{
struct student *head;
struct student *p1,*p2;
head=NULL;
for(n=0;n<a;n++) //這裏改成for
{
p1=(struct student*)malloc(LEN);
scanf("%ld %s %s %d",&p1->num,p1->name,p1->sex,&p1->age); //這裏改成空格才可以保證name sex正確輸入！！
if(n==0) head=p1;
else p2->next=p1;
p2=p1;
}
p1->next=NULL;
return(head);
}
int main()
{
struct student *p1,*head,*p2;
int n;
long t;
printf("please input the total number");
scanf("%d",&n);
head=p1=p2=creat(n);
printf("please input the num you want to delete");
scanf("%ld",&t);
//while(t!=p1->num&&p1!=NULL){ p2=p1;p1=p1->next;}
while( p1!=NULL && t!=p1->num){ p2=p1;p1=p1->next;} //要先判斷p1是否為空，再判斷數據是否相同，否則找不到數據時會出錯
if(p1==NULL) printf("the num you want to delete is not exist");
else
{
printf("%ld,\n%s,\n%s,\n%d\n",p1->num,p1->name,p1->sex,p1->age);
if(p1==head) head=p1->next;
/**以下兩句是廢話**
else if(p1->next==NULL) p2->next=NULL;
else p2->next=p1->next;
****/
p2->next=p1->next;
free(p1); //刪除了，就釋放掉這個結點
}
//顯示壹下 剩余的數據
printf("\n" );
p1=head;
while ( p1 )
{
printf("%ld, %s, %s, %d\n",p1->num,p1->name,p1->sex,p1->age);
p1=p1->next;
}
return 0;
}