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Write the non-recursive algorithm to traverse a tree in preorder.
The Non- Recursive algorithm for preorder traversal is as follows:
Initially push NULL onto stack and then set PTR=Root. Repeat the steps until PTR= NULL.
1. Preorder down the left most path routed at PTR.
2. Processing every node N on the path and pushing every right child if any onto the stack.[The traversing stops when (PTR)=NULL]
3. Backtracking: pop and assign to PTR the top element on stack. If PTR not equal to NULL then return to step 1 or else exit.
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