puts ‘When you are finished, press ‘ENTER’ on an empty line’
puts 'I’ll give ‘em all back to you in alphabetical order!’
stuff = []
user_input = gets.chomp
while user_input != ‘’
stuff.push(user_input)
user_input = gets.chomp
end
puts stuff.sort.join(’, ')
Here is my code for the “array program” from chapter 7 and the
challenge is to now adapt the program to have the same output without
using the “sort” method.
I have no idea where to even start. I think we are supposed to iterate
over the array somehow but have no clue. Anybody got a hint for me?
Secondly, I have a question about this code for my Deaf Grandmother
program:
gcount = 0
puts “Hello child! How are yeah?”
while gcount < 3
r = gets.chomp
if r == r.downcase or r == r.capitalize
puts ‘WHAT? YOU’RE GONNA HAVE TO SPEAK UP!’
end
if (r == r.upcase and r != ‘BYE’)
puts ‘NOT SINCE 19’ + (rand(21)+30).to_s + ‘!’
end
if r == ‘BYE’
puts ‘NOT SINCE 19’ + (rand(21)+30).to_s + ‘!’
gcount = gcount + 1
end
if r != ‘BYE’
gcount = 0
end
end
The only problem with my program is when a user inputs something of
mixed case the program doesn’t respond with “WHAT? YOU’RE GONNA HAVE
TO SPEAK UP!” like it should…
Here is my code for the “array program” from chapter 7 and the
challenge is to now adapt the program to have the same output without
using the “sort” method.
I have no idea where to even start. I think we are supposed to iterate
over the array somehow but have no clue. Anybody got a hint for me?
Try inserting each input into a sorted array.
Secondly, I have a question about this code for my Deaf Grandmother
program:
[snip code]
The only problem with my program is when a user inputs something of
mixed case the program doesn’t respond with “WHAT? YOU’RE GONNA HAVE
TO SPEAK UP!” like it should…
Maybe use a regex to check for any lowercase letters. Instead of:
if r == r.downcase or r == r.capitalize
use:
if r =~ /[a-z]/
Here is my code for the “array program” from chapter 7 and the
challenge is to now adapt the program to have the same output without
using the “sort” method.
I have no idea where to even start. I think we are supposed to iterate
over the array somehow but have no clue. Anybody got a hint for me?
I haven’t read that tutorial so I don’t know what he is expecting you to
try.
But, here is a hint for something you could do.
arr = [“foo”,“bar”,“arrays are cool”,“rock”]
p arr.min
Mmmm… I’m not quite following? Wouldn’t I have to use the “sort”
method if I did that?
Don’t think about processing the array once you have all the inputs.
Think about processing as the inputs are gathered. You start with an
empty array; technically, that’s already sorted. When you get the
first word, you insert that and you still have a sorted array. From
here on out, just insert each word so that you maintain a sorted
array.
From reading the chapter, you’ll be able to do this with what you’ve
learned, but it will take two arrays and a lot of moving things back
and forth.
Maybe use a regex to check for any lowercase letters. Instead of:
if r == r.downcase or r == r.capitalize
use:
if r =~ /[a-z]/
I would but, he has yet to talk about REGEX at that point in the
tutorial and I feel like I would be cheating
Fair enough. Taking a quick glance at the Chris P. online book, I
think you’ll be able to do what you need using swapcase and downcase.
However, he hasn’t discussed that method at this point either…
OK, you could select a value from your array.
Then start comparing it to all other values one at a time.
Each time you compare, you select the smallest of the two and use that
as the one to use for future comparisons.
After one iteration, you have the min.
Ok guys, I’m pretty savvy and I think I have more than enough to go on
here…
One last question though…
I’m gonna run Linux and learn how to use it on my computer and I want
to use Colinux (free open source software) and was wondering if there
is a better alternative before I commit that ya’ll know of…
IIRC Colinux is some gizmo that lets you run Linux on a Windows
computer. I don’t think it’s anywhere near as robust as the free as in
beer VMware Server, and it’s certainly not as full-featured as VMware
Workstation 6. I’d stick with VMware for a beginner – I don’t think you
want to be futzing around with kernel-level stuff.
IIRC Colinux is some gizmo that lets you run Linux on a Windows
computer. I don’t think it’s anywhere near as robust as the free as in
beer VMware Server, and it’s certainly not as full-featured as VMware
Workstation 6. I’d stick with VMware for a beginner – I don’t think you
want to be futzing around with kernel-level stuff.
Seconded… I’ve never had as clean an experience with Colinux (however
elegant an idea it is) as with virtual machines.
Secondly, I have a question about this code for my Deaf Grandmother
program:
gcount = 0
puts “Hello child! How are yeah?”
while gcount < 3
r = gets.chomp
if r == r.downcase or r == r.capitalize
puts ‘WHAT? YOU’RE GONNA HAVE TO SPEAK UP!’
end
if (r == r.upcase and r != ‘BYE’)
puts ‘NOT SINCE 19’ + (rand(21)+30).to_s + ‘!’
end
if r == ‘BYE’
puts ‘NOT SINCE 19’ + (rand(21)+30).to_s + ‘!’
gcount = gcount + 1
end
if r != ‘BYE’
gcount = 0
end
end
The only problem with my program is when a user inputs something of
mixed case the program doesn’t respond with “WHAT? YOU’RE GONNA HAVE
TO SPEAK UP!” like it should…
Any ideas?
Thanks a lot!
Hi Daniel,
I’m also working through this book and having a lot of fun with it.
This is what I ended up with on the Granma prog (I added to the middle
part so she’d say a final farewell message, although obviously that
could be reduced to just “if speech == ‘BYE’ bye_num = bye_num + 1
else… etc” to make the prog shorter):
bye_num = 0
while bye_num != 3
puts ‘What do you have to say to Granma?’
speech = gets.chomp
if speech == ‘BYE’
if bye_num == 2
puts ‘OKAY, LEAVE ME THEN.’
bye_num = bye_num + 1
else
puts ‘WHAT’S THAT DEAR?’
bye_num = bye_num + 1
end
else
bye_num = 0
if speech == speech.upcase
puts ‘NO, NOT SINCE 19’ + (rand(21) + 30).to_s + ‘!’
else
puts ‘HUH?! SPEAK UP, SONNY!’
end
end
end
puts ‘When you are finished, press ‘ENTER’ on an empty line’
puts 'I’ll give ‘em all back to you in alphabetical order!’
stuff = []
user_input = gets.chomp
while user_input != ‘’
stuff.push(user_input)
user_input = gets.chomp
end
puts stuff.sort.join(’, ')
Here is my code for the “array program” from chapter 7 and the
challenge is to now adapt the program to have the same output without
using the “sort” method.
I have no idea where to even start. I think we are supposed to iterate
over the array somehow but have no clue. Anybody got a hint for me?
Secondly, I have a question about this code for my Deaf Grandmother
program:
gcount = 0
puts “Hello child! How are yeah?”
while gcount < 3
r = gets.chomp
if r == r.downcase or r == r.capitalize
puts ‘WHAT? YOU’RE GONNA HAVE TO SPEAK UP!’
end
if (r == r.upcase and r != ‘BYE’)
puts ‘NOT SINCE 19’ + (rand(21)+30).to_s + ‘!’
end
if r == ‘BYE’
puts ‘NOT SINCE 19’ + (rand(21)+30).to_s + ‘!’
gcount = gcount + 1
end
if r != ‘BYE’
gcount = 0
end
end
The only problem with my program is when a user inputs something of
mixed case the program doesn’t respond with “WHAT? YOU’RE GONNA HAVE
TO SPEAK UP!” like it should…
Any ideas?
Thanks a lot!
Just starting myself and enjoying the book (though I’m about to pull my
hair out with the sort exercise in Chapter 7 – the one that challenges
you to perform the sort without using .sort)
Here’s what I did …
# DEAF GRANDMA
byecount = 0
puts 'tell me sthign !'
while byecount < 3
sonnysays = gets.chomp
if sonnysays == sonnysays.upcase
if sonnysays == 'BYE'
puts 'do not go'
byecount = byecount +1
else
puts 'more to say?'
end
else
puts 'speak up; cannot hear.'
end
end
puts 'i will miss you sonny'
On Fri, Oct 8, 2010 at 12:59 PM, Pablo Roboto [email protected]wrote:
Just starting myself and enjoying the book (though I’m about to pull my
hair out with the sort exercise in Chapter 7 – the one that challenges
you to perform the sort without using .sort)
If it helps, I made some videos showing what sorts “look like” (some
creative liberties taken) Sort Algorithms on Vimeo In
particular,
look at insertion, selection, and bubble sorts. Those are usually
considered
pretty easy to understand, and are often the first sorts people are
taught.
Selection and Insertion are the kinds of sorts that humans do, for
example,
when sorting cards. If you have JRuby installed, you can generate the
images
yourself, and then flip through them forward and backward to see how
they
work. For some of them, that makes it more straightforward.
This forum is not affiliated to the Ruby language, Ruby on Rails framework, nor any Ruby applications discussed here.
