SICP exercise 1.16, where is my bug, because it looks right to me?

You forgot to call fast-exp. Instead, you evaluated three separate atoms. To actually evaluate the fast-exp of 4 to the 2, you'd have to write (fast-exp 4 2).

Hah! Many thanks – Dave Oct 29 '09 at 13:36.

The solution you have written here is also incorrect. E.g. Check out (fast-exp 2 6).

Expected: 64, actual: 32.

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