From: Tim Hunter <TimHunter@...>
Date: 2009-08-29T05:57:02+09:00
Subject: Re: Error with an array of strings

Tom Smith wrote:
> Hi,
> This is clearly a Ruby beginner question, so please be nice :)
> 
> This program is supposed to take user input of numbers and average the
> numbers. I figured I'd create a loop, an array, and then average the
> numbers by dividing by the total length of the array.
> 
> #Get numbers
> total = [ ]
> 
> until $_  == "n"
> puts "Enter Number:\n"
> number = STDIN.gets
> number.chop!
> number.to_i
> 
> total.push(number) #puts all the numbers into the array
> 
> print "add more numbers to average? y or n\n"
> continue = STDIN.gets
> continue.chop!
> 
> end
> 
> #Compute Average
> 
> all = total.slice(0..total.length) #slices the array no matter how large
> it is
> 
> averageall = [all.slice(0..total.length)] / total.length
> 
> puts "Average is:", averageall,"\n"
> 
> Needless to say, I'm getting an error with the averageall, since (I
> assume) it's trying to divide by strings. I figure I need to convert the
> array of strings to an array of integers. Alas, I can't seem to track
> down the correct solution. Any help would be much appreciated for this
> newbie to Ruby.
> 
> Thanks.

The to_i method converts a string to an integer, assuming the string 
really can be so converted.

"1".to_i => 1

["1", "2", "3"].map {|d| d.to_i} => [1, 2, 3]

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