連結リストっぽいやつ

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

struct Cell {
  struct Cell *next;
  int value;
} ;

struct Cell* head;
void free_all();

void fatal_error(){
  printf("fatal error"); 
  free_all(head);
}

struct Cell* new_Cell(int val)
{
  struct Cell* c;
  c = (struct Cell*)malloc(sizeof(struct Cell));
  if(c == NULL)
  {
    fatal_error();
  }

  c->value = val;
  return c;
}

void append(struct Cell* c, int val)
{
 if(c->next == 0){
    c->next = new_Cell(val);
    return;
 }
  struct Cell* ptr = c->next;
  while(ptr->next != 0){
    ptr = ptr->next;
  }
  ptr->next = new_Cell(val);
}

void print_all_cell ( struct Cell* c )
{
  if(c->next != NULL){
    printf("addr : %x, value : %d\n",c->next, c->value);
    print_all_cell(c->next);
  } else { 
  printf("addr : %x, value : %d\n",c->next, c->value);
  }
}


void free_all(struct Cell* c)
{
 if(c->next == NULL){
    return;
 } else {
  free_all(c->next);
  free(c);
 }
}

int main() 
{
  head = (struct Cell*)malloc(sizeof(struct Cell));
  head->value = 3;
  for(int i=0;i<100;++i){
  append(head,i);
  }

  //  printf("head points %x\n",head->next);
  print_all_cell(head);

  free_all(head);
  return 0; 
}