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free ocr for mac - pdf ocr x community ... Edition is a free desktop OCR app for macOS based on the open source ... Let us trace through the postorder traversal We initialize the traversal by ' pushing root a onto the stack The first pop visits a This is a s first pop, so it is placed back on the stack, and we push its left child b, onto the stack Next b is popped It is b's first pop, so it is placed back on the stack Normally, b's left child would then be pushed, but b has no left child, so nothing is pushed Thus the next pop reveals b for the second time, b is placed back on the stack, and its right child, d,is pushed onto the stack The next pop produces d for the first time, and d is pushed back onto the stack No other push is performed because d has no left child Thus d is popped for the second time and is pushed back, but as it has no right child, nothing else is pushed Therefore the next pop yields d for the third time, and d is marked as a visited node The next node popped is b, and as this pop is b's third, it is marked visited Then a is popped for the second time, and it is pushed back onto the stack along with its right child, cNext, c is popped for the first time, so it is pushed back, along with its left child, eNow e is popped, pushed, popped, pushed, and finally popped for the third time (typical for leaf nodes) Thus e is marked as a visited node Next, c is popped for the second time and is pushed back onto the stack However, it has no right child, so it is immediately popped for the third time and marked as visited Finally, a is popped for the third time and marked as visited At this point, the stack is empty and the postorder traversal terminates The POStorder class is implemented directly from the algorithm described previously and is shown in Figure 1827 The StNode class represents the objects placed on the stack It contains a pointer to a node and an integer that stores the number of times the item has been popped from the stack An StNode object is always initialized to reflect the fact that it has not yet been popped from the stack (We use a Stack class from 16) The Postorder class is derived from TreeIterator and adds an internal stack to the inherited data members The Postorder class is initialized by initializing the TreeIterator data members and then pushing the root onto the stack This process is illustrated in the constructor at lines 34 to 39 Then first is implemented by clearing the stack, pushing the root, and calling advance Figure 1828 implements advanceIt follows the outline almost verbatim Line 7 tests for an empty stack If the stack is empty, we have completed the iteration and can set current to NULL and return (If current is already NULL,we have advanced past the end, and an exception is thrown) Otherwise, we repeatedly perform stack pushes and pops until an item emerges from the stack for a third time When this happens, the test at line 19 is successful and we can return Otherwise, at line 25 we push the node back onto the stack (note that the timesPopped component has already been incremented at line 19) We then implement the recursive call If the. best free pdf ocr mac: Where can i find a free . Net (C#) library that i can use to scan ... best pdf ocr software mac ABBYY FineReader Online : OCR Online - Text Recognition & PDF ...
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