dengyk 发表于 2020-9-13 13:23:11

请问各位这段代码是哪里出问题了呀，出现段错误的提示

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

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

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

void getInput(struct Book* book)
{
    int count = 1;

    printf("Enter the %d's book name\n", count);
    scanf("%s", book->title);
    printf("Enter the author name\n");
    scanf("%s", book->author);
    printf("Enter the price\n");
    scanf("%f", &book->price);
    printf("Enter the date\n");
    scanf("%d %d %d", &book->date.year, &book->date.month, &book->date.day);
    printf("Enter the publisher\n");
    scanf("%s", book->publisher);
}

void printBook(struct Book* book)
{
    printf("Book name: %s\n", book->title);
    printf("Book author: %s\n", book->author);
    printf("Book price: %.2f\n", book->price);
    printf("Book date: %d-%d-%d", book->date.year, book->date.month, book->date.day);
    printf("Book publisher: %s", book->publisher);
}

void getSize(struct Book* book)
{
    book = (struct Book*)malloc(sizeof(struct Book));
    if (book == NULL)
    {
      printf("Error\n");
      exit(1);
    }
}

void freeLibrary(struct Book* book)
{
    free(book);
}

void main()
{
    int n;
    printf("How many books do you want to save?\n");
    scanf("%d", &n);
    struct Book* library;

    printf("Now start save book\n");
    for (int i = 0; i < n; i++)
    {
      getSize(library);
      getInput(library);
    }

    printf("Now list the information about all book\n");
    for (int i = 0; i < n; i++)
    {

      printf("This is the %d's book\n", i + 1);
      printBook(library);
    }

    for (int i = 0; i < n; i++)
    {
      freeLibrary(library);
    }
}

一枚丶学渣 发表于 2020-9-13 13:44:47

你可以把那个i 放前边和n一块定义了应该就能运行了

dengyk 发表于 2020-9-13 14:08:57

一枚丶学渣 发表于 2020-9-13 13:44
你可以把那个i 放前边和n一块定义了应该就能运行了

能运行，而且也不报错，可是运行到输入作者时就提示段错误，核心转存&#128579;

sunrise085 发表于 2020-9-13 14:39:39

本帖最后由 sunrise085 于 2020-9-13 14:40 编辑

你在main中定义的是结构体指针数组，然后给指针分配空间，这样是有问题的，调用函数getSize动态分配给指针空间，函数结束后，就无效了。

应该是定义结构体数组，然后给数组内的每个元素动态分配空间
最后释放的时候先释放后面的元素
#include <stdio.h>
#include <stdlib.h>

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

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

void getInput(struct Book* book)
{
    int count = 1;

    printf("Enter the %d's book name\n", count);
    scanf("%s", book->title);
    printf("Enter the author name\n");
    scanf("%s", book->author);
    printf("Enter the price\n");
    scanf("%f", &book->price);
    printf("Enter the date\n");
    scanf("%d %d %d", &book->date.year, &book->date.month, &book->date.day);
    printf("Enter the publisher\n");
    scanf("%s", book->publisher);
}

void printBook(struct Book* book)
{
    printf("Book name: %s\n", book->title);
    printf("Book author: %s\n", book->author);
    printf("Book price: %.2f\n", book->price);
    printf("Book date: %d-%d-%d", book->date.year, book->date.month, book->date.day);
    printf("Book publisher: %s", book->publisher);
}

void getSize(struct Book* book)
{
    book = (struct Book*)malloc(sizeof(struct Book));
    if (book == NULL)
    {
      printf("Error\n");
      exit(1);
    }
}

void freeLibrary(struct Book* book)
{
    free(book);
}

void main()
{
    int n;
    printf("How many books do you want to save?\n");
    scanf("%d", &n);
    struct Book library;//这里定义成结构体数组

    printf("Now start save book\n");
    for (int i = 0; i < n; i++)
    {
      getSize(&library);//这里实参为地址，下面几个函数调用时，实参也一样
      getInput(&library);
    }

    printf("Now list the information about all book\n");
    for (int i = 0; i < n; i++)
    {

      printf("This is the %d's book\n", i + 1);
      printBook(&library);
    }

    for (int i = n; i >0; i++)
    {
      freeLibrary(&library);
    }
}

dengyk 发表于 2020-9-13 16:03:40

sunrise085 发表于 2020-9-13 14:39
你在main中定义的是结构体指针数组，然后给指针分配空间，这样是有问题的，调用函数getSize动态分配给指针 ...

谢谢老哥{:5_109:}
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