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  1. /* 
  2.  * File:   evenoddlinkedlist.c
  3.  * Author: srkrishnan
  4.  *
  5.  * Created on June 30, 2011, 4:26 PM
  6.  */
  7.  
  8. #include <stdio.h>
  9. #include <stdlib.h>
  10.  
  11. typedef struct List {
  12.     int data;
  13.     struct List *link;
  14. } List;
  15.  
  16. List *createnode(int data) {
  17.     List *n = (List*) malloc(sizeof (List));
  18.     n->data = data;
  19.     n->link = NULL;
  20.     return n;
  21. }
  22.  
  23. List *evenodd(List *head) {
  24.     List *evenhead = NULL, *oddhead = NULL, *eventail = NULL, *oddtail = NULL;
  25.     while (head != NULL) {
  26.         if (head->data % 2 == 0) {
  27.             if (evenhead == NULL) {
  28.                 evenhead = head;
  29.                 eventail = head;
  30.             } else {
  31.                 eventail->link = head;
  32.                 eventail = head;
  33.             }
  34.         } else {
  35.             if (oddhead == NULL) {
  36.                 oddhead = head;
  37.                 oddtail = head;
  38.             } else {
  39.                 oddtail->link = head;
  40.                 oddtail = head;
  41.             }
  42.         }
  43.         head = head->link;
  44.     }
  45.     if (evenhead != NULL)
  46.         eventail->link = oddhead;
  47.     else
  48.         evenhead = oddhead;
  49.     if (oddtail != NULL)
  50.         oddtail->link = NULL;
  51.     return evenhead;
  52. }
  53.  
  54. int main(int argc, char** argv) {
  55.  
  56.     List *tmp = NULL, *head = createnode(41);
  57.     head->link = createnode(201);
  58.     head->link->link = createnode(21);
  59.     head->link->link->link = createnode(51);
  60.     head->link->link->link->link = createnode(151);
  61.     head->link->link->link->link->link = createnode(21212);
  62.     head->link->link->link->link->link->link = createnode(211);
  63.  
  64.     tmp = head;
  65.     while (tmp) {
  66.         printf("%d->", tmp->data);
  67.         tmp = tmp->link;
  68.     }
  69.     printf("NULL\n");
  70.  
  71.     tmp = evenodd(head);
  72.     printf("Arranging......\n");
  73.     while (tmp) {
  74.         printf("%d->", tmp->data);
  75.         tmp = tmp->link;
  76.     }
  77.     printf("NULL");
  78.  
  79.  
  80.     return (EXIT_SUCCESS);
  81. }
  82.  
Success #stdin #stdout 0s 1852KB
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Standard input is empty
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41->201->21->51->151->21212->211->NULL
Arranging......
21212->41->201->21->51->151->211->NULL
https://ideone.com/1I40z
language:
C (gcc 8.3)
created:
14 years ago
visibility:
secret

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