我写的C语言-学生选修课系统，但有点错，谁能帮我改正

//7《学生选修课程系统》设计任务
//（1）输入功能：输入30名学生学号、班级、姓名、选修课名称。
//（2）设置要求：每个学生至少选修3科，总选修科目至少设置15科。
//（3）查询功能：按学号、姓名、选修课显示各选修课上课时间和地点。

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<malloc.h>
typedef struct subjects
{
 int num;
 char na[10];
 char teacher[20];
 char wtime[10];
 char ttime[10];
 int score;
 struct subjects *next;
}SUB;
SUB *create_form()
{
SUB *head,*tail,*p;
int num,score;
char na[10],teacher[20],wtime[10],ttime[10];
head=tail=NULL;
printf("     输入选课程信息，以6个0结束：/n");
printf("     课程代码    课名  任教老师   上课星期    上课时间    学分/n");
scanf("%d%10s%14s%10s%8s%6d",&num,&na,&teacher,&wtime,&ttime,&score);
while(num!=0)
{
 p=(SUB*)malloc(sizeof(SUB));
 p->num;
 strcpy(p->na,na);
 strcpy(p->teacher,teacher);
 strcpy(p->wtime,wtime);
 strcpy(p->ttime,ttime);
 p->score=score;
 if(head==NULL)
 head=p;
 else
 tail->next=p;
 tail=p;
 scanf("%d%s%s%s%s%d",&num,&na,&teacher,&wtime,&ttime,&score);
}
  tail->next=NULL;
  return head;
}
void savefile(SUB*head)
{
 SUB *p;
 FILE *fp;
 fp=fopen("subjects.txt","w");
 fprintf(fp,"欢迎进入东华理工大学2008-2009学年选修课系统（4-13）/n");
 fprintf(fp,"课程代码   课名   任教老师    上课星期  上课时间   学分/n");
 for(p=head;p;p->next)
 fprintf(fp,"%6d%10s%14s%10s%8s%6d",p->num,p->na,p->teacher,p->wtime,p->ttime,p->score);
 fclose(fp);
}
void prin(SUB *head)
{
 SUB *p;
 if (head==NULL)
 {
  printf("没有选修课程记录！/n");
  return;
 }
 printf("欢迎进入东华理工大学2008-2009学年选修课系统（4-13）/n");
 printf("课程代码   课名   任教老师    上课星期  上课时间   学分/n");
 for(p=head;p;p->next)
 printf("%6d%10s%16s%12s%12s%d",p->num,p->na,p->teacher,p->wtime,p->ttime,p->score);
}
SUB *inset(SUB *head)
{
 SUB *ptr,*ptr2,*subj;
 char ch, ch1;
 printf("是否进行插入课程，如果需要插入请按回车建，不进行按空格结束！/n");
 ch=getchar();
 while(ch!=' '){
  subj=(SUB*)malloc(sizeof(SUB));
  ptr=subj;
  printf(" 输入要插入的课程信息：/n");
  scanf("%d%s%s%s%s%d",subj->num,subj->na,subj->teacher,subj->wtime,subj->ttime,subj->score);
  if(head==NULL){
   head=ptr;
   head->next=NULL;
  }
  else{
   for(ptr2=head;ptr2;ptr2=ptr2->next)
   if(ptr2->next==NULL){
    ptr2->next=subj;
    subj->next=NULL;
    break;
   }
   ch='a';
  }
  printf("继续请按回车建，结束请按空格：/n");
  ch1=getchar();
  ch=getchar();
 }
 return head;
}
SUB *del(SUB *head)
{
 SUB*p1,*p2;
 char ch,ch1;
 int num;
 printf("是否进行课程删除，要删除请按回车键，不进行请按空格：/n");
 ch=getchar();
 while(ch!=' ')
 {
  printf("输入要删除的课程代码：/n");
  scanf("%d",&num);
  if(head->num==num){
   p2=head;
   head=head->next;
   free(p2);
  }
  if(head==NULL)
  return NULL;
  p1=head;
  p2=head->next;
  while(p2!=NULL){
   if(p2->num==num){
    p1->next=p2->next;
    free(p2);
   }
   else
   p1=p2;
   p2=p1->next;
  }
  printf("继续删除请按回车键，结束请按空格：/n");
  ch1=getchar();
  ch=getchar();
 }
 return head;
}
 typedef struct student
 {
  int number;
  int classes;
  char chinesename[16];
  char  title [5][12];
  struct student *other;
 }STU;
 void scanf_form(SUB *head)
 {
  int i,count,number,classes;
  char ch,title[3][12],chinesename[16];
  scanf("%d%d%16s",&number,&classes,&chinesename);
  for(i=0;i<5;i++)
  {
   scanf("%s",&title[i]);
   count++;
   if(count==3)
   {
    ch=getchar();
    if(ch!=' ')
    {title[3][12]='0';
    title[4][12]='0';
    i=5;
    ch='a';
    }    
   }
   if(count==4)
   {
    ch=getchar();
    if(ch!=' ')
    {title[4][12]='0';
     i=5;
     ch='a';
    }
   }
   for(i=0;i<5;i++)
         {
        if(strcmp(title[i][12],head->na)!=0 && title[i][12]!='0')
       { printf("你输入的课程名不正确，请从新输入：/n");
        scanf_form();
       }
         } 
  }    
 }
 STU *study_form(SUB*head)
 {
  STU *hand,*tall,*q;
  int i;
  char ch,ch1;
  hand=tall=NULL;
  printf("输入你个人信息，及选修的课名，以4个0结束：/n");
  printf("注：每个学生至少选修3门课，大于3门时按回车键继续，空格结束：/n");
  scanf_form();
   while(number!=0)
   {
    q=(STU*)malloc(sizeof(STU));
    q->number=number;
    q->classes=classes;
    strcpy(p->chinesename,chinesename);
    for(i=0;i<5;i++)
    strcpy(p->title[i],title[i][12]);
    if(hand=NULL)
    hand=q;
    else
    tall->other=q;
    tall=q;
          scanf_form();
          for(i=0;i<5;i++)
         {
        if(strcmp(title[i][12],head->na)!=0&&titli[i][12]!='0')
       { printf("你输入的课程名不正确，请从新输入：/n");
        scanf_form();
       }
         }
         tall->other=NULL;
         return hand;
   }
 }
 void savefiles(STU*hand)
 {
  STU *q;
  FILE *fq;
  fq=fopen("studennt.txt","w");
  fprintf(fq, "学生选课信息表：/n");
  for(q=hand;q;q=q->other)
  fprintf(fq,"%16d%10d%16s%16s%16s%16s%16s%16s",q->number,q->classes,q->chinesename,q->title[0],q->title[1],q->title[2],q->title[3],q->title[4]);
  fclose(fq);
 }
 void prins(STU*hand)
 {
  STU *q;
  if(head==NULL)
  {
   printf("没有学生选课信息记录！/n");
   return;
  }
  printf("学生选课信息一览表：/n");
  printf("学号     班级    姓名    课名    ：/n");
  for(q=hand;q;q->number)
  printf("%16d%10d%16s%16s%16s%16s%16s%16s",q->number,q->classes,q->chinesename,q->title[0],q->title[1],q->title[2],q->title[3],q->title[4]);
 }
 STU *intserts(SUB*head,STU *hand)
 {
  STU *prt,*prt2,*stuj;
  int i;
  char ch,ch1;
  printf("是否要进行插入学生选课信息，如果需要请按回车建，结束请按0：/n");
  ch=getchar();
  while(ch!=' ')
  {
   stuj=(STU*)malloc(sizeof(STU));
   prt=stuj;
   printf("输入要插入的学生选课信息：/n");
   scanf_form();
   if(hand==NULL)
   {hand=prt;
    hand->other=NULL;
   }
   else
   {for(prt2=hand;prt2;prt2=prt2->other)
    if(prt2->other==NULL)
    {prt2->other=stuj;
     stuj->other=NULL;
     break;
    }
    ch='a';
   }
   printf("继续插入请按回车建，结束请按空格：/n");
   ch1=getchar();
   ch=getchar();
  }  
  return hand;
 }
 STU *dells(STU *hand)
 {
  STU *q1,*q2;
  char ch,ch1;
  int number;
  printf("是否进行学生选课信息删除，要删除请按回车建，不进行请按空格：/n");
  ch=getchar();
  while(ch!=' ')
  {
   printf("输入要删除的学号：/n");
   scanf("%d",&number);
   if(hand->number==number)
   {
   q2=hand;
   hand=hand->other;
   free(q2);
   }
   if(hand=NULL)
   return NULL;
   q1=hand;
   q2=hand->other;
   while(q2)
   {if(q2->number==number)
    {q1->other=q2->other;
     free(q2);
    }
    else
    q1=q2;
    q2=q1->other;
   }
   printf("继续删除请按回车建，结束请按空格：/n");
   ch1=getchar();
   ch1=getchar();
  }
  return hand;
 }
 void search(STU*hand)
 {
  int a,number;
  int t=1;
  char type[10],ch,ch1;
  STU *prt;
  printf("是否进入查询，按回车键进入，空格结束:/n");
  ch=getchar();
  while(ch!=' ')
  {
   printf("请输入要查询的学号：/n");
   for(prt=hand;prt;prt=prt->other)
   {
    if(number=prt->number)
   {printf("%16d%10d%16s%16s%16s%16s%16s%16s",prt->number,prt->classes,prt->chinesename,prt->title[0],prt->title[1],prt->title[2],prt->title[3],prt->title[4]);
   t=0;
  }
  if(t!=0)
  printf("未找到！/n");
  t=1;
   }
   printf("继续查找请按回车键，结束请按空格键：/n");
   ch1=getchar();
   ch=getchar();
  }
 }
void main()
{
  SUB *head=create_form()  ;
  savefile(head);
   prin(head);
  head= inset(head);
 head= del(head);
 STU *hand=study_form(head);
 savefiles(hand);
 prins(hand);
 hand=intserts(head,hand);
 hand=dells(hand);
 search(hand);
}