student.c 文件内容如下：
    #include <stdio.h>
    #include <stdlib.h>
    struct student {
        char name[20];
        int num;
        double score;
        struct student *next;
    };
   
    int main()
    {
        struct student *create_list(int num);
        int num = 6;
        struct student *q;
        q = create_list(num);
        return 0;
    }
    struct student *create_list(int num)
    {
        FILE *fp;
        struct student *list;
        struct student *head;
        struct student *q;
        head = (struct student *)malloc(sizeof(struct student));
        head->next = NULL;
        p = head;
        fp = fopen("file","w");
        if(fp == NULL)
        {
            printf(" 打开文件失败 \n");
            exit(-1);
        }
        while(num > 0)
        {
            list = (struct student *)malloc(sizeof(struct student));
            printf(" 输入学生姓名 \n");
            scanf("%s",list->name);
            printf(" 输入学生学号 \n");
            scanf("%d",&list->num);
            printf(" 输入学生成绩 \n");
            scanf("%lf",&list->score);
            fwrite(list,sizeof(struct student),1,fp);
            p->next = list;
            list = p;
            num--;
        }
        fclose(fp);
        return head;
    }
此程序是把学生的相关信息写入文件 file 中

rdfile.c 文件内容如下:
    #include <stdio.h>
    #include <string.h>
    struct student {
        char name[20];
        int num;
        double score;
        struct student *next;
    };
   
    int main()
    {
        struct student list;
        FILE *fp;
        fp = fopen("file","r");
        if(fp == NULL)
        {
            printf(" 打开文件失败 \n");
            exit(-1);
        }
        while(feof(fp) != 0)
        {
            fread((struct student *)&list,sizeof(struct student),1,fp);
            printf("%s",list.name);
            printf("%d",list.num);
            printf("%lf",list.score);
        }
        fclose(fp);
        return 0;
    }
此程序意在读取 student.c（上个程序）写入文件的内容。 。。。。 希望各位大侠指导下这个读程序为什么失败，小弟万分感谢。。。。。

[ 本帖最后由 华夏永荣 于 2012-5-29 21:10 编辑 ]

试试fscanf

能写入文件，但是读不出来。。。。。。

struct student *list;
list没有分配内存

更改之后也是读不出来。。。。。。。

怎么修改的？

在 rdfile.c 文件中，定义为 struct student list;

把修改的代码贴全了

麻烦您看下，上面的代码；以前是 “struct student *list;” 现在是 “struct student list”;

struct student list
list是结构体，不是指针了，那么打印出来的时候: printf("%s",list->name);用"->"能编过吗？要用"."