求助有关链表的问题 输出的时候多了一个零

#define _CRT_SECURE_NO_WARNINGS
#include "stdio.h"
#include "stdlib.h"
#include "string.h"

typedef struct Node
{
    int data;
    struct Node* next;
}SLIST;

SLIST* List_Create();
int List_Print(SLIST* pHead);

SLIST* List_Create()
{
    int num = 0;
    SLIST* pHead = NULL;
    SLIST* pCur = NULL;
    while (num != -1)
    {
        SLIST* pM = (SLIST*)malloc(sizeof(SLIST));
        pM->data = num;
        pM->next = NULL;
        if (pHead == NULL)
        {
            pHead = pCur = pM;
        }
        else
        {
            pCur->next = pM;
            pCur = pM;
        }
        printf("请输入num的值:");
        scanf("%d", &num);
    }
    printf("num的值为-1,存值结束");
    return pHead;
}

void main()
{
    SLIST* pHead = NULL;
    pHead = List_Create();

    List_Print(pHead);
    system("pause");
}

int List_Print(SLIST* pHead)
{
    SLIST* p = NULL;
    for (p = pHead; p; p = p->next)
    {
        printf("%d ", p->data);
    }
    printf("\n");
}