Oops, I got this slightly wrong.
On 12/12/13 08:50, Alan Gauld wrote:
mult(3,0)
It returns zero because b is zero, right?
Now consider what it does for
mult(3,1)
It checks if b is zero, it's not, so it executes
rest = 3 + mult(3,0)
Sorry, it actually does:
rest = mult(3,0)
So rest equals zero.
Because, as we saw above, mult(3,0) returns zero.
Now it executes
value = 3 + 0 # a + rest
so value is now 3
and that's what we return.
The value of mult(3,1) is 3.
Do you understand this far?
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.flickr.com/photos/alangauldphotos
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