Question

搞定了。我只是愚蠢而且在一个地方写了=而不是== t.t谢谢大家。

我有我的数据文件，现在我想读它并把它放到列表中。我不完全知道怎么做，因为我不得不在不久的将来完成这个项目，我只是请你帮忙;]

头文件：

typedef struct
{
    char category[50];
    char name[50];
    char ingredients[50]; 
    char instruction[1000];
}recipe_t;



typedef struct element
{
    struct element *next;
    recipe_t recipe;

} el_list;

void all_recipe_list();
void show_all_list(el_list *list);
void add_new_element_to_list(el_list *list, recipe_t formula);

我的列表函数文件：

void all_recipe_list() //reading all record into list + show it(show_all_list function)
{
FILE *database;
recipe_t formula;
el_list *head;

        head = NULL; 

    database = fopen(filename, "rb");
        fgetc(database);        // function feof returns value only if we read something before, so in order to check if its end, we try to read one char 
                                // when writing data to file, I put \n always before new record 
    while (!feof(database))
    {
        fread(&formula, sizeof(recipe_t),1,database);   

        if (head == NULL)
        {   
            head = malloc(sizeof(el_list));
            head->recipe = formula;
            head->next = NULL;
        }
        else
        {
        add_new_element_to_list(head,formula);
        }

        fgetc(database);    // same as above
    }
    fclose(database);


        show_all_list(head);

}


void show_all_list(el_list *list)
{
el_list *p=list;

    while (p != NULL)
    {
        printf("Kategoria:%s\n", p->recipe.category);
        printf("Nazwa:%s\n", p->recipe.name);
        printf("Skaldniki:%s\n", p->recipe.ingredients);
        printf("Instrukcja:%s\n", p->recipe.instruction);

        p = p->next;
    }
}

void add_new_element_to_list(el_list *list, recipe_t formula)
{
el_list *p, *new_el;

        p = list;
        while (p->next != NULL)
        {
            p = p->next;
        }

        new_el = malloc(sizeof(el_list));
        new_el->recipe = formula;
        new_el->next = NULL;
        p->next= new_el;
}

有什么问题？程序正在编译好，但是当调用all_recipe_list时它会崩溃。 add_new_element_to_list可能有问题。虽然无法弄明白。另外我不知道在show_all_list中p-＆gt; recipe.category是否正确。

Answer 1

在add_new_element_to_list()这一行：

new_el->recipe;

应为：

new_el->recipe = recipe;

我认为。

Answer 2

尝试将new_el->recipe;功能中的new_el->recipe = recipe;行更改为add_new_element_to_list()。

C，从文件创建单向链表

2 个答案: