Rjust alignment

Ruby
1

I think I’m going crazy. I tried to write a fairly simple program to
test ljust, center and rjust. But I cannot make the page numbers of my
table of contents line up. I tried to account for the string length of
the chapter and topics; I’ve tried a lot of things and I just cannot get
the page numbers to line up. If anyone knows how to do it please let me
know. I don’t think I’ll be able to go to bed without figuring it out.
Here is my latest code and output:

////////// code //////////////

class TableOfContents
attr_accessor :chapters, :topics, :pages
end

toc = TableOfContents.new
toc.chapters = [“Chapter 1”, “Chapter 2”, “Chapter 3”]
toc.topics = [“Numbers”, “Letters”, “Variables”]
toc.pages = [“Page 1”, “Page 57”, “Page 117”]

lineWidth = 20
3.times do |x|
offset = toc.chapters[x] + ": " + toc.topics[x]
offset = 40 - offset.length
puts toc.chapters[x] + ": " + toc.topics[x] +
toc.pages[x].rjust(lineWidth + offset + (10 - toc.pages[x].length))
end

//////////// output /////////////////

Chapter 1: Numbers Page 1
Chapter 2: Letters Page 57
Chapter 3: Variables Page 117

!! Using this line rather than the above line 14 gives this

new line 14:

puts toc.chapters[x] + ": " + toc.topics[x] +
toc.pages[x].rjust(lineWidth)

new output:

Chapter 1: Numbers Page 1
Chapter 2: Letters Page 57
Chapter 3: Variables Page 117

Thanks

2

Thanks. I am using FreeRIDE and the output shows up differently, but if
I copy and paste the output to a text file it is lined up like it is
supposed to be.

Thanks for the suggestions.

3

Maybe you’re looking at the numbers wrong.
You could roll your own pretty easily.
Some pseudo code:

TotalWidth = x
TotalWidthForLine = TotalWidth - ( ChapterTitleWidth + PageNumberWidth )

4

On Behalf Of Ross:

I think I’m going crazy. I tried to write a fairly simple program to

relax.

toc.pages[x].rjust(lineWidth + offset + (10 - toc.pages[x].length))

toc.pages[x].rjust(offset+10) #<-try this first

suggest to take a second look to #just… it rjusts the whole string.
subtraction not needed :slight_smile:

sample output should then be,

C:\family\ruby>cat -n test.rb
1 class TableOfContents
2 attr_accessor :chapters, :topics, :pages
3 end
4
5 toc = TableOfContents.new
6 toc.chapters = [“Chapter 1”, “Chapter 2”, “Chapter 3”]
7 toc.topics = [“Numbers”, “Letters”, “Variables”]
8 toc.pages = [“Page 1”, “Page 57”, “Page 117”]
9
10 lineWidth = 20
11 3.times do |x|
12 offset = toc.chapters[x] + ": " + toc.topics[x]
13 offset = 40 - offset.length
14 puts toc.chapters[x] + ": " + toc.topics[x] +
15 toc.pages[x].rjust(offset)
16 #toc.pages[x].rjust(offset+10,“x”)
17 end

C:\family\ruby>ruby test.rb
Chapter 1: Numbers Page 1
Chapter 2: Letters Page 57
Chapter 3: Variables Page 117

C:\family\ruby>

btw, i’d suggest you put “Chapter”, and “Page” as headers, like so,

Chapter Page
1: Numbers 1
2: Letters 57
3: Variables 117

kind regards -botp