# include <stdio.h>
# include <malloc.h>
# define LEN sizeof(struct train)
# define NULL 0

struct train  
{
    int num;
    struct train *next;
}
void print (struct train *head);
void count (struct train *head);
int main()
{
    int n=0;
    struct train *head,*p1,*p2;
    p1=p2=(struct train *) malloc(LEN);
    head=NULL;
    scanf("%d",&p1->num);
    while (p1->num !=0)
    {
        n++;
        if (n==1)
            head=p1;
        else
            p2->next=p1;
        p2=p1;
        p1=(struct train *) malloc(LEN);
        scanf("%d",&p1->num);
    }
    p2->next=NULL;
    print(head);
    count(head);
    return 0;
}

void print (struct train *head)
{
    struct train *tmp;
    tmp=head;
    if (head !=NULL)
        do
        {printf("%d ",tmp->num);
         tmp=tmp->next;
        }while (tmp !=NULL);
        printf("\n");
}

void count (struct train *head)
{
    int count=0;
    struct train *tmp;
    tmp=head;
    if (head !=NULL)
        do
        {count++;
        }while (tmp->next !=NULL);
    printf("%d\n",count);
}


编译过程提示错误：
error C2628: “train”后面接“void”是非法的(是否忘记了“;”?)
error C2556: “void print(train *)”: 重载函数与“train print(train *)”只是在返回类型上不同
error C2371: “print”: 重定义；不同的基类型
这是什么错误？

struct train  
{
    int num;
    struct train *next;
}; //记得要加一个分号

的确是少了“；”
后来发现第二个函数也有问题，正确的应该是
# include <stdio.h>
# include <malloc.h>
# define LEN sizeof(struct train)
# define NULL 0

struct train  
{
    int num;
    struct train *next;
};

void print (struct train *head);
void count (struct train *head);

int main()
{
    int n=0;
    struct train *head,*p1,*p2;
    p1=p2=(struct train *) malloc(LEN);
    head=NULL;
    scanf("%d",&p1->num);
    while (p1->num !=0)
    {
        n++;
        if (n==1)
            head=p1;
        else
            p2->next=p1;
        p2=p1;
        p1=(struct train *) malloc(LEN);
        scanf("%d",&p1->num);
    }
    p2->next=NULL;
    print(head);
    count(head);
    return 0;
}

void print (struct train *head)
{
    struct train *tmp;
    tmp=head;
    if (head !=NULL)
        do
        {printf("%d ",tmp->num);
         tmp=tmp->next;
        }while (tmp !=NULL);
        printf("\n");
}

void count (struct train *head)
{
    int count=0;
    struct train *tmp;
    tmp=head;
    if (head !=NULL)
      do
      {count++;
      tmp=tmp->next;
      }while (tmp!=NULL);
    printf("%d\n",count);
}