Hex / rescue

ruby-talk
1

hello,

there are a few questions after I've read the
manual...

``String.hex´´ converts a hex-string to a decimal
number. But how to convert a decimal number to a
hex value?

If I do

begin
  ...
rescue
  ...
end

catches the rescue part every error?
I can also write ``rescue StandardError, SyntaxError, ...

greetings,
mark

2

mark greenlancer wrote:

hello,

Moin!

there are a few questions after I've read the
manual...

``String.hex´´ converts a hex-string to a decimal
number. But how to convert a decimal number to a
hex value?

I think that String#hex should not be used anymore.

I would use "deadbeef".to_i(16) for converting from a String to a number and 36.to_s(16) for the other way.

If I do

begin
...
rescue
...
end

catches the rescue part every error?
I can also write ``rescue StandardError, SyntaxError, ...

It is the same as 'rescue StandardError' -- if you want to rescue all errors you should use 'rescue Exception' instead.

greetings,
mark

Regards,
Florian Gross

3

number.to_s(16)

It works for other bases too :slight_smile:

martin

···

mark greenlancer <markgreenlancer@aon.at> wrote:

hello,

there are a few questions after I've read the
manual...

``String.hex´´ converts a hex-string to a decimal
number. But how to convert a decimal number to a
hex value?