如何在c中从文件中读取多种数据类型

Question

我必须读取一个包含杂货列表的文件，每行包含 3 个部分：类别、名称、价格

这就是文件的样子：

Fruit,Apple,15.6
Vegetable,Potato,20.0
Fruit,Banana,17.0
Vegetable,Lettuce,13.5

我无法读取这些值并将它们放入链接列表中。

我相信我唯一的问题是正确阅读它们并将它们加载到链接列表中。我用 fscanf 尝试了许多不同的组合，但似乎都没有。

        typedef struct Grocery Grocery;

        struct Grocery
        {
            char category[100];
            char name[100];
            float price;
            Grocery *next;
        };

        Grocery *addNew(char *category, char *name, float price)
        {
            Grocery *newN = (Grocery*)malloc(sizeof(Grocery));

            strcpy(newN->category, category);
            strcpy(newN->name, name);
            newN->price = price;
            newN->next = NULL;

            return newN;
        }

        Grocery *add_on_beginning(Grocery *head, Grocery *newN)
        {
            newN->next = head;

            return newN;
        }

        Grocery *load_file(Grocery *head)
        {
            char filename[100];

            scanf("%s", filename);

            FILE *fp = fopen(filename, "r");

            char *category;
            char *name;
            float price;

            if(fp == NULL)
            {
                printf("Error in loading file.\n");
                return 0;
            }
            else
            {
                while(!feof(fp))
                {
                    fscanf(fp, "%s,%s,%lf\n", category, name, &price);

                    Grocery *newN = addNew(category, name, price);

                    head = add_on_beginning(head, newN);
                }
            }

            fclose(fp);

            printf("File loaded successfully.\n");

            return head;
        }

每当我调试代码时，在打印每个元素后都会得到随机数字和字母，我会得到：

ï&╪5Ç@ 0.000000

更新

感谢大家的帮助，我已经用这个while(fscanf(fp, "%[^,],%[^,],%f\n", category, name, &price) == 3) 让它工作了，有人能解释一下它的作用吗？

Answer 1

解决办法是：

    typedef struct Grocery Grocery;

    struct Grocery
    {
        char category[100];
        char name[100];
        float price;
        Grocery *next;
    };

    Grocery *addNew(char *category, char *name, float price)
    {
        Grocery *newN = (Grocery*)malloc(sizeof(Grocery));

        strcpy(newN->category, category);
        strcpy(newN->name, name);
        newN->price = price;
        newN->next = NULL;

        return newN;
    }

    Grocery *add_on_beginning(Grocery *head, Grocery *newN)
    {
        newN->next = head;

        return newN;
    }

    Grocery *load_file(Grocery *head)
    {
        char filename[100];

        scanf("%s", filename);

        FILE *fp = fopen(filename, "r");

        char category[100];
        char name[100];
        float price;

        if(fp == NULL)
        {
            printf("Error in loading file.\n");
            return 0;
        }
        else
        {
            while(fscanf(fp, "%[^,],%[^,],%f\n", category, name, &price) == 3))
            {
                Grocery *newN = addNew(category, name, price);

                head = add_on_beginning(head, newN);
            }
        }

        fclose(fp);

        printf("File loaded successfully.\n");

        return head;
    }