c程序《电话簿》

#include <stdio.h>
struct person
{
  char name[50];
  char tel[50];
  char addr[50];
};
char filename[50];
FILE *fp;
int p;
void creat();
void output();
void search();
void append();
void modify();
void delete();
main()
{
char m;
creat();
while(!p)
{
  printf("------------------------");
  printf("\n Add,   please push 1 ");
  printf("\n Search,please push 2 ");
  printf("\n Modify,please push 3 ");
  printf("\n Delete,please push 4 ");
  printf("\n Output,please push 5 ");
  printf("\n Quit,  please push 0\n");
  printf("------------------------\n");

  putchar('>');
  scanf("%d",&m);
  if (((int)m)>=0&&((int)m)<=5)
  {
   switch((int)m)
   {
    case 1: append();
    break;
    case 2: search();
    break;
    case 3: modify();
    break;
    case 4: delete();
    break;
    case 5: output();
    break;
    case 0: exit(0);
   }
   printf("\nOpration end,please choose again!\n");
  }
  else
   printf("\nchoose error,please choose again!\n");
}
getch();

}
/*************************************************/
void creat()
{
struct person one;