How do I get a random number between two random numbers?
Alex Untitled
numbers. The problem is that I can't figure out how to make the numbers
that you're guessing between random and have the random number you are
guessing between those two numbers. Does anybody know how to do this?
--
Posted via http://www.ruby-forum.com/.
Marnen Laibow-Koser
> I want to create a program that asks you to guess a number between two
> numbers. The problem is that I can't figure out how to make the numbers
> that you're guessing between random and have the random number you are
> guessing between those two numbers. Does anybody know how to do this?
Well, you know how to generate the first two random numbers, right?
Just take the difference between those two as the range in which to
generate the third. Simple.
Best,
--
Marnen Laibow-Koser
http://www.marnen.org
mar...@marnen.org
Alex Untitled
So, would it be something like this?
num1 = rand(101)
num2 = rand(101)
num3 = num1 + num2
Anyway, thank you!
Tony Arcieri
On Sat, Nov 14, 2009 at 7:54 PM, Alex Untitled <somebod...@gmail.com>wrote:
> I want to create a program that asks you to guess a number between two
> numbers. The problem is that I can't figure out how to make the numbers
> that you're guessing between random and have the random number you are
> guessing between those two numbers. Does anybody know how to do this?
>
first + rand(last + 1 - first)
--
Tony Arcieri
Medioh/Nagravision
Alex Untitled
number between two numbers again? I can't seem to find it.
Alex Untitled
> OK, that didn't work. That just added the two numbers. How do I make a
> number between two numbers again? I can't seem to find it.
I did not see your reply when I typed this. Thanks!
Alex Untitled
num1 = rand(1001)
num2 = 1001 + rand(1001)
number = num1 + rand(num2)
Steve Wilhelm
> I found the solution.
>
> num1 = rand(1001)
> num2 = 1001 + rand(1001)
> number = num1 + rand(num2)
This can return: num1 = 1000, num2 = 1001, number = 2001
Try
module RandomNumberBetweenTwoRandomNumbers
def self.generate max
first = 1 + rand(max - 2);
second = max - rand(max - (first + 1))
between = first + 1 + rand((second - first) - 1)
[first, between, second]
end
end
puts RandomNumberBetweenTwoRandomNumbers::generate 10
puts RandomNumberBetweenTwoRandomNumbers::generate 100
puts RandomNumberBetweenTwoRandomNumbers::generate 1000
Josh Cheek
# How about something like:
max = 100
low , high = [ rand(max) , rand(max) ].sort
difference = high - low
middle = low + rand(difference).to_i #to_i for if low and high have same
value
puts "low = #{low}"
puts "middle = #{middle}"
puts "high = #{high}"
Steve Wilhelm
>
> # How about something like:
>
> max = 100
>
> low , high = [ rand(max) , rand(max) ].sort
>
> difference = high - low
>
> middle = low + rand(difference).to_i #to_i for if low and high have
> same
> value
>
> puts "low = #{low}"
> puts "middle = #{middle}"
> puts "high = #{high}"
The problem with your solution is that low and high can be the same
number.
Josh Cheek
In that case, the cardinality of the solution set is 1, perhaps not
desirable for a guessing game, but it is not stated that this should not
happen, and if no minimum range is specified, then it is subjective where
that line is drawn. ie if a solution set with cardinality 1 is not
appropriate, then what about a solution set with cardinality two? At what
point do we say the numbers are sufficiently far apart that they are
acceptable?
Perhaps a different approach is required altogether. Instead of giving the
maximum value the numbers can be, give the minimum and maximum difference
between the numbers. I don't see much value in a minimum number anyway,
choosing a random number between 90 and 100 doesn't seem to offer anything
over choosing a minimum number between 0 and 10.
While I think saying "give me an upper bound between 10 and 20, with a
target between 0 and that number" is a better approach, it is not what was
asked for, and I thought it would be better to answer the question as asked,
than to impose my own restrictions.
Giampiero Zanchi
a lot of improvements is possible;
range_size = 64
n_middle = rand(101) + range_size
n_decrease = rand(range_size)
n_left = n_middle - n_decrease
n_right = n_middle + (range_size - n_decrease - 1)
p "#{n_left} - #{n_middle} - #{n_right}"