#include<stdio.h>
#include<stdlib.h>
typedef struct dlist
{
int data;
struct dlist *next, *prev;
}dlist;
dlist* insert_begin(dlist *h,int d)
{
dlist *temp = (dlist*)malloc(sizeof(dlist));
temp->data = d;
temp->next = temp->prev= NULL;
if(h==NULL)
{
h=temp;
// t=temp;
}
else
{
temp->next = h;
h->prev = temp;
h = temp;
}
return h;
}
dlist* delete_begin(dlist *h)
{
dlist *r = h;
if(r==NULL)
{
printf("empty list");
return 0;
}
else
{
dlist *ptr = r;
//ptr = r;
r=r->next;
r->prev = NULL;
free(ptr);
}
return r;
}
dlist* delete_end(dlist *h)
{
dlist *r = h;
if(r==NULL)
{
printf("empty list");
return 0;
}
else
{
while(r->next)
r=r->next;
dlist *p = r;
(r->prev)->next= NULL;
free(p);
return r;
}
//return r;
}
void display(dlist *h)
{
dlist *r = h;
// printf("%d",r->data);
//printf("ajay");
while(r)
{
printf("%d ---- >",r->data);
r=r->next;
}
}
void main()
{
dlist *d=NULL;
d = insert_begin(d,2);
d= insert_begin(d,3);
d= insert_begin(d,4);
d= insert_begin(d,5);
display(d);
d = delete_begin(d);
printf("After deletion1");
display(d);
d= delete_end(d);
printf("After deletion2");
display(d); // infinite elements are displaying on screen
}
上面是我編寫的用於在雙鏈表中插入和刪除元素的代碼。我從插入部分和從開始刪除節點,都工作得很好。我在delete_end()函數中遇到問題。 當我編譯並運行代碼時,它會不斷在屏幕上打印。需要幫忙。插入和刪除雙鏈表中的元素
你delete_end()函數沒有真正意義。你有'h','r'和'p',它們都指向相同的東西。你創建'p',不做任何事情,然後'free()'它。 – mhodges