Iterative code for Inorder Traversal in C - Binary Tree

Iterative code for inorder traversal uses Stack to print the tree in inorder. The idea behind this code is to push the elements into stack , popping and printing it . 

Steps are given below 

     1. Get the root element and left side children and push it into stack .

     2. Pop the element from stack , print it and check whether is has right child or not . If it has push right child and its left children into stack . 

     3. Continue step 2 until there is no element in stack . 

For the above diagram inorder traversal is 

1 2 3 4 5 6 7 

Code :(in C)

Please let me know if you have any questions .