Question

In: Computer Science

For the following two questions you need to provide a code in C 1. Build a...

For the following two questions you need to provide a code in C 1. Build a double linked list with 5 in the first node following the instructions: Insert a node with 3 at the top of the list Insert a node with 10 at the bottom of the list Insert a node with 7 between nodes with 5 and 10 2. Start deleting nodes from the list in the following order; Delete the node with 7 Delete the node with 3 Delete the node with 10 3. Print the resulting list forward and backwards.

Solutions

Expert Solution

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>

struct node 
{
   int data;    
   struct node *next;
   struct node *prev;
};

struct node *head = NULL;

struct node *last = NULL;

struct node *current = NULL;

bool isEmpty()
{
   return head == NULL;
}

void display1() 
{

   struct node *ptr = head;    
   while(ptr != NULL) 
   {        
      printf("%d    ",ptr->data);
      ptr = ptr->next;
   }
    
}

void display2() 
{

   struct node *ptr = last;
    
   while(ptr != NULL) 
   {    
      printf("%d    ",ptr->data);  
      ptr = ptr ->prev;
   }
}

void insertFirst( int data) 
{
   struct node *link = (struct node*) malloc(sizeof(struct node));
   link->data = data;
    
   if(isEmpty()) 
   {
      last = link;
   }
   else 
   {
      head->prev = link;
   }
   link->next = head;
   head = link;
}

void insertLast( int data) 
{
   struct node *link = (struct node*) malloc(sizeof(struct node));
   link->data = data;   
   if(isEmpty()) 
   {
      last = link;
   } 
   else 
   {
      last->next = link;     
      link->prev = last;
   }
   last = link;
}

struct node* deleteFirst() 
{
   struct node *tempLink = head;   
   if(head->next == NULL)
   {
      last = NULL;
   } 
   else 
   {
      head->next->prev = NULL;
   } 
   head = head->next;
   return tempLink;
}

struct node* deleteLast() 
{ 
   struct node *tempLink = last;   
   if(head->next == NULL) 
   {
      head = NULL;
   } 
   else 
   {
      last->prev->next = NULL;
   } 
   last = last->prev;
   return tempLink;
}

struct node* delete(int key) 
{
   struct node* current = head;
   struct node* previous = NULL;   
   if(head == NULL) 
   {
      return NULL;
   }
   while(current->data != key) 
   {     
      if(current->next == NULL) 
      {
         return NULL;
      } 
      else 
      {
         previous = current;
         current = current->next;             
      }
   }
   if(current == head) 
   {
      head = head->next;
   } 
   else 
   {
      current->prev->next = current->next;
   }    
   if(current == last) 
   {
      last = current->prev;
   } 
   else 
   {
      current->next->prev = current->prev;
   } 
   return current;
}

bool insertAfter(int data, int key) 
{   
   struct node *current = head;    
   if(head == NULL) 
   {
      return false;
   }
   while(current->data != key) 
   { 
      if(current->next == NULL) 
      {
         return false;
      } 
      else 
      {           
         current = current->next;
      }
   }

   struct node *newLink = (struct node*) malloc(sizeof(struct node));
   newLink->data = data;

   if(current == last) 
   {
      newLink->next = NULL; 
      last = newLink; 
   } 
   else 
   {
      newLink->next = current->next;         
      current->next->prev = newLink;
   } 
   newLink->prev = current; 
   current->next = newLink; 
   return true; 
}

int main() 
{
   insertFirst(5);
   /*display1();
   printf("\n");
   display2();
   printf("\n");*/
   insertFirst(3);
   /*display1();
   printf("\n");
   display2();
   printf("\n");*/
   insertLast(10);
   /*display1();
   printf("\n");
   display2();
   printf("\n");*/
   insertAfter(7,5);
   /*display1();
   printf("\n");
   display2();
   printf("\n");*/
   delete(7);
   /*display1();
   printf("\n");
   display2();
   printf("\n");*/
   delete(3);
   /*display1();
   printf("\n");
   display2();
   printf("\n");*/
   delete(10);
   display1();
   printf("\n");
   display2();
}

Stepwise output of code:

Desired output:


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