I got some code from the Perl Cookbook that generates a random tree and prints it out 3 different ways. I changed it a little, so that the number of vertices would be random. I want the code to count the number of vertices. Some output is below. It says the number of vertices is 1, but how do I get it to count the 5 vertices?
Sample output: 
Pre order:  760 75 455 751 839 
In order:   75 455 751 760 839 
Post order: 751 455 75 839 760 
Number of vertices: 1

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Code: 
#!/usr/bin/perl -w
 
use strict;
my($root, $n);
 
# first generate random inserts
while ($n++ < int(rand(5))+5) { insert($root, int(rand(1000)))}
 
# now dump out the tree all three ways
print "Pre order:  ";  pre_order($root);  print "\n";
print "In order:   ";  in_order($root);   print "\n";
print "Post order: ";  post_order($root); print "\n";
 
vertices($root);
exit;
 
###################
 
sub vertices { 
my $number=@_;
print "Number of vertices: $number";
}

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In reply to program that counts all the vertices in a given tree by o_0

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