/* Program 11.6 Basics of a family tree */
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>

struct Family *get_person(void);

struct Date
{
    int day;
    int month;
    int year;
};

struct Family
{
    struct Date dob;
    char name[20];
    char father[20];
    char mother[20];
    struct Family *next;
    struct Family *previous;
};

int main(void)
{
    struct Family *first = NULL; /*第一个*/
    struct Family *current = NULL; /*当前*/
    struct family *last = NULL; /*最后一个*/
    char more = '\0';

  for( ; ;)
    {
        printf("\nDo you want to enter details of a%s person (Y or N)? ",
               first != NULL?"nother " : "");
        scanf(" %c", &more );
        if(tolower(more) == 'n')
            break;

        current = get_person();

        if(first == NULL) /*只在第一次输入执行*/
        {
            first = current;
            last = current;
        }
        else
        {
            last->next = current;
            current->previous = last;
            last = current;
        }
    }

    while(current != NULL) /*链表输出*/
    {
        printf("\n%s was born %d%d%d, and has %s and %s as parents.",
               current->name, current->dob.day, current->dob.month,
               current->dob.year, current->father, current->mother);
        last = current;
        current = current->previous;
        free(last);
    }
    return 0;
}

struct Family *get_person(void)/*读取输入*/
{
    struct Family *temp;

    temp = (struct Family*) malloc(sizeof(struct Family));

      printf("\nEnter the name of the person: ");
        scanf("%s", temp -> name);

        printf("\nEnter %s's date of birth (day month year); ", temp-> name);
        scanf("%d %d %d", &temp -> dob.day, &temp->dob.month, &temp->dob.year);

        printf("\nWho id %s's father? ", temp  -> name);
        scanf("%s", temp -> father);

        printf("\nWho is %s's mother? ", temp  -> name);
        scanf("%s", temp -> mother);

        temp->next = temp->previous = NULL;

        return temp;

}

书中示例，为了演示返回结构指针
编译提示 ：49 error: dereferencing pointer to incomplete type 'struct family'|

请问是哪里出错了？

预谢！

[此贴子已经被作者于2019-5-19 16:49编辑过]