Convert string to decimal number in ruby

Solution 1:

You call to_i, you get integer.

Try calling to_f, you should get a float.

For more string conversion methods, look here.

Solution 2:

If you want more accurate answer with the calculation to avoid bug like this https://www.codecademy.com/en/forum_questions/50fe886f68fc44056f00626c you can use conversion to decimal example :

require 'bigdecimal'
require 'bigdecimal/util'

size = ARGV[0]
size = size.to_d

this should make the printed number become decimal but if you want to make it as float again just put this to_f again

size=size.to_f

puts size

Solution 3:

You also can use the decimal class for it

a = '2.45'
Decimal(a) # => 2.45

UPDATE:

Use bigdecimal as @bigtex777 mentioned:

source: http://ruby-doc.org/stdlib-2.2.2/libdoc/bigdecimal/rdoc/BigDecimal.html

Solution 4:

Capitalized conversion methods are a well-established Ruby idiom. See this great post from Advi Grimm

Integer("641339524823408659")
=> 641339524823408659