c语言---学生户籍管理系统

#include "stdio.h"
#include "stdlib.h"
#include "malloc.h"
#include "string.h"
#define NULL 0
typedef  struct Link
       {    
      char XH[15];
  char Name[15];
  char Adr[30];
  struct Link *next;
   }Link;

void Creat();
int Seek1(char a[],char kxh[],int k);
void Seek2(char a[],char kname[],k);
void Seek3(char a[],char kadr[],k);
void Del(char a[],char kxh[],k);

main ()
{
    
FILE *x=fopen("D:\abc.txt","r+");
   Link a[50];
   char kxh[15],dxh[15],kname[15],kadr[30],u;
   int i=0,w,k,r;
   Creat();
   do
   {  
   fscanf(x,"%s",a[i].XH);

   fscanf(x,"%s",a[i].Name);
   fscanf(x,"%s",a[i].Adr);
   i++;
   }while(a[i-1].XH!=0)
   k=i;
   for(i=0;i<k;i++)
 {
printf("%s\t%s\t%s",a[i].XH,a[i].Name,a[i].Adr);
printf("\n");          
 
     }  
   for(;;)
   {
   printf("\t\t1------通过学号查询\n\t\t2------通过姓名查询\n\t\t3------通过籍贯查找所有该籍贯的所有学生\n\t\t4------删除学生信息\n\t\t5------添加学生信息\n\t\t6------修改学生信息");
   scanf("%d",&w);
   switch(
     {
      case 1 :
       printf("请输入学号:\n");
   gets(kxh);
   r=Seek1(a,kxh);
   printf("%s\t%s\t%s",a[r].XH,a[r].Name,a[r].Adr);
   break;
  case 2 :
       printf("请输入姓名:\n");
   gets(kname);
   Seek2(a,kname);
   break;
  case 3 :
       printf("请输入籍贯:\n");