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doublylink.c
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133 lines (122 loc) · 2.07 KB
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#include<stdio.h>
#include<stdlib.h>
struct node
{
int data;
struct node *prev;
struct node *next;
}*top;
typedef struct node node;
node *create(int num)
{
node *temp= ( node*) malloc(sizeof(node));
if(temp==NULL)
return NULL;
else
{
temp->data=num;
temp->prev=NULL;
temp->next=NULL;
return temp;
}
}
void finsert(node *ptr)
{
if(top==NULL)
top=ptr;
else
{
top->prev=ptr;
ptr->next=top;
top=ptr;
}
}
void einsert(node *ptr)
{
if(top==NULL)
top=ptr;
else
{
node* temp=top;
while(temp->next!=NULL)
{
temp=temp->next;
}
temp->next=ptr;
ptr->prev=temp;
}
}
void ainsert(node *ptr,int pos)
{
int i;
if(top==NULL)
top=ptr;
else
{
node *temp=top;
for(i=0;i<pos-1;i++)
temp=temp->next;
ptr->prev=temp;
ptr->next=temp->next;
temp->next->prev=ptr;
temp->next=ptr;
}
}
void fdelete()
{
if(top==NULL)
printf("Underflow");
else
{
top=top->next;
top->prev=NULL;
}
}
void edelete()
{
if(top==NULL)
printf("Underflow");
else
{
node*temp=top;
while(temp->next->next!=NULL)
{
temp=temp->next;
}
temp->next=NULL;
}
}
void adelete(int pos)
{
int i;
if(top==NULL)
printf("Underflow");
else
{
node*temp=top;
for(i=0;i<pos-1;i++)
temp=temp->next;
temp->prev->next=temp->next;
temp->next->prev=temp->prev;
}
}
int main()
{
int a=10;
node *ptr=create(a);
finsert(ptr);
ptr=create(30);
einsert(ptr);
ptr=create(20);
ainsert(ptr,1);
//fdelete();
//edelete();
adelete(2);
node*temp=top;
while(temp!=NULL)
{
printf("%d -> ",temp->data);
temp=temp->next;
}
return 0;
}