程序代码：

#include<stdio.h>
#include<malloc.h>
typedef struct life
{
    int date;
    struct life *qian,*hou;
}LIFEO;
LIFEO * jianlilianbiao(LIFEO *KK,int n)
{
    KK=(LIFEO *)malloc(sizeof(LIFEO));
    KK->qian=NULL;
    KK->hou=NULL;
    LIFEO *p0=KK,*p;
    if(p0==NULL)
    printf("内存分配错误");
    int t;
    for(t=0;t<n;t++)
    {
        p=(LIFEO *)malloc(sizeof(LIFEO));
        printf("输入数据");
    scanf("%d",&p->date);
     p->qian=p0;
     p0->hou=p;
     p0=p;
     printf("%d\n",p0->date);
    }
    p0->hou=NULL;
    return KK;
}
void DisplayDList(LIFEO *L){

 LIFEO *p=L->hou;

 while(p!=NULL ){
  printf("%d\n",p->date);
  p=p->hou ;

 }
}
int main()
{
LIFEO *ttt;

    jianlilianbiao(ttt,5);
    DisplayDList(ttt);
}