ASCII code thing...what gives?

[Todd]

Hello,

irb(main):001:0> ?T
=> 84

irb(main):002:0> "\84"
=> "84"

irb(main):003:0> "\124"
=> "T"

irb(main):004:0> "\124\84"
=> "T84"

What? Do these operators not do what I think they should?

Todd

 

[Bill Kelly]

Hi,

irb(main):001:0> ?T
=> 84

irb(main):002:0> "\84"
=> "84"

irb(main):003:0> "\124"
=> "T"

irb(main):004:0> "\124\84"
=> "T84"

8 is too big for octal... So I think the \8 is just
ignored, leaving the literal "84".



Regards,

Bill

 

[Bob Hutchison]

That 124 octal equals 84 decimal may be a clue. I don't have my Ruby
docs here or I'd look further myself.

 

[Jeffrey Dik]

Hello,

irb(main):001:0> ?T
=> 84

irb(main):002:0> "\84"
=> "84"

irb(main):003:0> "\124"
=> "T"

irb(main):004:0> "\124\84"
=> "T84"

What? Do these operators not do what I think they should?

84 is 124 in octal.

Hope that helps,
Jeff

 

[Dale Martenson]

irb(main):001:0> ?T

=> 84

The '?' operator returns the ascii code of the character

irb(main):002:0> "\84"
=> "84"

I think this is evaluated as "\8" and "4". "\x" returns "x" so "84"
makes sense.

Note: there is no decimal substitution only "\nnn" (octal) and "\xnn"
(hex).

irb(main):003:0> "\124"
=> "T"

This matches the octal form a substitution so it is correct.

irb(main):004:0> "\124\84"
=> "T84"

As previously shown the first part matches the octal substitution
"\124" => "T". The second part matches "\8" + "4" => "84". Thus "T84"
is correct.

 

[Todd]

The '?' operator returns the ascii code of the character


I think this is evaluated as "\8" and "4". "\x" returns "x" so "84"
makes sense.

Note: there is no decimal substitution only "\nnn" (octal) and "\xnn"
(hex).


This matches the octal form a substitution so it is correct.


As previously shown the first part matches the octal substitution
"\124" => "T". The second part matches "\8" + "4" => "84". Thus "T84"
is correct.

Yes, thanks to everyone for the quick response. I don't even know
where I originally heard of the "\nn" operator, so couldn't find the
doc on it (maybe Pickaxe?).

my_num.chr will work perfect.

Thanks again,
Todd

 

[daz]

Yes, thanks to everyone for the quick response. I don't even know
where I originally heard of the "\nn" operator, so couldn't find the
doc on it (maybe Pickaxe?).

Programming Ruby (original)

The Ruby Language -> The Basic Types -> Strings

http://www.rubycentral.com/book/language.html#UD


daz