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To define recursive_power_of_2, you can take advantage of
the power_of_2 function already provided in
Chapter 20.
Given that power_of_2 exists, one way to define
recursive_power_of_2 is to hand over the real work to
power_of_2 as follows:
int recursive_power_of_2 (int n) {
return power_of_2 (n);
}
Once you see that you can define recursive_power_of_2 in terms of
power_of_2, you are ready to learn how gradually to turn
recursive_power_of_2 into a recursive function that does not rely
on power_of_2.