Convert string to decimal number in ruby
RubyNumbersDecimalRuby Problem Overview
I need to work with decimals. In my program, the user need to put a number with decimals to convert that number.
The problem is: If I try to convert the argument into a number I get a integer without decimals.
# ARGV[0] is: 44.33
size = ARGV[0]
puts size.to_i
# size is: 44
# :(
Ruby Solutions
Solution 1 - Ruby
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 - Ruby
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 - Ruby
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 - Ruby
Capitalized conversion methods are a well-established Ruby idiom. See this great post from Advi Grimm
Integer("641339524823408659")
=> 641339524823408659