程序代码：

#define _STDC_WANT_LIB_EXT1_1
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>


typedef struct horse horse;
struct horse
{
    int age;
    char name[10];
    char father[10];
    char mother[10];
    horse *next;
    horse *previous;
};

int main ()
{
    horse *first=NULL;
    horse *current=NULL;
    horse *last=NULL;

    char test='\0';
    for ( ; ;)
    {
        printf("Do you want to enter details of a%s horse (Y or N)",first==NULL?"":"nother");
        scanf("%c",&test);
        if (tolower(test)=='n')
        {
            break;
        }

        current=(horse*)malloc(sizeof(horse));
        if(first==NULL)
        {
            first=current;
            current->next=NULL;
        }
        else
        {
            last->next=NULL;
            current->previous=last;
        }

        printf("Please input the name of the horse:");
        scanf("%s",current->name);
        putchar (10);
        printf("Please input the age of the horse:");
        scanf("%d",&current->age);
        putchar (10);
        printf("Please input the father of the horse:");
        scanf("%s",current->father);
        putchar (10);
        printf("please input the mother of the horse:");
        scanf("%s",current->mother);
        putchar (10);
        current->next=NULL;
        last=current;
        fflush(stdin);
    }
    putchar (10);
    while (current!=NULL)
    {
        printf("%s is %d years old,and its mother is %s,its father is %s",current->name,current->age,current->mother,current->father);
        last=current;
        current=current->previous;
        free(last);
        last=NULL;
    }
    first=NULL;
    system("pause");
    return 0;
}