c 데이터 구조 - 링크 추가 + 삭제 + 반전

#include "stdafx.h"
#include "malloc.h"


int _tmain(int argc, _TCHAR* argv[])
{
	return 0;
}


struct Node{
	int value;
	struct Node* next=NULL; 
}


head=null;


void delete(int number){
	Node* p1=head;
	if(p1->value==number){
		head=p1->next;
		p1->next=null;
		free(p1);
	}
	else{
		Node* p2=p1->next;
		while(p2!=null){
			if(p2->value==number){
				p1->next=p2->next;
				p2-next=null;
				free(p2);
				p2=p1-next;
			}
			else{
				p1=p2;
				p2=p2->next;
			}
		}
	}
}
void preadd(int number){
	Node* p1=head;
	if(p1->value==number){
		head=(Node)malloc(sizeof(Node));
		head->next=p1}
	else{
		Node*p2=p1->next;
		while(p2!=null){
			if(p2->value==number){
				p1->next=(Node)malloc(sizeof(Node));
				p1=p1->next;
				p1->next=p2;
				p1=p2;
				p2=p2->next;
			}
			p1=p2;
			p2=p2->next;
		}
	}
}

void reverse(){
	Node*p1=head;
	p2=p1->next;
	p3=p2->next;
	while(p3!=null){
		p1->next=null;
		p2->next=p1;
		p2=p3;
		p1=p2;
		p3=p3->next;
	}
      p2->next=p1;
	  head=p2;
}