False || not(true)

ruby-talk
1

Volks

This is my 1st post to this ML,
but…

I read 'bout a problem: (false || not(true))
in a place, and made a little considerations.

I give NOW, the source code AsIs,
with the 'comments' in it…
＝＝＝＝＝
#!/usr/bin/env ruby -Ku

def case1(c)
  if c.nil?
  # does nothing
  elsif !c # c == false || not true
  # does nothing
  else
    puts "case1: ", c
  end
# It's just NO problem, in C-programmer fashion [not fully tested]
end

def case2(c)
  if c.nil?
  # does nothing
# c == false || not true if you want it to be TRUE, before that,
  #elsif c.class == Boolean or
  #elsif c.class != Char or something, you must ask.
# 1st of all, have WE Classes like Boolean or Char ???
  elsif c.class != String # now this line may be wrong question…
  # does nothing
    puts "case2: c is no String"
  elsif !c
    puts "case2: ", c
  end
end

c = STDIN.getc()

case1(c)
case2(c)

# Was it just Me? that
# got troubled with needless TRUE
# in evaluating True-False, aString(or aChar) AsIs…

···

=======================
  2 bits thinking helps 66.7%

Shindo Motoaki (Motoakira)

21, Higashi-Kurayoshi machi
Yonago City, Tottori Pref.
683-0815, Japan
TEL 81-859-33-7431/81-90-7593-3585 <motoakira@mac.com>

2

Hi,

I read 'bout a problem: (false || not(true))
in a place, and made a little considerations.

"||" is an operator that takes "expressions" for both operands, so that
you should provide parentheses around not, which is a "command". In
short, you should write

  c == false || (not true)

instead of

  c == false || not true

Shindo Motoaki (Motoakira)

21, Higashi-Kurayoshi machi
Yonago City, Tottori Pref.

Wow, you lived only 300m away from my parents' house.

              matz.

···

In message "Re: false || not(true)" on Sat, 5 Jul 2008 10:21:29 +0900, SHINDO Motoaki <motoakira@mac.com> writes:

3

Thank you >Matz-san…

which is a "command".

with it, you mean 'not' is not a Function?

http://www.ruby-lang.org/ja/man/html/_B1E9BBBBBBD2BCB0.html
seems tell 'not' is an Operator…
I'm not sure…

In short, you should write

c == false || (not true)

with the lines, my guess is to do with Priorities among Operators…
I'm not sure…(^_^ゞ

Wow, you lived only 300m away from my parents' house.

I should take it serious. Then,
('matz' + ('motoakira' - 'akira')) eval…(^_^ゞ

  objectively yours…

···

On 2008/07/05, at 15:44, Yukihiro Matsumoto wrote:

   I'm the One of Sad&Mad.

         Shindo Motoakira
    <motoakira@mac.com>