[c++] 구조체 포인터 node 관리 - add

  
#include<stdio.h>
#include<stdlib.h>
struct node
{
	int data;
	struct node *next;
};
struct node *node_add(struct node *head, int add_data);
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_add(head, 50);
	list_print(head);


}
void list_print(struct node *head){ 
	for(; head; head=head->next)
	printf(" %d\n", head->data);
}
struct node *node_add(struct node *head, int add_data)
{
	struct node *ptr,*tmp,*newnode;
	newnode=(struct node *)malloc(sizeof(struct node));
	newnode->data = add_data;
	newnode->next = NULL;
	printf("맨 뒤에 %d 추가\n",add_data);
	ptr = tmp = head;	
	while(ptr)
	{
		tmp = ptr;
		ptr = ptr->next;
	}
	tmp->next=newnode;	
	return head;
}