PTA: Reverse data to establish the list (20 points) (c language version)

This problem required to achieve a function, a list in reverse order of the input data.

Function interface definition:
struct ListNode createList * ();

Createlist function scanf acquired using input from a series of positive integers, it indicates the end of input when read -1. Establishing a list in reverse order of the input data, and return the list head pointer. List node structure is defined as follows:

struct ListNode {
int data;
struct ListNode *next;
};

Referee test sample program:
#include <stdio.h>
#include <stdlib.h>

struct ListNode {
int data;
struct ListNode *next;
};

struct ListNode *createlist();

int main()
{
struct ListNode *p, *head = NULL;

head = createlist();
for ( p = head; p != NULL; p = p->next )
    printf("%d ", p->data);
printf("\n");

return 0;

}

/ * Your code will be embedded here * /

Sample input:
1234567-1

Output Sample:
7654321

struct ListNode *createlist()
{
	struct ListNode *head, *p;
	int temp;
	
	head = (struct ListNode*)malloc(sizeof(struct ListNode));
	head->next = NULL;   // 如果不初始化指向任意地方 
	scanf("%d", &temp);
	while (temp != -1)
	{
		p = (struct ListNode*)malloc(sizeof(struct ListNode));
		p->data = temp;
		p->next = head->next;
		head->next = p;
		scanf("%d", &temp);
	}
	
	return head->next; 
}