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N will never be 1; thus the app will never exit the while-loop.
Actually, if you run it you'll see that it does exit the while loop (3-->10-->5-->16-->8-->4-->2-->1) but since the condition that makes it exit from the while loop is N==1, N is never >=5. So the program certainly "works"; however, it's up to interpretation whether or not "do what I meant, not what I wrote" has been fulfilled.
Kevin Barry
PS It could be that N needs to be copied when used in the loop.
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