Counting Program

Ruby
1

I recently actually started “studying” ruby again and attempted to
create a program that would add numbers and print them out (on the
screen of course). Of course the following code would not work:

time1=1
10000000.times do
puts time1+1
end

All it would do, is simply print out the number 2, 10000000 times. I
continually got errors when editing it. Could someone please assist?

With Thanks,

2

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Will M. wrote:

| time1=1
| 10000000.times do
| puts time1+1
| end
|
| All it would do, is simply print out the number 2, 10000000 times. I
| continually got errors when editing it. Could someone please assist?

Well, it’s as simple as adding a ‘=’:

time1 = 1
10000000.times do
~ time1 += 1 # this is shorthand for time1 = time1 + 1
~ puts time1
end

You need to tell Ruby, that you want to change the variable explicitly.

A quote I cannot attribute: “Computers never do what they should, only
what you tell them to do”. :wink:

It might help if you put spaces between operators, as that helps in
catching errors. I am speaking from experience.

Phillip G.
Twitter: twitter.com/cynicalryan

~ “That’s the whole problem with science. You’ve got a bunch of
~ empiricists trying to describe things of unimaginable wonder.”
~ — Calvin
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3

Thanks, that worked.

On Sun, Apr 20, 2008 at 4:33 PM, Phillip G.

4

Or even use a range:

(1…10).each { |num| p num }

5

it’s as simple as …

adding an argument list:

10.times do |time1|
puts time1+1
end

6

If I was to revise it to be able to simply type in a number and then
allow the program to count up to that on the screen how should it be
revised?

time2=(something with user input)
puts time2+=1
end

Something like that?

7

Hi –

On Thu, 24 Apr 2008, Dana M. wrote:

Or even use a range:

(1…10).each { |num| p num }

If you really just want to print out the numbers:

puts *1…10

David

8

On Apr 25, 10:08 am, Will M. [email protected] wrote:

No, I mean in a manner that allows user input. So you may type in a
number then allow the computer to count to that number.

require ‘readline’

num = ask('Count to what number?: )

num.times do |x|
puts x
sleep 1
x += 1
end

end

9

edit:

10

No, I mean in a manner that allows user input. So you may type in a
number then allow the computer to count to that number.

11

Received the following error: realcountin.rb:3 unterminated string
meets end of file

realcounting.rb:3: syntax error, unexpected $end, expecting ‘)’

12

Moral of the story: run your code before they all laugh at you.

require ‘rubygems’
require ‘highline/import’

count = ask('Count to what number?: ')

c = 0

amt = count.to_i + 1

amt.times do |c|
puts c
c += 1
sleep 1
end

13

print "Upto what number? " # ask the question
max = gets.to_i # get a string and convert it to a number
puts *(1…max) # creates a range from 1 to max, then turns it into an
array, then prints each one.

14

How are you running this? My snippet works from the command line, I
don’t know about irb. Save it as ‘countly.rb’ and try >ruby countly.rb

Interesting.

15

Still getting an error after editing to make:

require ‘rubygems’
require ‘highline/import’

count = ask('Count to what number?: ')

c = 0

amt = count.to_i + 1

amt.times do |c|
puts c
c += 1
sleep 1
end

Much larger error.

16

I suppose if we’re golfing:

p “Upto what number?”; p *1…gets.to_i

-Dana

17

The previous one worked. Thanks.

18

I didn’t know that! That’s awesome.

-Dana