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package trees.binaryTree;
/*
* Problem Title :- Pre-order Traversal of a tree using Recursion
*/
public class BT_Problem_07_b {
// Root of Binary Tree
Node root;
// Constructor
BT_Problem_07_b(){
root = null;
}
/*
* Given a binary tree,
* print its nodes in preorder
*/
void printPreorder(Node node) {
if(node == null) return;
/* first print data of node */
System.out.print(node.data + " ");
/* then recur on left subtree */
printPreorder(node.left);
/* now recur on right subtree */
printPreorder(node.right);
}
// Wrappers over above recursive function
void printPreorder() {
printPreorder(root);
}
//Driver Code
public static void main(String[] args) {
BT_Problem_07_b tree = new BT_Problem_07_b();
tree.root = new Node(1);
tree.root.left = new Node(2);
tree.root.right = new Node(3);
tree.root.left.left = new Node(4);
tree.root.left.right = new Node(5);
System.out.println("Preorder traversal of binary tree is ");
tree.printPreorder();
}
}