本蒟蒻打了一个链表插入的程序，但有一些些问题，望大佬帮改一下

# include <bits/stdc++.h>
using namespace std;

typedef struct Node {
  	int value;
  	Node* next;
}Node;

Node* App(){
	Node* node = (Node*)malloc(sizeof(Node));
	if  (node == NULL) return NULL;
	node->next = NULL;
	node->value = 0;
	return node;
}
void insertNode(Node *p, int i) {
  	Node *node = App();
  	node->value = i;
  	node->next = p->next;
 	p->next = node;
}
void Print(Node* node){
	while (node != NULL){
		printf ("%d -> ", node->value);
		node = node->next;
	}
	printf ("NULL");
}

int main (){
	
	Node* Head = App();
	int m;
	
	while (true){
		scanf ("%d", &m);
		
		if (m != -1) break;
		
		insertNode (Head, m);
	}
	
	Print (Head);
	
	return 0;
}