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What will be the output, Please explain?

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This will print Binary equivalent of number n. It will keep dividing by two, the number until it will reach to 1 or 0. Then it start printing in reverse.

The reverse order comes from the fact that its a head Recursion (A recursion is called head recursion when function get called before print statement).

For example if we call this f(10) then it will print 1010. 

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