#include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
#include<string.h>
#include<stdbool.h>
struct Family *get_person(void);
bool related(struct Family *pmember1,struct Family *pmember2);
bool set_ancestry(struct Family *pmember1,struct Family *pmember2);
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;
    struct Family *p_to_ma;
    struct Family *p_to_pa;
};
int main(void)
{
    struct Family *first=NULL;
    struct Family *current=NULL;
    struct Family *last=NULL;
    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)
        {
            first=current;
            last=current;
        }
        else
        {
            (*last).next=current;
            (*current).previous=last;
            last=current;
        }
    }
    current=first;
    while((*current).next!=NULL)
    {
        int parents=0;
        last=(*current).next;
        while(last!=NULL)
        {
            if(related(current,last))
             if(++parents==2)
              break;
            last=(*last).next;
        }
        current=(*current).next;
    }
    current=first;
    while(current!=NULL)
    {
        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);
        if((*current).p_to_pa!=NULL)
         printf("\n%s's birth date is %d/%d/%d",
                current->father,(*((*current).p_to_pa)).dob.day,
                (*((*current).p_to_pa)).dob.month,
                (*((*current).p_to_pa)).dob.year);
        if((*current).p_to_ma!=NULL)
         printf("and %s's birth date is %d/%d/%d.\n",
                current->mother,(*((*current).p_to_ma)).dob.day,
                (*((*current).p_to_ma)).dob.month,
                (*((*current).p_to_ma)).dob.year);
        current=(*current).next;
    }
    current=first;
    while(current!=NULL)
    {
        last=current;
        current=(*current).next;
        free(last);
    }
    return 0;
}
struct Family *get_person(void)
{
    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 is %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=(*temp).p_to_ma=(*temp).p_to_pa=NULL;
    return temp;
}
bool set_ancestry(struct Family *pmember1,struct Family *pmember2)
{
    if(strcmp((*pmember1).father,(*pmember2).name)==0)
    {
        (*pmember1).p_to_pa=pmember2;
        return true;
    }
    if(strcmp((*pmember1).mother,(*pmember2).name)==0)
    {
        (*pmember1).p_to_ma=pmember2;
        return true;
    }
    else
     return false;
}
bool related(struct Family *pmember1,struct Family *pmember2)
{
    return set_ancestry(pmember1,pmember2)||
     set_ancestry(pmember1,pmember2);
}
set_ancestry（）函数没有错误~~求指点~~

current=first;
     while((*current).next!=NULL)
     {
         int parents=0;
         last=(*current).next;
         while(last!=NULL)
         {
             if(related(current,last))
              if(++parents==2)
               break;
             last=(*last).next;
         }
         current=(*current).next;
     }
这段代码能把两个人的关系复制到~~struct Family *p_to_pa或者struct Family *p_to_ma中么~~就是求显示~~

求大神指个方向~~是不是函数作用域的问题？

谢谢~~