/* person.h */

typedef struct {
  int  number;
  char *lastname;
  char *firstname;
  char *phone;
} PERSON_TYPE;

#ifdef PERSON_INIT
  PERSON_TYPE **people = NULL;
  int npeople = 0;
  int lastperson = 0;
#else
  extern PERSON_TYPE **people;
  extern int npeople;
  extern int lastperson;
#endif 

void copyPerson( PERSON_TYPE *t1, PERSON_TYPE *t2 );
void readField( char **field, int max, char *prompt );
PERSON_TYPE *readPerson();
void printPerson( PERSON_TYPE *person );
void readPersonFile( char *filename );
void writePersonFile( char *filename );