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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct node{
  5.     int data;
  6. 	struct node *next;
  7. };
  8.  
  9. void push(struct node** head,int n){
  10. 	struct node* new_node = (struct node*) malloc(sizeof(struct node));
  11. 	new_node->data = n;
  12. 	new_node->next = *head;
  13.  
  14. 	*head = new_node;
  15. }
  16.  
  17. void display(struct node *head){
  18. 	while(head != NULL){
  19. 		printf("%d ",head->data);
  20. 		head = head->next;
  21. 	}
  22. }
  23.  
  24. void swap(struct node *head){
  25. 	if(head == NULL || head->next == NULL)
  26. 		return;
  27.  
  28. 	struct node *temp = head,*temp1 = head->next,*ptr,*start = NULL;
  29. 	while(temp1 != NULL){
  30. 		temp->next = temp1->next;
  31. 		temp1->next = temp;
  32.  
  33. 		if(start == NULL)
  34. 			start = temp1;
  35. 		else
  36. 			ptr->next = temp1; 
  37. 		ptr = temp;	
  38.  
  39. 		temp = temp->next;
  40. 		temp1 = temp->next;
  41. 		display(start);
  42. 		//getchar();
  43. 	}
  44. }
  45.  
  46. int main(){
  47. 	struct node *start = NULL;
  48. 	struct node *head;
  49.  
  50. 	push(&start,10);
  51. 	push(&start,9);
  52. 	push(&start,8);
  53. 	push(&start,7);
  54. 	push(&start,6);
  55. 	push(&start,5);
  56. 	push(&start,4);
  57. 	push(&start,3);
  58. 	push(&start,2);
  59. 	push(&start,1);
  60. 	display(start);
  61. 	printf("\n");
  62.  
  63. 	swap(start);
  64. 	//display(start);
  65. 	//getchar();
  66. 	return 0;
  67. }
Runtime error #stdin #stdout 0s 3028KB
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https://ideone.com/oh1Kf6
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
secret

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