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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. typedef struct node {
  5.   int data;
  6.   node *next;
  7.   node *prev;
  8. };
  9.  
  10. void printList(node *temp);
  11.  
  12. int main()
  13. {
  14. 	node *head;
  15. 	head = new node;
  16. 	head->prev = NULL;
  17. 	node *next = head;
  18. 	node *prev = head;
  19. 	node *temp = head;
  20. 	node *current = head;
  21.  
  22.  
  23. 	//creates 100 nodes, last one points to next
  24. 	for(int x = 0; x<100; x++)
  25. 	{
  26. 	temp->data = x;
  27. 	current = temp;
  28. 	temp = new node;
  29. 	current->next = temp;
  30. 	temp->prev = current;
  31. 	temp->next = NULL;
  32. 	}
  33. 	//=========================================
  34.  
  35.  
  36. 	printList(head);
  37.  
  38. 	//=========== set everything to head ===========
  39. 	current = head;
  40. 	prev = head;
  41.  
  42.  
  43.  
  44. 	//============= reverses linked list ============
  45. 	for(int i = 0; i<50; i++)
  46. 	{	
  47. 	next = current->next;	//moves next pointer to next node
  48. 	current->prev = next;	//points current's previous to next node
  49.  
  50. 	current = next;			//set current pointer to next node
  51. 	cout<<current->data;
  52. 	current->next = prev;	//set current's next to previous node
  53. 	prev = current;			//move prev node up to current
  54. 	}
  55.  
  56. 	cout<<"done";
  57.  
  58. 	return 0;
  59. }
  60.  
  61.  
  62.  
  63. void printList(node *temp)
  64. {
  65. 	while(temp->next != NULL)
  66. 	{
  67. 		cout<<temp->data<<'\n';
  68. 		temp = temp->next;
  69. 	}
  70. }
  71.  
Success #stdin #stdout 0s 3428KB
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10101010101010101010101010101010101010101010101010done
https://ideone.com/nvDNK2
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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