#include<stdio.h>
#include<string.h>
#include<stdlib.h>
struct stu{
int num;
char name[20];
int score;
};//定义一个学生信息结构体
struct st{
int num;
char name[20];
int score;
struct st *next;
};//定义一个学生信息链表结点
struct st *top,*rear;//定义链表头尾指针
struct st* push (struct stu x)
{
struct st *p;
p=(struct st*)malloc(sizeof(struct st));
p->num=x.num;
strcpy(p->name,x.name);
p->score=x.score;
p->next=NULL;
if(rear==NULL)
{
rear=top=p;
}
else{
rear->next=p;
rear=p;
}
return p;
}//将结构体元素依次放入链表尾
void sort (struct st *top)
{
int flag;
struct st *q,*s;
int temp1,temp3;
char temp2[20];
for(q=top->next;q->next!=NULL;q=q->next)
{
flag=0;
s=q->next;
if(q->num<s->num)
{
flag=1;
temp1=q->num; q->num=s->num;s->num=temp1;
temp3=q->score;q->score=s->score;s->score=temp3;
strcpy(temp2,q->name);strcpy(q->name,s->name);strcpy(s->name,temp2);
}
if(flag==0)
break;
}
}//按照学号从大到小的顺序进行排序节点
int main()
{
FILE *in,*out;
in=fopen("in.txt","r");
out=fopen("out.txt","w");//打开文件
int n,m;
struct stu card;
scanf("%d",&n);
m=n;
while(m!=0)
{
fread(&card,sizeof(struct stu),1,in);
if(card.num>0)
{
m--;
push(card);
}
}//若学号符合要求则连人链表
sort(top);
struct st *k;
for(k=top;k!=NULL;k=k->next)
{
fwrite(&card,sizeof(struct stu),1,out);
}//写入out文件
fclose(in);
fclose(out);//关闭文件
return 0;
}
为啥运行后没有反应呢
out文件中没有我想要的数据