Re^2: program that counts all the vertices in a given tree

The rest of the program is given in the link above. I don't see a way to delete that.
I tried doing this instead:
vertices(pre_order($root))
but that just gives the output of pre_order($root) again and says the number of vertices is 0.

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Re^3: program that counts all the vertices in a given tree by o_0 (Initiate) on Jul 01, 2013 at 02:36 UTC
"traverse the tree and keep count" - that was the ticket, thanks. By the way, someone mentioned plagiarism. Is it plagiarism if I mentioned the book, and also I modified the code?	[reply]
Re^4: program that counts all the vertices in a given tree by Anonymous Monk on Jul 01, 2013 at 03:00 UTC
FWIW , source code is meant to be shared/modified, see http://pleac.sourceforge.net/pleac_perl/referencesandrecords.html	[reply]