求指点：C语言链表读文件有关的问题！！ 着急坐等！！！！！！

[maspacious]

我用fwrite写到文件，但是用fread读取的时候第一行总是有一段乱码
对链表的读写不是很懂 也是照着网上自己改的 怎样避免出现乱码？求指点

#include <stdio.h>
#include <stdlib.h>
typedef struct StuNode
{
	int num;
	char name[20];
	char sex[4];
	int english_score;
	int c_score;
	struct StuNode *next;
}StuList;

void main()
{
	StuList *input();
	void read_file();
	void write_file(StuList *head);

	StuList *head;
	head=input();
	write_file(head);
	read_file();

	system("pause");
}

StuList *input()
{
	int x;
	bool z=true;
	StuList *head,*stu;
	head = NULL;
	while(z)
	{
		stu = (StuList*)malloc(sizeof(StuList));
		scanf("%d%s%s%d%d",&stu->num,&stu->name,&stu->sex,&stu->english_score,&stu->c_score);
		stu->next = head;
		head=stu;
		printf("是否继续输入下一项记录（1、继续   2、退出）：");
		scanf("%d",&x);
		if(x == 1)
		{
			z=true;
		}
		else if( x == 2)
		{
			z=false;
		}
	}
	return head;
}
void write_file(StuList *head)
{
	FILE *fp;
	if((fp=fopen("student.txt","a")) == NULL)
	{
		printf("加载失败！");
		return;
	}
	for (head ; head != NULL ; head = head->next)
	{
		fwrite(head,sizeof(StuList),1,fp);
	}
	fclose(fp);
}
void read_file()
{
	StuList *head,*stu,*r,*t;                       //改动：添加*t，作为标记
    FILE *fp;
    if((fp=fopen("student.txt","r"))==NULL)
    {
		printf("加载失败!");
     }
     head=r=(StuList*)malloc(sizeof(StuList));
	 while(!feof(fp))
     {
        stu=(StuList*)malloc(sizeof(StuList));;
        fread(stu,sizeof(StuList),1,fp);
        r->next=stu;
        t=r;
        r=stu;
     }
    t->next=NULL;//改动，添加*t
    fclose(fp);
	if(head == NULL)
	{
		 printf("没有数据！");
	}
	else
	{
		for( head ;head != NULL;head = head -> next )
			printf("学号：%5d  姓名：%5s  性别：%5s  英语成绩：%5d  C语言成绩：%d\n",
			head->num,head->name,head->sex,head->english_score,head->c_score);
	}
}

[转角天边]

for( head ;head != NULL;head = head -> next ) 改成 for( head=head->next ;head != NULL;head = head -> next )

[转角天边]

建议 scanf("%d%s%s%d%d",&stu->num,&stu->name,&stu->sex,&stu->english_score,&stu->c_score); 这个中间加点空格 scanf("%d %s %s % d %d",&stu->num,&stu->name,&stu->sex,&stu->english_score,&stu->c_score); 以区分输入的是哪个