哪里出问题了？一直解不开

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

typedef int BOOL;

typedef struct bookinfo

{
    char number[15];/*产品编号*/
    char name[30];/*产品名称*/
    float price;/*单价*/
    char auther[20];/*作者*/
    BOOL isExit;/*存在状态*/
    char lendername[20];/*借书人姓名*/
    char lendersex[2];/*借书人性别*/
    char lendernum[15];/*借书人学号*/
}BOOKINFO;
int main()
{
 int c1=0,c2,c3;
 int l,x,z;
 while(1)
 {
  printf("\t\t\t ^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^ \n");
  printf("\t\t\t| * - * - * -河工大图书管理系统 * - * - * |\n");
  printf("\t\t\t*  [1]   用户登录                   *\n");
  printf("\t\t\t*  [2]   管理员登录                 *\n");
  printf("\t\t\t^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^*^ \n");
  printf("\n");
  printf("请选择你的操作 ：");
  scanf("%d",&c1);
  system("cls");
  break;
 }
 if(c1==2)
while(2)
{
    getchar();
    printf("\n\n\n\n\n\n\n");
    printf("\t\t\t河工大图书管理系统\n");
    printf("\t\t\t1:新进图书基本信息的输入\n");
    printf("\t\t\t2:显示全部记录\n");
    printf("\t\t\t3:根据图书名称查询图书基本信息\n");
    printf("\t\t\t4:根据图书名称对撤销的图书信息进行删除\n");
    printf("\t\t\t5:退出\n");
    }
    {

void choice_1_input_new()/*输入新进的图书信息*/
{
    char choice;
    FILE *p;
    BOOKINFO newbook;

    system("cls");
    while(1)
      {
      printf("输入图书编号:");
      gets(newbook.number);

      printf("输入图书名称:");
      gets(newbook.name);

      printf("输入图书单价:");
      scanf("%f",&newbook.price);
      while(getchar()!='\n');

      printf("输入图书的作者:");
      gets(newbook.auther);

      printf("输入借书人姓名:");
      gets(newbook.lendername);

      printf("输入借书人性别:");
      gets(newbook.lendersex);

      printf("输入借书人学号:");
      gets(newbook.lendernum);

      printf("是否保存该条书目?(Y/N)\n");
      choice=getch();
      while(choice!='Y'&&choice!='y'&&choice!='N'&&choice!='n')
        choice=getch();
      if(choice=='Y'||choice=='y')
        {
        newbook.isExit=1;/*将图书状态设置成1，表示没有借出*/

        p=fopen("c:\\bookinfo.data","ab");
        fwrite(&newbook,sizeof(BOOKINFO),1,p);
        fclose(p);

        printf("\n该条书目已添加到c:\\bookinfo.data文件中!\n");
        }
      else
        {
        printf("\n本条书目未保存!\n");
        }
      printf("\n是否继续添加书目?(Y/N)\n");
      choice=getch();
      while(choice!='Y'&&choice!='y'&&choice!='N'&&choice!='n')
        choice=getch();
      if(choice=='Y'||choice=='y')
        continue;
      else
        break;
      }
    }
void choice_2_display_all()/*显示全部图书信息*/
{
    FILE *p;
    int n;
    BOOKINFO bookinfo[100];
    int booknumber=0;

    system("cls");
    p=fopen("c:\\bookinfo.data","rb");
    while(!feof(p))
      {
      fread(&bookinfo[booknumber],sizeof(BOOKINFO),1,p);
      booknumber++;
      }
    /*booknumber--;使用feof()函数会多读一行，因此需要booknumber自减一次，使书目的数量正确*/
    fclose(p);
    booknumber--;
    if(booknumber==0)
      {
      printf("没有任何图书信息!\n\n");
      }
    else
      {
      n=0;
      printf("                              图书信息如下\n");
      printf("                   图书信息                |         借书人信息   \n");
      printf("编号  名称        单价    作者    图书状态 | 姓名        性别    学号\n");
      while(n<booknumber)
        {
        printf("%-6s%-12s%-8.1f%-8s%-9d| %-12s%-8s%-8s\n",
                                        bookinfo[n].number,bookinfo[n].name,bookinfo[n].price,
                                        bookinfo[n].auther,bookinfo[n].isExit,bookinfo[n].lendername,
                                        bookinfo[n].lendersex,bookinfo[n].lendernum);
        n++;
        }
      }
    printf("\n\n按任意键回到主菜单!\n");
    getch();
}

void choice_3_search_according_name()/*根据图书名称显示图书的信息*/
{
    char search[20]="";/*search用来存放要查询的书名*/
    int n;
    FILE *p;
    char choice;
    BOOKINFO bookinfo[100];
    int booknumber=0;

    system("cls");
    p=fopen("c:\\bookinfo.data","rb");
    while(!feof(p))
      {
      fread(&bookinfo[booknumber],sizeof(BOOKINFO),1,p);
      booknumber++;
      }
    booknumber--;/*使用feof()函数会多读一行，因此需要booknumber自减一次，使书目的数量正确*/
    fclose(p);
    while(1)
    {
    printf("输入要查询的书本名称:");
    gets(search);
    if(booknumber==0)
      {
      printf("书库中没有任何信息!\n\n");
      printf("按任意键回到主菜单!\n\n");
      getch();
      break;
      }/*if结束*/
    else
      {
      for(n=0;n<booknumber;n++)
        if(strcmp(bookinfo[n].name,search)==0)
          {
          printf("该书的详细信息如下:\n");
          printf("                   图书信息                |         借书人信息   \n");
          printf("编号  名称        单价    作者    图书状态 | 姓名        性别    学号\n");
          printf("%-6s%-12s%-8.1f%-8s%-9d| %-12s%-8s%-8s\n",
                                        bookinfo[n].number,bookinfo[n].name,bookinfo[n].price,
                                        bookinfo[n].auther,bookinfo[n].isExit,bookinfo[n].lendername,
                                        bookinfo[n].lendersex,bookinfo[n].lendernum);
          break;
          }
      if(n>=booknumber)
        printf("没有查找该书的任何信息!\n");
      printf("\n\n是否继续查询?(Y/N)\n");
      choice=getch();
 while(choice!='Y'&&choice!='y'&&choice!='N'&&choice!='n')
         choice=getch();
      if(choice=='Y'||choice=='y')
        continue;
      else
        break;
        }/*else结束*/
      }/*while(1)结束*/
    }
void choice_4_delete_according_name()/*根据图书名称对图书信息进行删除*/
{
    char search[20]="";/*search用来存放要删除的书名*/
    int n,i;
    FILE *p;
    char choice;
    BOOKINFO bookinfo[100];
    int booknumber;

    system("cls");
    while(1)
      {
      printf("输入要删除的书本名称:");
      gets(search);
      p=fopen("c:\\bookinfo.data","rb");
      booknumber=0;
      while(!feof(p))
        {
        fread(&bookinfo[booknumber],sizeof(BOOKINFO),1,p);
        booknumber++;
        }
      booknumber--;/*使用feof()函数会多读一行，因此需要booknumber自减一次，使书目的数量正确*/
      fclose(p);
      if(booknumber==0)
        {
        printf("书库中没有任何信息!\n\n");
        printf("按任意键回到主菜单!\n\n");
        getch();
        break;
        }/*if结束*/
      else
        {
        for(n=0;n<booknumber;n++)
          if(strcmp(bookinfo[n].name,search)==0)
            {
            break;
            }
        if(n>=booknumber)
           printf("没有查找该书的任何信息!\n");
        else
           {
           printf("是否确认需要删除该条书目?(Y/N)");
           choice=getch();
             while(choice!='Y'&&choice!='y'&&choice!='N'&&choice!='n')
             choice=getch();
           if(choice=='Y'||choice=='y')
             {
             for(i=n;i<booknumber-1;i++)
               bookinfo[i]=bookinfo[i+1];
             booknumber--;

             p=fopen("c:\\bookinfo.data","wb");
             for(n=0;n<booknumber;n++)
               fwrite(&bookinfo[n],sizeof(BOOKINFO),1,p);
             fclose(p);

             printf("删除成功!\n");
             }
           else
              printf("\n\n该条书目没有被删除!");
           }
         printf("\n\n是否继续进行删除操作?(Y/N)\n");
         choice=getch();
         while(choice!='Y'&&choice!='y'&&choice!='N'&&choice!='n')
           choice=getch();
         if(choice=='Y'||choice=='y')
           continue;
         else
           break;
        }/*else结束*/
      }/*while(1)结束*/
    }

void main()
{
    char choice;
    clock_t tm;
    FILE *p;
    if((p=fopen("c:\\bookinfo.data","rb"))==NULL)
      {
      p=fopen("c:\\bookinfo.data","wb");
      fclose(p);
      }
    while(1)
      {
      system("cls");
      menu();
      choice=getch();

switch(choice)
        {
        case '1':choice_1_input_new();break;/*输入新进的图书信息*/
        case '2':choice_2_display_all();break;/*显示全部图书信息*/
        case '3':choice_3_search_according_name();break;/*根据图书名称显示图书的信息*/
        case '4':choice_4_delete_according_name();break;/*根据图书名称对图书信息进行删除*/
        case '5':printf("\n\n\t\t\t谢谢使用,再见!\n\t\t\t按任意键退出!\n");getch();return;
        default:
                printf("\n\n\t\t\t请输入菜单中的数字!(1~5)");
                tm=clock();
                while(clock()<tm+1800);
                break;
        }
      }

}}}