c语言图书管理系统

数据结构

typedef struct Books
{
    char accession_number[20];
    char title[50];
    char author_name[50];
    double price;
    char flag;
}BOOK;

typedef struct Library
{
    BOOK data;
    struct Library* next;
}LIB;

代码:

#pragma warning(disable:4996)
#include<stdio.h>
#include <stdlib.h>


typedef struct Books
{
    char accession_number[20];
    char title[50];
    char author_name[50];
    double price;
    char flag;
}BOOK;

typedef struct Library
{
    BOOK data;
    struct Library* next;
}LIB;

int number = 0;
int mainSelect();
LIB* addBookInfo(int n);
void displayBookInfo(LIB* b);
void searchByAuthor(LIB* b);
void searchByTitle(LIB* b);
void bookNumbers(LIB* b);
void mySort(LIB* b);
void storeFile(LIB* b);

int main()
{
    
    LIB* lib;
    lib = (LIB*)malloc(sizeof(LIB));

    while (1)
    {
        switch (mainSelect()) {
        case 1: // 1. Add book information  
            printf("1. Add book information\n");
            printf("Type in number of book:\n");
            scanf("%d", &number);
            lib = addBookInfo(number);
            printf("Information input success\n");
            break;
        case 2: // 2. Display book information
            printf("2. Display book information\n");
            displayBookInfo(lib);
            break;
        case 3: // 3. List all books of given author 
            printf("3. List all books of given author\n");
            searchByAuthor(lib);
            break;
        case 4: // 4. List the title of specified book 
            printf("4. List the title of specified book\n");
            searchByTitle(lib);
            break;
        case 5: // 5. List the count of books in the library   
            printf("5. List the count of books in the library \n");
            bookNumbers(lib);
            break;
        case 6: // 6. List the books in the order of accession number
            printf("6. List the books in the order of accession number\n");
            mySort(lib);
            break;
        case 7:
            printf("Storing the file \"library.dat\"............\n");
            storeFile(lib);
            printf("Store success! exiting............");
            exit(0);
            break;
        }

    }

    return 0;
}


int mainSelect()
{
    int choice;
    do {
        system("cls");
        printf("            WELCOME TO LIBRARY    \n");
        printf("1. Add book information                              \n");
        printf("2. Display book information                          \n");
        printf("3. List all books of given author                    \n");
        printf("4. List the title of specified book                  \n");
        printf("5. List the count of books in the library            \n");
        printf("6. List the books in the order of accession number   \n");
        printf("7. exit                                              \n");
        printf("\n\n");
        printf("Input your choice: \n");
        scanf("%d", &choice);
    } while (choice < 1 || choice > 7);

    return choice;
}


LIB* addBookInfo(int n)
{
    LIB* p, * q, * h;
    h = (LIB*)malloc(sizeof(LIB));
    p = (LIB*)malloc(sizeof(LIB));
    q = (LIB*)malloc(sizeof(LIB));
    int i;
    for (i = 0; i < n; i++)
    {
        p = (LIB*)malloc(sizeof(LIB));
        printf("Type in Accession number:\n");
        scanf("%s", &p->data.accession_number);
        printf("Type in Title of the book:\n");
        scanf("%s", &p->data.title);
        printf("Type in Author name:\n");
        scanf("%s", &p->data.author_name);
        printf("Type in Price of the book:\n");
        scanf("%lf", &p->data.price);
        printf("If book is issued or not(Y or N):\n");
        scanf("%s", &p->data.flag);

        p->next = NULL;
        if (i == 0)
            h = p;
        else
            q->next = p;
        q = p;
    }
    return h;
}

void displayBookInfo(LIB* h)
{
    LIB* b = h;
    while (b != NULL)
    {

        printf("Accession number : %s \n", b->data.accession_number);
        printf("title of the book : %s \n", b->data.title);
        printf("author name : %s \n", b->data.author_name);
        printf("price of the book : %lf \n", b->data.price);
        printf("flag : %c \n", b->data.flag);

        b = b->next;


    }
    printf("press to continue ");
    getch();
}

void searchByAuthor(LIB* h)
{
    LIB* b;
    b = h;
    
    printf("Type in the name of author: \n");
    char name[50];
    scanf("%s", &name);
    while (b != NULL)
    {
        if (strcmp(b->data.author_name, name) == 0)
        {
            printf("Accession number : %s \n", b->data.accession_number);
            printf("Title of the book : %s \n", b->data.title);
            printf("Author name : %s \n", b->data.author_name);
            printf("Price of the book : %lf \n", b->data.price);
            printf("Flag : %c \n", b->data.flag);
            break;
        }
        else
            b = b->next;
    }
    getch();
   
}

void searchByTitle(LIB* h)
{
    LIB* b;
    b = h;
    printf("please input the title: \n");
    char name[50];
    scanf("%s", &name);
    while (b != NULL)
    {
        if (strcmp(b->data.title, name) == 0)
        {
            printf("Accession number : %s \n", b->data.accession_number);
            printf("title of the book : %s \n", b->data.title);
            printf("author name : %s \n", b->data.author_name);
            printf("price of the book : %lf \n", b->data.price);
            printf("flag : %c \n", b->data.flag); 
            break;
        }
        else
            b = b->next;
    }
    getch();
}


void bookNumbers(LIB* h)
{
    LIB* b;
    b = h;
    int number = 0;

    while (b != NULL)
    {
        if (b->data.flag == 'N')
        {
            number++;
        }
        b = b->next;


    }

    printf("there are %d books in library.\n", number);
    getch();

}

void mySort(LIB* h)
{
    int x, i = 1;
    BOOK t;
    LIB* p, * r, * s;
    p = h;
    r = p->next;
    s = r->next;

    while (p != NULL)
    {
        while (r != NULL)
        {
            if (strcmp(p->data.accession_number, r->data.accession_number) > 0)
            {
                t = p->data;
                p->data = r->data;
                r->data = t;
            }
            else
                r = r->next;
        }
        p = p->next;
        r = s;
    }

    p = h;
    printf("Sort finished!\n");

}

void storeFile(LIB* b)
{
    FILE* fp;
    if ((fp = fopen("library.dat", "ab+")) == NULL) {
        fputs("Can not open book.dat file", stderr);
        exit(1);
    }
    while (b != NULL)
    {
        fprintf(fp, "%S ", b->data.accession_number);
        b = b->next;
    }

    fclose(fp);

}