From: Graham Nicholls <graham@...>
Date: 2005-01-20T20:41:11+09:00
Subject: Confused about variable "declarations"


Page 14 of the new Pickaxe book says (amongst other things):

"Note that we didn't have to declare the variable 'result'; it sprang into
existence when we assigned to it."

This was my understanding, but I keep seeing this sort of thing:

../duprop:136:in `find_pcap_offset': undefined local variable or method
`offset' for #<Pcap_entry:0x40280794> (NameError)

when I run this:

offset=line.split()[1].to_i

Its easily fixed: I assign 0 to offset earlier in the method:

def find_pcap_offset  # Find the offset to the pcap entry for printer_name
    found=false
    offset=0         # <- This fixes things.
    begin
      pcap_file=File.open(@pcap_fname)
    rescue IOError
      print("can't open pcap file #{@pcap_fname}\n")
      exit(BAD_PCAP_FILE)
    end
    # OK, now find the pcap entry
    pcap_file.each_line() do |line|
      if line.match(@printer_name)
        print("Found printer #{@printer_name} in [#{line}]\n") if $debug
        found=true
        offset=line.split()[1].to_i
        break


Now I hate to do this - partly at least 'cause its clear evidence I don't
understand something!

Any help appreciated.
Graham Nicholls
-- 
With Linux the answer's always "Yes".
Now, whats the question?


----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==----
http://www.newsfeeds.com The #1 Newsgroup Service in the World! >100,000 Newsgroups
---= East/West-Coast Server Farms - Total Privacy via Encryption =---