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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. typedef struct node{
  4. 	int data;
  5. 	struct node *nxt;
  6. }node;
  7.  
  8. node* createNode(int data){
  9. 	node *tmp=(node*)malloc(sizeof(node));
  10. 	tmp->data=data;
  11. 	tmp->nxt=NULL;
  12. 	return tmp;
  13. }
  14. node* addHead(node * head, int data){
  15. 	if(!head)
  16. 	return head=createNode(data);
  17. 	node *tmp=createNode(data);
  18. 	tmp->nxt=head;
  19. 	return head=tmp;
  20. }
  21. node *addTail(node*head, int data){
  22. 	if(!head)
  23. 		return head=createNode(data);
  24. 	node*tmp=head;
  25. 	while(tmp->nxt)
  26. 		tmp=tmp->nxt;
  27. 	tmp->nxt=createNode(data);
  28. 	return head;
  29. }
  30. node* addBefore(node* head, int x, int data){
  31. 	if(!head)
  32. 		return head;
  33. 	if(head->data==x){
  34. 		node*tmp=createNode(data);
  35. 		tmp->nxt=head;
  36. 		return head=tmp;
  37. 	}
  38. 	node*tmp=head;
  39. 	while(tmp->nxt && tmp->nxt->data!=x)
  40. 		tmp=tmp->nxt;
  41. 	if(tmp->nxt)
  42. 	{
  43. 		node* tmp2=createNode(data);
  44. 		tmp2->nxt=tmp->nxt;
  45. 		tmp->nxt=tmp2;
  46. 	}
  47. 	return head;
  48.  
  49. }
  50.  
  51. node* deleteNode(node* head, int x){
  52. 	if(!head)
  53. 		return head;
  54. 	node *tmp=head;
  55. 	if (head->data==x)
  56. 	{
  57. 		head=head->nxt;
  58. 		free(tmp);
  59. 		return head;
  60. 	}
  61. 	while(tmp->nxt && tmp->nxt->data!=x)
  62. 		tmp=tmp->nxt;
  63. 	if(tmp->nxt)
  64. 	{
  65. 		node* tmp2=tmp->nxt;
  66. 		tmp->nxt=tmp2->nxt;
  67. 		free(tmp2);
  68. 	}
  69. 	return head;
  70. }
  71. void display(node * head){
  72. 	node *tmp=head;
  73. 	while(tmp){
  74. 		printf("%d\t", tmp->data);
  75. 		tmp=tmp->nxt;
  76. 	}
  77. }
  78. int nbElemets(node *head){
  79. 	int nb=0;
  80. 	node *tmp=head;
  81. 	while(tmp){
  82. 		nb++;
  83. 		tmp=tmp->nxt;
  84. 	}
  85. 	return nb;
  86. }
  87. node* nthElement(node *head, int n){
  88. 	if(nbElemets(head)<n||n<=0)
  89. 		return NULL;
  90. 	node* p1, *p2;
  91. 	p1=p2=head;
  92. 	while(n){
  93. 		p1=p1->nxt;
  94. 		n--;
  95. 	}
  96. 	while(p1){
  97. 		p1=p1->nxt;
  98. 		p2=p2->nxt;
  99. 	}
  100. 	return p2;
  101. }
  102. node * deleteLast(node *head, int x){
  103. 	node * tmp=head;
  104. 	node *cur=NULL;
  105. 	node *el =NULL;
  106. 	if(!head)
  107. 		return head;
  108. 	while(tmp){
  109. 		if(tmp->data==x){
  110. 			cur=tmp;
  111. 		}
  112. 		tmp=tmp->nxt;
  113. 	}
  114. 	if(!cur)
  115. 		return head;
  116. 	if(cur==head)
  117. 	{
  118. 		head=head->nxt;
  119. 		free(cur);
  120. 		return head;
  121. 	}
  122. 	tmp=head;
  123. 	while(tmp->nxt!=cur){
  124. 		tmp=tmp->nxt;
  125. 	}
  126. 	el=tmp->nxt;
  127. 	tmp->nxt=el->nxt;
  128. 	free(el);
  129. 	return head;
  130.  
  131. }
  132.  
  133. int main(int argc, char const *argv[])
  134. {
  135. 	int n=10, pos;
  136. 	node * head=NULL;
  137. 	while(n){
  138. 		head=addHead(head, n);
  139. 		n--;
  140. 	}
  141. 	display(head);
  142. 	printf("\n");
  143. 	head=addTail(head, 42);
  144. 	printf("After adding 42 to the tail\n");
  145. 	display(head);
  146. 	printf("\n");
  147. 	head=addBefore(head,1,0);
  148. 	head=addBefore(head,5,67);
  149. 	printf("After adding before 1 and 5 to the tail\n");
  150. 	display(head);
  151. 	printf("\n");
  152. 	head=deleteNode(head, 6);
  153. 	head=deleteNode(head, 0);
  154. 	head=deleteNode(head, 10);
  155. 	printf("After deleting some elements from the linked list\n");
  156. 	display(head);
  157. 	printf("\n");
  158.  
  159. 	printf("the number of elements is: %d\n",nbElemets(head));
  160.  
  161. 	//printf("Donnez la position de l element a rechercher depuis la fin");
  162. 	//scanf("%d",&pos);
  163. 	pos=4;
  164. 	node * nth=nthElement(head, pos);
  165. 	printf("\n");
  166. 	if(nth){
  167. 		printf("the %d elelemt from tail is: %d",pos, nth->data);
  168. 	}
  169. 	else
  170. 		printf("No %d th elelemt from tail ",pos);
  171. 		printf("\n");
  172. 		head=addBefore(head,42,9);
  173. 		head=addBefore(head,42,1);
  174. 			display(head);
  175. 	printf("\n");
  176. 	head=deleteLast(head,42);
  177. 	printf("\n");
  178. 				display(head);
  179. 	printf("\n");
  180.  
  181. 	return 0;
  182. }
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Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
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Standard input is empty
stdout
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1	2	3	4	5	6	7	8	9	10	
After adding 42 to the tail
1	2	3	4	5	6	7	8	9	10	42	
After adding before 1 and 5 to the tail
0	1	2	3	4	67	5	6	7	8	9	10	42	
After deleting some elements from the linked list
1	2	3	4	67	5	7	8	9	42	
the number of elements is: 10

the 4 elelemt from tail is: 7
1	2	3	4	67	5	7	8	9	9	1	42	

1	2	3	4	67	5	7	8	9	9	1
https://ideone.com/HSkknm
language:
C (clang 8.0)
created:
2 days ago
visibility:
public

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