Returns the result of interpreting leading characters in str as a BigDecimal.
require 'bigdecimal' require 'bigdecimal/util' "0.5".to_d # => 0.5e0 "123.45e1".to_d # => 0.12345e4 "45.67 degrees".to_d # => 0.4567e2
See also BigDecimal::new.
Returns a rational which denotes the string form. The parser ignores leading whitespaces and trailing garbage. Any digit sequences can be separated by an underscore. Returns zero for null or garbage string.
NOTE: ‘0.3’.to_r isn’t the same as 0.3.to_r. The former is equivalent to ‘3/10’.to_r, but the latter isn’t so.
' 2 '.to_r #=> (2/1) '300/2'.to_r #=> (150/1) '-9.2'.to_r #=> (-46/5) '-9.2e2'.to_r #=> (-920/1) '1_234_567'.to_r #=> (1234567/1) '21 june 09'.to_r #=> (21/1) '21/06/09'.to_r #=> (7/2) 'bwv 1079'.to_r #=> (0/1)
See Kernel.Rational.
Returns the result of interpreting leading characters in str as an integer base base (between 2 and 36). Extraneous characters past the end of a valid number are ignored. If there is not a valid number at the start of str, 0 is returned. This method never raises an exception when base is valid.
"12345".to_i #=> 12345 "99 red balloons".to_i #=> 99 "0a".to_i #=> 0 "0a".to_i(16) #=> 10 "hello".to_i #=> 0 "1100101".to_i(2) #=> 101 "1100101".to_i(8) #=> 294977 "1100101".to_i(10) #=> 1100101 "1100101".to_i(16) #=> 17826049
Returns the result of interpreting leading characters in str as a floating point number. Extraneous characters past the end of a valid number are ignored. If there is not a valid number at the start of str, 0.0 is returned. This method never raises an exception.
"123.45e1".to_f #=> 1234.5 "45.67 degrees".to_f #=> 45.67 "thx1138".to_f #=> 0.0
Returns self.
If called on a subclass of String, converts the receiver to a String object.
Returns the value of float as a BigDecimal. The precision parameter is used to determine the number of significant digits for the result (the default is Float::DIG).
require 'bigdecimal' require 'bigdecimal/util' 0.5.to_d # => 0.5e0 1.234.to_d(2) # => 0.12e1
See also BigDecimal::new.
Returns a string containing a representation of self. As well as a fixed or exponential form of the float, the call may return NaN, Infinity, and -Infinity.
Since float is already a float, returns self.
Returns the value as a rational.
NOTE: 0.3.to_r isn’t the same as ‘0.3’.to_r. The latter is equivalent to ‘3/10’.to_r, but the former isn’t so.
2.0.to_r #=> (2/1) 2.5.to_r #=> (5/2) -0.75.to_r #=> (-3/4) 0.0.to_r #=> (0/1)
See rationalize.
Returns exception’s message (or the name of the exception if no message is set).
Returns a string representing this module or class. For basic classes and modules, this is the name. For singletons, we show information on the thing we’re attached to as well.
Converts the value to a string.
The default format looks like 0.xxxxEnn.
The optional parameter s consists of either an integer; or an optional ‘+’ or ‘ ’, followed by an optional number, followed by an optional ‘E’ or ‘F’.
If there is a ‘+’ at the start of s, positive values are returned with a leading ‘+’.
A space at the start of s returns positive values with a leading space.
If s contains a number, a space is inserted after each group of that many fractional digits.
If s ends with an ‘E’, engineering notation (0.xxxxEnn) is used.
If s ends with an ‘F’, conventional floating point notation is used.
Examples:
BigDecimal.new('-123.45678901234567890').to_s('5F') #=> '-123.45678 90123 45678 9' BigDecimal.new('123.45678901234567890').to_s('+8F') #=> '+123.45678901 23456789' BigDecimal.new('123.45678901234567890').to_s(' F') #=> ' 123.4567890123456789'
Returns the value as an Integer.
If the BigDecimal is infinity or NaN, raises FloatDomainError.
Converts a BigDecimal to a Rational.
Returns a new Float object having approximately the same value as the BigDecimal number. Normal accuracy limits and built-in errors of binary Float arithmetic apply.
Returns self.
require 'bigdecimal/util' d = BigDecimal.new("3.14") d.to_d # => 0.314e1
Returns the value as a BigDecimal.
The required precision parameter is used to determine the number of significant digits for the result.
require 'bigdecimal' require 'bigdecimal/util' Rational(22, 7).to_d(3) # => 0.314e1
See also BigDecimal::new.
Returns the truncated value as an integer.
Equivalent to Rational#truncate.
Rational(2, 3).to_i #=> 0 Rational(3).to_i #=> 3 Rational(300.6).to_i #=> 300 Rational(98,71).to_i #=> 1 Rational(-30,2).to_i #=> -15
Return the value as a float.
Rational(2).to_f #=> 2.0 Rational(9, 4).to_f #=> 2.25 Rational(-3, 4).to_f #=> -0.75 Rational(20, 3).to_f #=> 6.666666666666667
Returns the value as a string.
Rational(2).to_s #=> "2/1" Rational(-8, 6).to_s #=> "-4/3" Rational('1/2').to_s #=> "1/2"
Returns a string in an ISO 8601 format. (This method doesn’t use the expanded representations.)
Date.new(2001,2,3).to_s #=> "2001-02-03"
Returns a string in an ISO 8601 format. (This method doesn’t use the expanded representations.)
DateTime.new(2001,2,3,4,5,6,'-7').to_s #=> "2001-02-03T04:05:06-07:00"