C Program to Implement Depth First Search Traversal using Post Order

This C Program implements depth first search traversal using post order.

Here is source code of the C Program to implement depth first search traversal using post order. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C Program to Implement Depth First Search Traversal using Post Order
  3.        50
  4.       /  \
  5.     20   30
  6.    /  \    
  7.   70  80
  8.  /  \    \
  9. 10  40   60    
  10. (50, 20, 30, 70, 80, 10, 40, 60)
  11.  */
  12. #include <stdio.h>
  13. #include <stdlib.h>
  14.  
  15. struct btnode {
  16.     int value;
  17.     struct btnode *l;
  18.     struct btnode *r;
  19. };
  20.  
  21. typedef struct btnode bt;
  22. bt *root;
  23. bt *new, *list;
  24. bt *create_node();
  25. void display(bt *);
  26. void construct_tree();
  27. void dfs(bt *);
  28.  
  29. void main()
  30. {
  31.     construct_tree();
  32.     display(root);
  33.     printf("\n");
  34.     printf("Depth first traversal\n ");
  35.     dfs(root);
  36. }
  37.  
  38. /* Creates an empty node */
  39. bt * create_node()
  40. {
  41.     new=(bt *)malloc(sizeof(bt));
  42.     new->l = NULL;
  43.     new->r = NULL;
  44. }
  45.  
  46. /* Constructs a tree */
  47. void construct_tree()
  48. {
  49.     root = create_node();
  50.     root->value = 50;
  51.     root->l = create_node();
  52.     root->l->value = 20;
  53.     root->r = create_node();
  54.     root->r->value = 30;
  55.     root->l->l = create_node();
  56.     root->l->l->value = 70;
  57.     root->l->r = create_node();
  58.     root->l->r->value = 80;
  59.     root->l->r->r = create_node();
  60.     root->l->r->r->value = 60;
  61.     root->l->l->l = create_node();
  62.     root->l->l->l->value = 10;
  63.     root->l->l->r = create_node();
  64.     root->l->l->r->value = 40;      
  65. }
  66.  
  67. /* Display the elements in a tree using inorder */
  68. void display(bt * list)
  69. {
  70.     if (list == NULL)
  71.     {
  72.         return;
  73.     }
  74.     display(list->l);
  75.     printf("->%d", list->value);
  76.     display(list->r);
  77. }
  78.  
  79. /* Dfs traversal using post order */
  80. void dfs(bt * list)
  81. {
  82.     if (list == NULL)
  83.     {
  84.         return;
  85.     }
  86.     dfs(list->l);
  87.     dfs(list->r);
  88.     printf("->%d ", list->value);
  89. }


        50
       /  \
     20    30
     / \    
   70    80
  /  \     \
 10  40    60
$ cc tree29.c
$ a.out
->10->70->40->20->80->60->50->30
Depth first traversal
->10->40->70->60->80->20->30->50

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Manish Bhojasia, a technology veteran with 17+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer and SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage & Cluster Administration, Advanced C Programming, SAN Storage Technologies, SCSI Internals and Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him below.


Sanfoundry Training Center of Excellence (CoE)

Manish Bhojasia, a technology veteran with 17+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer and SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage & Cluster Administration, Advanced C Programming, SAN Storage Technologies, SCSI Internals and Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him below.







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