2-add_dnodeint.c

0x17-doubly_linked_lists/2-add_dnodeint.c

@@ -0,0 +1,38 @@
+#include "lists.h"
+
+/**
+ * add_dnodeint - adds a new node at the beginning
+ * of a dlistint_t list
+ *
+ * @head: head of the list
+ * @n: value of the element
+ * Return: the address of the new element
+ */
+dlistint_t *add_dnodeint(dlistint_t **head, const int n)
+{
+	dlistint_t *new;
+	dlistint_t *h;
+
+	new = malloc(sizeof(dlistint_t));
+	if (new == NULL)
+		return (NULL);
+
+	new->n = n;
+	new->prev = NULL;
+	h = *head;
+
+	if (h != NULL)
+	{
+		while (h->prev != NULL)
+			h = h->prev;
+	}
+
+	new->next = h;
+
+	if (h != NULL)
+		h->prev = new;
+
+	*head = new;
+
+	return (new);
+}

0x17-doubly_linked_lists/2-main.c

@@ -0,0 +1,26 @@
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include "lists.h"
+
+/**
+ * main - check the code
+ *
+ * Return: Always EXIT_SUCCESS.
+ */
+int main(void)
+{
+    dlistint_t *head;
+
+    head = NULL;
+    add_dnodeint(&head, 0);
+    add_dnodeint(&head, 1);
+    add_dnodeint(&head, 2);
+    add_dnodeint(&head, 3);
+    add_dnodeint(&head, 4);
+    add_dnodeint(&head, 98);
+    add_dnodeint(&head, 402);
+    add_dnodeint(&head, 1024);
+    print_dlistint(head);
+    return (EXIT_SUCCESS);
+}