#include<stdio.h>

struct stu
{
  long num;
  float score;
  struct stu *next;

};

struct stu * insert(struct stu *head1,struct stu *head2)  //两表都不为空,把head2表插入到head1中,按num的大小插入到合适的位置上,最后形成新的链表.
{
  struct stu *p1,*p2,*pnew;      //p1,p2用于head1中,pnew用于head2中
  
    pnew=head2;
    while(pnew!=NULL)
     {  p1=head1;
        while((pnew->num>p1->num)&&(p1->next!=NULL))
        {
            p2=p1;
            p1=p1->next;
        }
        if(pnew->num<=p1->num)
        {
            pnew->next=p1;              
            if(p1==head1) head1=pnew;
            else p2->next=pnew;
        }
        else
        {
            p1->next=pnew;
            pnew->next=NULL;
        }
        
        
        pnew=pnew->next;  
     }
 
  
  return head1;

}

int main()
{
  struct stu *head3,*head4,*p,*p0,*qp=NULL;
  struct stu a,b,c,d,e,f;
  a.num=1002;a.score=80;
  b.num=1004;b.score=76;
  c.num=1005;c.score=92;
  d.num=1001;d.score=88;
  e.num=1003;e.score=70;
  f.num=1006;f.score=69;
 head3=&a;a.next=&b;b.next=&c;c.next=NULL;
 head4=&d;d.next=&e;e.next=&f;f.next=NULL;
 
 p=head3;p0=head4;
 while(p)
 {
   printf("%ld %5.1f\n",p->num,p->score);  //先输出head1表
   p=p->next;
 }
 while(p0)
 {
   printf("%ld %5.1f\n",p0->num,p0->score); //再输出head2表
   p0=p0->next;
 }
 qp=insert(head3,head4);       //这个有问题,请帮忙看下.
 while(qp)
 {
   printf("%ld %5.1f\n",qp->num,qp->score); //再输出两表按num从小到大合并好的表
   qp=qp->next;
 }
 printf("sucsess!\n");
 return 0;
}

有人吗?版主给看下呀...晕..想了一天都不明白哪里错了...