Formatting text

Ruby
1

Hi again :slight_smile:
Is there any way to format a string. I.E. I’ve got a variable which may
be 1, 2, 3 and the variable is added to string. I want to show whole
string formatted as follows:
100
1
10
1100

not like that:
100
1
10
1100

Any help would be helpful (as always :wink: )

thanks in advance

2

2007/7/25, Marcin T. [email protected]:

100
1
10
1100

Any help would be helpful (as always :wink: )

Please look for printf, sprintf and % in the docs. The last one might
be hard to find. You use it as: “%3d” % 1

Kind regards

robert

3

From: Marcin T. [mailto:[email protected]]

Is there any way to format a string. I.E. I’ve got a variable

which may be 1, 2, 3 and the variable is added to string. I want

to show whole string formatted as follows:

100

1

10

1100

it would be nice to show original string and it’s transformation,

but anyway, is it like this?

irb(main):092:0> “1 20 333 1000 55”.split.each{|x| puts x.rjust(4)}
1
20
333
1000
55

this is just using #rjust.

irb(main):093:0> system “qri String#rjust”
----------------------------------------------------------- String#rjust
str.rjust(integer, padstr=’ ') => new_str

 If integer is greater than the length of str, returns a new String
 of length integer with str right justified and padded with padstr;
 otherwise, returns str.

    "hello".rjust(4)            #=> "hello"
    "hello".rjust(20)           #=> "               hello"
    "hello".rjust(20, '1234')   #=> "123412341234123hello"

=> true
irb(main):094:0>

robert already gave a handful of other hints.

kind regards -botp

4

Marcin T. wrote:

Robert K. wrote:

Please look for printf, sprintf and % in the docs. The last one might
be hard to find. You use it as: “%3d” % 1

OK, Fine. But… I want to format the string not its output to redirect
the string to a file on remote machine (the file should be formatted).

sprintf and % return a string, they don’t print anything to the screen.
You
can write the result of “%3d” % 1 to a file without a problem.

5

Robert K. wrote:

2007/7/25, Marcin T. [email protected]:

100
1
10
1100

Any help would be helpful (as always :wink: )

Please look for printf, sprintf and % in the docs. The last one might
be hard to find. You use it as: “%3d” % 1

Kind regards

robert

OK, Fine. But… I want to format the string not its output to redirect
the string to a file on remote machine (the file should be formatted).

6

2007/7/25, Marcin T. [email protected]:

be hard to find. You use it as: “%3d” % 1

Kind regards

robert

OK, Fine. But… I want to format the string not its output to redirect
the string to a file on remote machine (the file should be formatted).

Now what? Do you want to output or not? I do not understand your
remark because with the methods I listed you can do output as well as
change strings.

robert

7

From: Marcin T. [mailto:[email protected]]

OK, Fine. But… I want to format the string not its output

to redirect the string to a file on remote machine (the file

should be formatted).

the simple way is just do the output on screen (in a format you want).
then if you’re happy with the output, just redirect it to a file.

like eg,

ruby mytestprogram.rb > myfile

just try it.

kind regards -botp

8

On Jul 25, 5:54 am, Sebastian H. [email protected]
wrote:

sprintf and % return a string, they don’t print anything to the screen. You
can write the result of “%3d” % 1 to a file without a problem.

Same is true for rjust() :
http://www.whytheluckystiff.net/ruby/pickaxe/html/ref_c_string.html#String.rjust