I must create a little game; the one who play it must choose 2 numbers,
the beginning and the end of a range, and the program generate a secret
random number within that range, so the player must guess it!
But the problem is...how do I generate a random number?
I though at something like this:
number_to_guess = rand(n1..n2)
but it give me the error message "in `rand': can't convert Range into
Integer (TypeError)"
What can I do? Thanks!
--
Posted via http://www.ruby-forum.com/.
Reiichi Tyrael,
Is the range inclusive OR exclusive?
Should n1 OR n2 be reurned sometimes or never?
rand only accepts an integer which will make it produce values in the range 0...n (exclusive). So you can do:
irb(main):001:0> low, high = 12, 56
=> [12, 56]
irb(main):002:0> r = low + rand(high - low)
=> 54
Kind regards
robert
On 01.03.2010 20:21, Reiichi Tyrael wrote:
I must create a little game; the one who play it must choose 2 numbers,
the beginning and the end of a range, and the program generate a secret
random number within that range, so the player must guess it!
But the problem is...how do I generate a random number?
I though at something like this:number_to_guess = rand(n1..n2)
but it give me the error message "in `rand': can't convert Range into
Integer (TypeError)"What can I do? Thanks!
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/
David Springer wrote:
Reiichi Tyrael,
Is the range inclusive OR exclusive?
Should n1 OR n2 be reurned sometimes or never?
number_to_guess = rand(n1..n2)
Inclusive!
--
Posted via http://www.ruby-forum.com/\.
Reiichi Tyrael wrote:
Inclusive!
Okay, I'll assume that these are two different positive integers.
Try this:
number_to_guess = (n2 > n1) ? n1 + rand((n2-n1+1)) : n2 +
rand((n1-n2+1))
--
Posted via http://www.ruby-forum.com/\.
Sorry, I answered before seeing this email. In that case it should be
irb(main):003:0> low, high = 12, 34
=> [12, 34]
irb(main):004:0> r = low + rand(high + 1 - low)
=> 22
You can also do something like this:
irb(main):012:0> (low..high).to_a.sample
=> 21
irb(main):013:0> (low..high).to_a.sample
=> 27
Although in that case you should store the array somewhere for efficiency reasons.
Kind regards
robert
On 01.03.2010 20:40, Reiichi Tyrael wrote:
David Springer wrote:
Reiichi Tyrael,
Is the range inclusive OR exclusive?
Should n1 OR n2 be reurned sometimes or never?
number_to_guess = rand(n1..n2)
Inclusive!
--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/
It's work! Thank you David!
But there is no way to do it like in my version "rand(n1..n2)"? It's
more friendly that way XD
--
Posted via http://www.ruby-forum.com/.
Reiichi Tyrael wrote:
It's work! Thank you David!
But there is no way to do it like in my version "rand(n1..n2)"? It's
more friendly that way XD
#ruby 1.9
puts (10..20).to_a.sample
#ruby 1.8.6
puts (10..20).to_a.sort_by{rand}.pop
hth,
Siep
--
Posted via http://www.ruby-forum.com/\.
Reiichi Tyrael wrote:
It's work! Thank you David!
But there is no way to do it like in my version "rand(n1..n2)"? It's
more friendly that way XD
Sure:
def myrand(r=nil)
if r.is_a?(Range)
rand(r.last - r.first + (r.exclude_end? ? 0 : 1)) + r.first
else
rand(r)
end
end
Or if you prefer:
module Kernel
alias :orig_rand :rand
def rand(r=nil)
if r.is_a?(Range)
orig_rand(r.last - r.first + (r.exclude_end? ? 0 : 1)) + r.first
else
orig_rand(r)
end
end
end
I suspect it's not implemented in Ruby because it's not obvious what
rand(0.3..5.7) should do.
--
Posted via http://www.ruby-forum.com/\.
Under Ruby 1.9:
10.times.map{ Random.new.rand(20..30) } #=> [26, 26, 22, 20, 30,
26, 23, 23, 25, 22]