count nodes

Author: joharbatta

Trees/btreeCountNodes.java

@@ -0,0 +1,45 @@
+
+class Node
+{
+    int data;
+    Node left;
+    Node right;
+    Node(int data)
+    {
+        this.data=data;
+        left=right=null;
+    }
+}
+
+class BinaryTree{
+    Node root;
+    BinaryTree() 
+    { 
+        root = null; 
+    } 
+    BinaryTree(int data)
+    {
+        this.root=new Node(data);
+    }
+    int count(Node head)
+     {
+        
+        if(head==null)
+        {
+            return 0;
+        }
+        return 1+count(head.left)+count(head.right);
+    }
+}
+
+class btreeCountNodes{
+    public static void main(String[] args) {
+
+        BinaryTree bt=new BinaryTree(2);
+        bt.root.left=new Node(3);
+        bt.root.right=new Node(5);
+        bt.root.left.right=new Node(9);
+        bt.root.right.left=new Node(7);
+        System.out.println(bt.count(bt.root));
+    }
+}