结构体数据录入以后输出的不对，不知道是哪里出错了

hunterac

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

struct Date {
        int year;
        int month;
        int day;
};

struct Book {
        char title[40];
        char author[40];
        float price;
        struct Date date;
        char publisher[40];
};

void BookInput(struct Book *book);
void BookPrintf(struct Book *book);

void BookInput(struct Book *book) {
        printf("请输入书名：");
        scanf("%s", book->title);
        printf("请输入作者名：");
        scanf("%s", book->author);
        printf("请输入价格：");
        scanf("%f", &book->price);
        printf("请输入出版日期：");
        scanf("%d %d %d", &book->date.year, &book->date.month, &book->date.day);
        printf("请输入出版社名：");
        scanf("%s", book->publisher);
}

void BookPrint(struct Book *book) {
        printf("书名：%s\n", book->title);
        printf("作者：%s\n", book->author);
        printf("价格：%.2f\n", book->price);
        printf("出版日期：%d年%d月%d日\n", book->date.year, book->date.month, book->date.day);
        printf("出版社：%s\n", book->publisher);
}

int main(void) {
        int count = 0, i, flag;
        struct         Book *library[count];

        printf("欢迎登陆图书录入系统，请录入...\n");
        do {
                library[count] = (struct Book *)malloc(sizeof(struct Book));
                BookInput(library[count]);
                count++;
                printf("录入成功！选择是否继续录入(1是/0否)：");
                scanf("%d", &flag);
                getchar();
                putchar('\n');
        } while (flag);

        printf("\n\n-------你一共录入了%d本书-------\n\n", count);

        for (i = 0; i < count; i++) {
                BookPrint(library[i]);
                putchar('\n');
        }

        return 0;
}

yuxijian2020

你第一次分配内存的时候 count 是 0！！！

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

struct Date {
    int year;
    int month;
    int day;
};

struct Book {
    char title[40];
    char author[40];
    float price;
    struct Date date;
    char publisher[40];
};

void BookInput(struct Book* book);
//void BookPrintf(struct Book* book);
void InputString(char* str)
{
    char c = 0;
    int i = 0;

    while ((c = getchar()) != '\n')
    {
        if (c != '\n')
        {
            str[i] = c;
            i++;
        }
    }
    str[i] = '\0';
}

void BookInput(struct Book* book) {
    printf_s("请输入书名：");
    //scanf_s("%s", &book->title, 2);
    InputString(book->title);
    printf_s("请输入作者名：");
    //scanf_s("%s", &book->author, 2);
    InputString(book->author);
    printf_s("请输入价格：");
    scanf_s("%f", &book->price);
    printf_s("请输入出版日期：");
    scanf_s("%d%*c%d%*c%d%*c", &book->date.year, &book->date.month, &book->date.day);// %*c 过滤中间的字符和最后的\n
    printf_s("请输入出版社名：");
    //scanf_s("%s", &book->publisher, 2);
    InputString(book->publisher);
}

void BookPrint(struct Book* book) {
    printf_s("书名：%s\n", book->title);
    printf_s("作者：%s\n", book->author);
    printf_s("价格：%.2f\n", book->price);
    printf_s("出版日期：%d年%d月%d日\n", book->date.year, book->date.month, book->date.day);
    printf_s("出版社：%s\n", book->publisher);
}

int main(void) {
    int count = 0, i, flag = 1;
    struct Book* library = (struct Book*)malloc(sizeof(struct Book));
    if (!library)
    {
        printf_s("申请空间失败!\n");
        return -1;
    }

    printf_s("欢迎登陆图书录入系统，请录入...\n");
    
    for (i = 1; flag; i++)
    {
        
        if (i != 1)
        {
            struct Book* temp = (struct Book*)realloc(library, i * sizeof(struct Book));    //重新分配内存
            if (!temp)
            {
                printf_s("申请空间失败!\n");
                return -1;
            }
            library = temp;
        }

        BookInput(&library[i - 1]);
        count = i;
        printf("录入成功！选择是否继续录入(1是/0否)：");
        scanf_s("%d%*c", &flag);
    }

    printf_s("\n\n-------你一共录入了%d本书-------\n\n", count);

    for (i = 0; i < count; i++) {
        BookPrint(&library[i]);
        //putchar('\n');
    }

    free(library);
    return 0;
}

yuxijian2020

字符串输入我重写了个方法  scanf我试的时候总是不大好使
还有scanf后面我都加了个%*c  过滤 \n
不然这个 \n 会带到下一次输入