.first_name);
                printf("Last name:  %s\n", p->member.last_name);
                printf("Member num: %d\n", p->member.number);
                printf("Joined:     %d\n", p->member.joined);
                printf("\n");
            }
            p = p->next;
        }
    }
    else if(select == 3) {
        int number;
        printf("Give member number > ");
        scanf("%d", &number);
        Node *p = head->next;
        while(p) {
            if(p->member.number == number) {
                printf("\n");
                printf("First name: %s\n", p->member.first_name);
                printf("Last name:  %s\n", p->member.last_name);
                printf("Member num: %d\n", p->member.number);
                printf("Joined:     %d\n", p->member.joined);
                printf("\n");
            }
            p = p->next;
        }
    }
    else if(select == 4) {
        int joined;
        printf("Give year joined > ");
        scanf("%d", &joined);
        Node *p = head->next;
        while(p) {
            if(p->member.joined == joined) {
                printf("\n");
                printf("First name: %s\n", p->member.first_name);
                printf("Last name:  %s\n", p->member.last_name);
                printf("Member num: %d\n", p->member.number);
                printf("Joined:     %d\n", p->member.joined);
            }
            printf("\n");
            p = p->next;
        }
    }
}

void menu()
{
    int select, running = 1;
    Node *head = create_head();
    while(running == 1) {
        printf("1 Add new member\n");
        printf("2 Remove a member\n");
        printf("3 Updata member\n");
        printf("4 Print member\n");
        printf("5 Print register\n");
        printf("6 Search\n");
        printf("7 End\n");
        printf("Select > ");
        scanf("%d", &select);
        printf("\n");
        switch (select) {
        case 1:
            add(head);
            break;
        case 2:
            remove(head);
            break;
        case 3:
            update(head);
            break;
        case 4:
            print_member(head);
            break;
        case 5:
            print_register(head);
            break;
        case 6:
            search(head);
            break;
        case 7:
            running = 0;
            break;
        default:
            break;
        }
        printf("\n");
    }
    free_head(head);
}

int main()
{
    menu();

    return 0;
}