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

#define RANGE 52
#define BALLS 6

int getBall(void);

struct lotto {
    int ball[BALLS];
    struct lotto *previous;
    struct lotto *next;
    };
struct lotto *f,*c,*n,*p,*l;

int main()
{
	int x,y;

	srand((unsigned)time(NULL));	/* seed randomizer */

/* fill first record */
	
	f = (struct lotto *)malloc(sizeof(struct lotto));
	for(x=0;x<BALLS;x++)
		f->ball[x] = getBall();
	f->previous = NULL;
	f->next = NULL;
	c = f;

/* fill middle records */
	for(y=0;y<9;y++)
	{
		p = c;
		n = (struct lotto *)malloc(sizeof(struct lotto));
		c->next = n;
		c = n;
		for(x=0;x<BALLS;x++)
			c->ball[x] = getBall();
		c->previous = p;
	}

/* fix in the last record */
	c->next = NULL;
	l = c;
	
/* display all records forward */
	y = 1;
	for(c = f;c !=NULL;c=c->next)
	{
		printf("Lotto pix %d: ",y++);
		for(x=0;x<BALLS;x++)
			printf(" %d",c->ball[x]);
		putchar('\n');
	}
	
/* delete a record */
	printf("Enter a record to delete: ");
	scanf("%d",&y);
	for(x=1,c=f;x<y;x++)	/* find the record */
		c = c->next;
				/* c is the record */
	p = c->previous;
	n = c->next;		/* borrow n here */
	if(p != NULL)
		p->next = n;	/* update references */
	else
		f = n;		/* new first */
	if(n != NULL)
		n->previous = p;
	else
		l = p;		/* new last */
	free(c);		/* remove record */
	
/* display all records forward */
	y = 1;
	for(c = f;c !=NULL;c=c->next)
	{
		printf("Lotto pix %d: ",y++);
		for(x=0;x<BALLS;x++)
			printf(" %d",c->ball[x]);
		putchar('\n');
	}
	return(0);
}


int getBall(void)
{
	return(rand() % RANGE + 1);
}