#define ERROR 0
#define OK 1

struct STU{
  char name[20];
  char stuno[10];
  int age;
  int score;
}stu[50];
struct LIST
{
  struct STU stu[50];
  int length;
}L;

int printlist(struct LIST L)
{
  int i;
  printf("name    stuno   age     score\n");
  for(i=0;i<L.length;i++)
      printf("%s %s\t%d\t%d\n",  L.stu[i].name,  L.stu[i].stuno,
	  L.stu[i].age,  L.stu[i].score);
  printf("\n");
}

int listinsert(struct LIST *L,int i,struct STU e)
{
  struct STU *p,*q;
  if (i<1||i>L->length+1) return ERROR;
  q=&(L->stu[i-1]);
  for(p=&L->stu[L->length-1];p>=q;--p)
    *(p+1)=*p;
  *q=e;
  ++L->length;
  return OK;
}/*ListInsert Before i */


main()
{
  struct STU e;
  L.length=0;

  strcpy(e.name,"zmofun");
  strcpy(e.stuno,"100001");
  e.age=80;
  e.score=1000;
  listinsert(&L,1,e);

  printlist(L);
  printf("List length now is  %d.\n\n",L.length);

  strcpy(e.name,"bobjin");
  strcpy(e.stuno,"100002");
  e.age=80;
  e.score=1000;
  listinsert(&L,1,e);

  printlist(L);
  printf("List length now is  %d.\n\n",L.length);
}