C Program for Depth First Binary Tree Search Recursion in Linux.
Source Code:
#include <stdio.h>
#include <stdlib.h>
struct node
{
int a;
struct node *left;
struct node *right;
};
void generate(struct node **, int);
void DFS(struct node *);
void delete(struct node **);
int main()
{
struct node *head = NULL;
int choice = 0, num, flag = 0, key;
do
{
printf("\nEnter your choice:\n1. Insert\n2. Perform DFS Traversal\n3. Exit\nChoice: ");
scanf("%d", &choice);
switch(choice)
{
case 1:
printf("Enter element to insert: ");
scanf("%d", &num);
generate(&head, num);
break;
case 2:
DFS(head);
break;
case 3:
delete(&head);
printf("Memory Cleared\nPROGRAM TERMINATED\n");
break;
default:
printf("Not a valid input, try again\n");
}
} while (choice != 3);
return 0;
}
void generate(struct node **head, int num)
{
struct node *temp = *head, *prev = *head;
if (*head == NULL)
{
*head = (struct node *)malloc(sizeof(struct node));
(*head)->a = num;
(*head)->left = (*head)->right = NULL;
}
else
{
while (temp != NULL)
{
if (num > temp->a)
{
prev = temp;
temp = temp->right;
}
else
{
prev = temp;
temp = temp->left;
}
}
temp = (struct node *)malloc(sizeof(struct node));
temp->a = num;
if (num >= prev->a)
{
prev->right = temp;
}
else
{
prev->left = temp;
}
}
}
void DFS(struct node *head)
{
if (head)
{
if (head->left)
{
DFS(head->left);
}
if (head->right)
{
DFS(head->right);
}
printf("%d ", head->a);
}
}
void delete(struct node **head)
{
if (*head != NULL)
{
if ((*head)->left)
{
delete(&(*head)->left);
}
if ((*head)->right)
{
delete(&(*head)->right);
}
free(*head);
}
}
OUTPUT
$ cc pgm34.c $ a.out Enter your choice: 1. Insert 2. Perform DFS Traversal 3. Exit Choice: 1 Enter element to insert: 5 Enter your choice: 1. Insert 2. Perform DFS Traversal 3. Exit Choice: 1 Enter element to insert: 3 Enter your choice: 1. Insert 2. Perform DFS Traversal 3. Exit Choice: 1 Enter element to insert: 4 Enter your choice: 1. Insert 2. Perform DFS Traversal 3. Exit Choice: 1 Enter element to insert: 2 Enter your choice: 1. Insert 2. Perform DFS Traversal 3. Exit Choice: 1 Enter element to insert: 7 Enter your choice: 1. Insert 2. Perform DFS Traversal 3. Exit Choice: 1 Enter element to insert: 8 Enter your choice: 1. Insert 2. Perform DFS Traversal 3. Exit Choice: 1 Enter element to insert: 6 Enter your choice: 1. Insert 2. Perform DFS Traversal 3. Exit Choice: 2 2 4 3 6 8 7 5 Enter your choice: 1. Insert 2. Perform DFS Traversal 3. Exit Choice: 3 Memory Cleared PROGRAM TERMINATED
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