Inorder, preorder, post order traversals using C

TRAVERSALS

#include<stdio.h>

#include<conio.h>

typedef struct node

{

int data;

struct node*left;

struct node*right;

}tree;

tree* createtree();

tree* insert(tree*,tree*);

void preorder(tree*);

void inorder(tree*);

void postorder(tree*);

void main()

{

int ch;

tree*bt;

clrscr();

bt=createtree();

printf("\n \tBINARY TREE TRAVERSAL \n");

printf("\n \t1.traversals \n");

printf("\n \t2.exit\n");

printf("\n \tenter your choice \n");

scanf("%d",&ch);

if(bt==NULL)

{

printf("\nbinary tree is empty\n");

return;

}

switch(ch)

{

case 1:

printf("\n \t preorder traversal \n");

preorder(bt);

printf("\n \t inorder traversal \n");

inorder(bt);

printf("\n \t postorder traversal \n");

postorder(bt);

break;

case 2:

printf("\n exit");

exit(0);

}

getch();

free(bt);

}

tree* createtree()

{

char ch;

tree *bt=NULL,*temp;

do

{

temp=(tree*)malloc(sizeof(struct node));

printf("\n enter the data\n");

scanf("%d",&temp->data);

temp->left=NULL;

temp->right=NULL;

bt=insert(bt,temp);

fflush(stdin);

printf("\n want to add more data y/n :");

scanf("%c",&ch);

}while((ch=='y')||(ch=='Y'));

return bt;

}

tree* insert(tree *bt,tree *temp)

{

if(bt==NULL)

return temp;

else if(temp->data<bt->data)

bt->left=insert(bt->left,temp);

else if(temp->data>bt->data)

bt->right=insert(bt->right,temp);

else if(temp->data==bt->data)

{

printf("\n data is already existing \n");

return bt;

}

return bt;

}

void inorder(tree *bt)

{

if(bt)

{

inorder(bt->left);

printf("%d",bt->data);

inorder(bt->right);

}

}

void preorder(tree *bt)

{

if(bt)

{

printf("%d",bt->data);

preorder(bt->left);

preorder(bt->right);

}

}

void postorder(tree *bt)

{

if(bt)

{

postorder(bt->left);

postorder(bt->right);

printf("%d",bt->data);

}

}

SAMPLE OUTPUT:

Enter the data

5

Want to add more data y/n: Y

Enter the data

2

Want to add more data y/n: Y

Enter the data

3

Want to add more data y/n: Y

Enter the data

4

Want to add more data y/n: N

BINARY TREE TRAVERSAL

1.traversals

2.exit

Enter your choice

1

Preorder traversal 5234

Inorder traversal 2345

Postorder traversal 4325