extern int printf(const char *,...);

int heapsize;
#if 1
#define CHECK_HEAP(b) ({int _k=(int)(b);if(_k>heapsize||_k<=0)error(-1);_k;})
#else
#define CHECK_HEAP(b)  (b)
#endif

#define car(e) (heap[(int)(CHECK_HEAP(e))])

#define cadr(e) (heap[((int)(CHECK_HEAP(e)))+1])

#define caddr(e) (heap[((int)(CHECK_HEAP(e)))+2])

#define cadddr(e) (heap[((int)(CHECK_HEAP(e)))+3])

#define caddddr(e) (heap[((int)(CHECK_HEAP(e)))+4])

#define HEAP_SIZE (1024)

#if 0
int heap0[HEAP_SIZE];
int *heap = heap0;
#else
int heap[HEAP_SIZE];
#endif

int v;

void
error(int v)
{
    printf("#0033:error %d\n",v);
}

int
main()
{
    int j;

    heapsize = HEAP_SIZE;

    for(j=1;j<5;j++)
	caddr(j) = j;
    v = 5;

    for(j=0;j<5;j++)
	printf("#0048:%d\n",caddr(j));

    for(j=1,v=5;j<5;j++,v++)
	caddr(v) = cadr(j);

    for(j=5;j<=v;j++)
	printf("#0054:%d\n",caddr(j));

    caddr(HEAP_SIZE+5);

}