参数传入函数后内容改变

linknode *hash_create()
{
    int data,n = 0;
    linknode a[6];
    linknode *head,*temp,*end;

    while(n <= 5){
        a[n].next = NULL;
        a[n].info = 0;
        n++;
    }


    while(1){
label:scanf("%d",&data);
        if(data == 0)
            break;
        if(a[data%2].info == 0){
            a[data%2].elem = data;
            a[data%2].info = 1;
            goto label;
        }

        if(a[data%2].elem%2 == data%2){
            head = &a[data%2];
            end = a[data%2].next;
            temp = (linknode *)calloc(sizeof(linknode),1);
            temp->elem = data;
            head->next = temp;
            temp->next = end;
        }
    }
    return a;
}

void hash_search(linknode *op)
{
    int n;
    linknode *p;
    printf("请输入要查询的数字:");
    scanf("%d",&n);

    p = &op[n%2];
    while(p->info > 0){
        if(p->elem == n){
            printf("\n查找成功!!!!\n\n");
            return;
        }
        p = p->next;
        if(p == NULL){
            printf("\n不存在!!!!\n\n");
            return;
        }
    }
}