Addition is associative. (1 + (2 + 3)) gives the same result as ((1 + 2) + 3). In the recursive function we are summing “from the right”, building up a stack of unresolved additions “on the left” which can’t be resolved until the right side is done. In our iterative solution we are summing “from the left”, and so do not need to defer any work.
Byte’s Extra All-IBM Edition - PDF Page 292 (Vintage Apple)
，这一点在heLLoword翻译中也有详细论述
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