Ruby/Number/Number Literal
Материал из Wiki.crossplatform.ru
Add commas to a big integer value
def commas(x) str = x.to_s.reverse str.gsub!("([0-9]{3})","\\1,") str.gsub(",$","").reverse end puts commas(123) # "123" puts commas(1234) # "1,234" puts commas(12345) # "12,435" puts commas(123456) # "123,456" puts commas(1234567) # "1,234,567"
Create an exponent
puts 31415.0e-4
Create binary numbers by prefacing them with 0b
puts 0b1111
Create floating-point numbers simply by using a decimal point
# you need at least one digit in front of the decimal point puts 3.1415
create hexadecimal numbers - base 16 - by prefacing them with 0x
puts 0xddff
Create octal number - base eight - numbers by prefacing them with a 0
puts 0355
Make number easier to read by using underscores every three digits from the right
puts 12_345_678_987_654_321
