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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. struct node *h;
  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.    // printf("**%d**\n",temp1->data);
  30. 	while(temp != NULL&&temp1!=NULL){
  31. 		temp->next = temp1->next;
  32. 		temp1->next = temp;
  33.  
  34. 		if(start == NULL)
  35. 		{
  36.             start = temp1;
  37.             //printf("**%d**\n",start->data);
  38. 		}
  39. 		else
  40. 			ptr->next = temp1; 
  41. 		ptr = temp;	
  42.  
  43. 		temp = temp->next;
  44. 		if(temp!=NULL)
  45.             temp1 = temp->next;
  46. 		//getchar();
  47. 	}
  48.     //display(start);
  49.     h=start;
  50. }
  51.  
  52. int main(){
  53. 	struct node *start = NULL;
  54. 	struct node *head;
  55.  
  56. 	push(&start,10);
  57. 	push(&start,9);
  58. 	push(&start,8);
  59. 	push(&start,7);
  60. 	push(&start,6);
  61. 	push(&start,5);
  62. 	push(&start,4);
  63. 	push(&start,3);
  64. 	push(&start,2);
  65. 	push(&start,1);
  66. 	display(start);
  67. 	printf("\n");
  68.  
  69. 	swap(start);
  70.     start=h;
  71. 	display(start);
  72. 	//getchar();
  73. 	return 0;
  74. }
Success #stdin #stdout 0s 2984KB
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https://ideone.com/VqataS
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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