Code:
#include stdio.h
#include stdlib.h
/*structure type to create a tree*/
struct node
{
int num;
struct node *left;
struct node *right;
};
/*
* structure type to point to the nodes of a tree
* and also create self-referential list used for
* queueing.
*/
struct queue
{
struct node *nodeptr;
struct queue *next;
};
/* resulting singly linked list */
struct list
{
int num;
struct list *next;
};
void createTree(struct node **);
void createlistbfs(struct node *, struct list **);
void delete(struct node **);
void display(struct list *);
void deleteList(struct list **);
int main()
{
struct node *root = NULL;
struct list *head = NULL;
createTree(&root);
createlistbfs(root, &head);
printf("Displaying the list generated at node by node level of the tree: ");
display(head);
deleteList(&head);
delete(&root);
return 0;
}
void createTree(struct node **root)
{
struct node *temp, *p, *q;
int a, ch;
do
{
printf("Enter a number for a node: ");
scanf("%d", &a);
temp = (struct node *)malloc(sizeof(struct node));
temp->num = a;
temp->left = NULL;
temp->right = NULL;
p = q = *root;
if (*root == NULL)
{
*root = temp;
}
else
{
while (1)
{
q = p;
if (p->num >= temp->num)
{
p = p->left;
}
else
{
p = p->right;
}
if (p == NULL)
{
break;
}
}
if (q->num >= temp->num)
q->left = temp;
else
q->right = temp;
}
printf("Do you want to continue? [1/0]: ");
scanf("%d", &ch);
} while (ch != 0);
}
void createlistbfs(struct node *root, struct list **head)
{
struct queue *qhead, *qrear, *qtemp, *qrelease;
struct list *temp, *rear;
if (root == NULL)
{
return;
}
qhead = (struct queue *)malloc(sizeof(struct queue));
qhead->nodeptr = root;
qhead->next = NULL;
qrear = qhead;
while (qhead != NULL)
{
temp = (struct list *)malloc(sizeof(struct list));
temp->num = qhead->nodeptr->num;
temp->next = NULL;
if (*head == NULL)
{
*head = temp;
}
else
{
rear->next = temp;
}
rear = temp;
if (qhead->nodeptr->left != NULL)
{
qtemp = (struct queue *)malloc(sizeof(struct queue));
qtemp->nodeptr = qhead->nodeptr->left;
qtemp->next = NULL;
qrear->next = qtemp;
qrear = qtemp;
}
if (qhead->nodeptr->right != NULL)
{
qtemp = (struct queue *)malloc(sizeof(struct queue));
qtemp->nodeptr = qhead->nodeptr->right;
qtemp->next = NULL;
qrear->next = qtemp;
qrear = qtemp;
}
qrelease = qhead;
qhead = qhead->next;
free(qrelease);
}
}
void delete(struct node **root)
{
if (*root == NULL)
{
return;
}
else
{
if ((*root)->left != NULL)
{
delete(&((*root)->left));
}
if ((*root)->right != NULL)
{
delete(&((*root)->right));
}
}
}
void display(struct list *head)
{
while (head != NULL)
{
printf("%d ", head->num);
head = head->next;
}
}
void deleteList(struct list **head)
{
struct list *temp;
temp = *head;
while (temp != NULL)
{
*head = (*head)->next;
free(temp);
temp = *head;
}
}
Output:
Enter a number for a node: 4
Do you want to continue? [1/0]: 1
Enter a number for a node: 2
Do you want to continue? [1/0]: 1
Enter a number for a node: 3
Do you want to continue? [1/0]: 1
Enter a number for a node: 1
Do you want to continue? [1/0]: 1
Enter a number for a node: 6
Do you want to continue? [1/0]: 1
Enter a number for a node: 5
Do you want to continue? [1/0]: 1
Enter a number for a node: 8
Do you want to continue? [1/0]: 1
Enter a number for a node: 7
Do you want to continue? [1/0]: 1
Enter a number for a node: 9
Do you want to continue? [1/0]: 0
Displaying the list generated at node by node level of the tree: 4 2 6 1 3 5 8 7 9
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