Lab 01 Var 02

main.c

#include <stdio.h>

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

int filter(int);

int main(int argc, char** argv)
{
	struct llist_node* begin = NULL;
	struct llist_node* current = NULL;
	while (1)
	{
		int value;
		printf("Please, enter next number (or 0 for stop): ");
		scanf("%d", &value);

		if (value == 0)
		{
			break;
		}

		if (current == NULL)
		{
			current = malloc(sizeof(struct llist_node));
			current->value = value;
			current->next = NULL;
			begin = current;
		}
		else
		{
			current->next = malloc(sizeof(struct llist_node));
			current->next->value = value;
			current->next->next = NULL;
			current = current->next;
		}
	}

	printf("Your numbers: ");
	current = begin;
	while (current)
	{
		printf("%d ", current->value);
		current = current->next;
	}
	printf("\n");

	current = begin;
	while (current)
	{
		if (filter(current->value) && (!current->next || filter(current->next->value)))
		{
			current = current->next;
			continue;
		}

		if (!filter(current->value) && current == begin)
		{
			begin = current->next;
			free(current);
			current = begin;
			continue;
		}

		struct llist_node* temp = current->next->next;
		free(current->next);
		current->next = temp;
	}

        printf("Your numbers after operation: ");
        current = begin;
        while (current)
        {
                printf("%d ", current->value);
                current = current->next;
        }
        printf("\n");


	return 0;
}

int filter(int value)
{
	return value % 2;
}