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

struct person
{
  char name[25];
  int age;
  struct person *next;
};

void append (struct person *head);
void display(struct person *h);

int main(int argc, char *argv[])
{
	struct person * head = NULL;
	
  printf("Addy before: %u\n", head);
  append(head);
  printf("Addy after: %u\n", head);
  display(head);
	return 0;
}

void append (struct person *head)
{
  struct person *tmp, **t;
  tmp = (struct person *) malloc(sizeof(struct person));
  scanf("%s %d", tmp->name, &tmp->age);
  tmp->next = NULL;
  printf("HERE1");
  t = &head;
  printf("HERE2");

  if(*t != NULL)
  {
    printf("HERE3");
    while((*t)->next != NULL)
    {
      *t = (*t)->next;
    }
    (*t)->next = tmp;
  } else {
    printf("HERE");
    printf("tmp addy: %u\n", tmp);
    *t = tmp;
  }
}

void display(struct person *h)
{
  struct person *tmp;

  tmp = h;

  while(tmp != NULL)
  {
    printf("%s\t%i\n", tmp->name, tmp->age);
    tmp = tmp->next;
  }
}

void insert_first(struct person *head)
{
  struct person *tmp;
  tmp = (struct person *) malloc(sizeof(struct person));
  scanf("%s %d", tmp->name, &tmp->age);
  tmp->next = NULL;
  tmp->next = head;
  head = tmp;
}

void insert(struct person * head)
{
  int pos, i = 0;
  struct person *tmp, *t = head;
  scanf("%d", &pos);
  tmp = (struct person *) malloc(sizeof(struct person));
  scanf("%s %d", tmp->name, &tmp->age);
  tmp->next = NULL;
  
  while(t != NULL)
  { 
    if(pos == i)
    {
      tmp->next = t->next;
      t->next = tmp;
    }
    i ++;
    t = t->next;
  }
}

void remove_all(struct person * head)
{
  struct person * tmp = head, *h;
  
  while(tmp != NULL)
  {
    h = tmp;
    tmp = tmp->next;
    free(h);
  }

  head = NULL;
}

void removeAt(struct person *head)
{
  int pos, i = 0;
  struct person *tmp;
  scanf("%d", &pos);
  tmp = head;
  /*
  while(tmp != NULL)
  {
    if(pos == i)
    {
      
    }
  }*/
}