Binary Tree implementation and Traversal


Binary Tree and Traversal



#include<stdio.h>
#include<stdlib.h>
#include<malloc.h>
#include<string.h>
struct node
{
int data;
struct node *left;
struct node *right;
};
typedef struct node Node;


// Inorder traversal
void inorder(Node *root)
{
if (root == NULL) return;
inorder(root->left);
printf("%d ->", root->data);
inorder(root->right);
}


// Preorder traversal
void preorder(Node *root) {


if (root == NULL) return;
printf("%d ->", root->data);
preorder(root->left);
preorder(root->right);
}
// Postorder traversal
void postorder(Node *root) {
if (root == NULL) return;
postorder(root->left);
postorder(root->right);
printf("%d ->", root->data);
}


// Create a new Node
Node* createNode(value) {
Node *newNode = malloc(sizeof(Node));
newNode->data = value;
newNode->left = NULL;
newNode->right = NULL;


return newNode;
}


// Insert on the left of the node
Node* insertLeft(Node *root, int value) {
root->left = createNode(value);
return root->left;
}


// Insert on the right of the node
Node* insertRight(Node *root, int value) {
root->right = createNode(value);
return root->right;
}


int main() {
Node* root = createNode(50);
insertLeft(root, 20);
insertRight(root, 30);
insertLeft(root->left, 40);
insertRight(root->left, 10);
printf("Inorder traversal \n");
inorder(root);
printf("\nPreorder traversal \n");
preorder(root);
printf("\nPostorder traversal \n");
postorder(root);
}

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