From: Robert McGovern <tarasis@...>
Date: 2002-10-15T01:38:05+09:00
Subject: & operation and if statment

I'm puzzled by the behaviour in the following run. I would expect line 2 
to not print out "ouch" because the result of the if statement is 0 
(verified online 8)

$ ruby -v
ruby 1.7.3 (2002-09-20) [i386-cygwin]

$ irb
irb(main):001:0> data = 0x00
0
irb(main):002:0> puts "ouch" if (data & 0x80)
ouch
nil
irb(main):003:0> puts "ouch" if (data & 0x80) != 0
nil
irb(main):004:0> data = 0x90
144
irb(main):005:0> puts "ouch" if (data & 0x80)
ouch
nil
irb(main):006:0> puts "ouch" if (data & 0x80) != 0
ouch
nil
irb(main):007:0> data = 0x00
0
irb(main):008:0> data & 0x80
0
irb(main):009:0>

Rob



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