#include<stdio.h>
#include<malloc.h>
#define len sizeof(struct student)
struct student
 { long num;
     float score;
     struct student *next;
 };
struct student *creat(void)
 { struct student *p1,*p2,*head;
     int n=0;
     p1=p2=(struct student *)malloc(len);
     printf("请输入学号和成绩(格式为：学号，成绩。输入0则结束)：\n");
     scanf("%ld,%f",&p1->num,&p1->score);
     head=NULL;
     while(p1->num!=0)
     {   n++;
         if(n==1)  head=p1;
         else p2->next=p1;
         p2=p1;
         p1=(struct student *)malloc(len);
         scanf("%ld,%f",&p1->num,&p1->score);
     }
     p2->next=NULL;
     return(head);
 }
 void output(struct student *head)
 {
     struct student *p;
     p=head;
     if(head!=NULL)
     printf("输出成绩：\n");
     do
     { printf("%ld   %.0f\n",p->num,p->score);
         p=p->next;
     }while(p!=NULL);
 }
 struct student *shan(struct student *head,long x)
 {
  struct student *p1,*p2;
      p1=head;
      while(x!=p1->num&&p1->next!=NULL)
      { p2=p1;p1=p1->next;}
       p2->next=p1->next;
          printf("%ld\n",x);
      
      return(head);
}
 void main()
 {   long x;
     struct student *p,*head;
     head=creat();
     p=head;
     output(p);
     printf("请输入要删除学生的学号：");
     scanf("%ld",&x);
     p=(struct student *)shan(p,x);
     output(p);
}

[ 本帖最后由 xdh0817 于 2011-11-13 00:27 编辑 ]

#include<stdio.h>
#include<malloc.h>
#define len sizeof(struct student)
struct student
{ long num;
     float score;
     struct student *next;
};
struct student *creat(void)
{ struct student *p1,*p2,*head;
     int n=0;
     p1=p2=(struct student *)malloc(len);
     scanf("%ld,%f",&p1->num,&p1->score);
     head=NULL;
     while(p1->num!=0)
     {   n++;
         if(n==1)  head=p1;
         else p2->next=p1;
         p2=p1;
         p1=(struct student *)malloc(len);
         scanf("%ld,%f",&p1->num,&p1->score);
     }
     p2->next=NULL;
     return(head);
}
void output(struct student *head)
{
     struct student *p;
     p=head;
     if(head!=NULL)
     do
     { printf("%ld   %.0f\n",p->num,p->score);
         p=p->next;
     }while(p!=NULL);
}
struct student *del(struct student *head,long num)
{
  struct student *p1,*p2;
      if(head==NULL) {printf("cuowu"); goto end;}//在这里
      p1=head;
      while(num!=p1->num&&p1->next!=NULL)
      { p2=p1;p1=p1->next;}
      if(num==p1->num)
      {if(p1==head) head=p1->next;
          else p2->next=p1->next;
          printf("%ld\n",num);
      }
      else printf("%ld is not found\n",num);
      return(head);
}
void main()
{   long num;
     struct student *p,*head;
     head=creat();
     p=head;
     output(p);
     scanf("%ld",&num);
     p=(struct student *)del(p,num);
     output(p);
}

已经改好了，不过还是谢谢喽

if(head==NULL) {printf("cuowu"); goto end;}