[c++] 구조체 포인터 node 관리 - delete

  
#include<stdio.h>
#include<stdlib.h>
struct node
{
	int data;
	struct node *next;
};
struct node *create2();
struct node *node_del(struct node *head, int del);
void list_print(struct node *);
void main()
{
	struct node a, b, c;
	struct node *head;
	head=&a;
	a.data = 10;
	b.data = 20;
	c.data = 30;
	a.next= &b;
	b.next = &c; 
	c.next = NULL;
	list_print(head);

	head = node_del(head,10);
	list_print(head);

	head = node_del(head,20);
	list_print(head);

	head = node_del(head,30);
	list_print(head);
}
void list_print(struct node *head)
{
	int i=0;
	for(; head; head=head->next)
	{
		printf(" [%d] %d\n",i, head->data);
		i++;
	}
}
struct node *node_del(struct node *head, int del)
{
	struct node *tmp, *ptr;
	tmp = ptr = head;
	if(ptr->data==del)
	{
		head=ptr->next;
		printf("\ndel %d\n",*ptr);
		return head;
	}
	while(ptr->data != del)
	{
		tmp = ptr;
		ptr = ptr->next;
		printf("\ndel %d\n",*ptr);
	}
	tmp->next = ptr->next;
	return head;
}