On 12/11/2013 07:15 PM, Alan Gauld wrote:
Remember we are calling mul() several times, each with a new set of values.
So mul(3,2) calls mul(3,1)
and mul(3,1) calls mul(3,0)
mul(3.0) returns 0 to mul(3,1)
mul(3,1) then returns 3+0 => 3 to mul(3,2)
mul(3,2) returns 3+3 => 6.
This is a very clear explanation of the process: especially that the sequence of
calls goes top->down, while the sequence of execution goes backward, down->up.
(And the latter is what counts in forming the result. If we were recording
partial results [sub_res in my examples], then they would be backwards)
denis
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