class Float < Numeric

Float objects represent real numbers using the native architecture's double-precision floating point representation.

instance methods

Arithmetic operations

Performs various arithmetic operations on flt.

flt	+	aNumeric	Addition
flt	-	aNumeric	Subtraction
flt	*	aNumeric	Multiplication
flt	/	aNumeric	Division
flt	%	aNumeric	Modulo
flt	**	aNumeric	Exponentiation

<=>

flt <=> aNumeric → -1, 0, +1

Returns -1, 0, or +1 depending on whether flt is less than, equal to, or greater than aNumeric. This is the basis for the tests in Comparable.

ceil

flt.ceil → anInteger

Returns the smallest Integer greater than or equal to flt.

1.2.ceil → 2 2.0.ceil → 2 (-1.2).ceil → -1 (-2.0).ceil → -2

finite?

flt.finite? → true or false

Returns true if flt is a valid IEEE floating point number (it is not infinite, and nan? is false).

floor

flt.floor → anInteger

Returns the largest integer less than or equal to flt.

1.2.floor → 1 2.0.floor → 2 (-1.2).floor → -2 (-2.0).floor → -2

infinite?

flt.infinite? → nil, -1, +1

Returns nil, -1, or +1 depending on whether flt is finite, -infinity, or +infinity.

(0.0).infinite? → nil (-1.0/0.0).infinite? → -1 (+1.0/0.0).infinite? → 1

nan?

flt.nan? → true or false

Returns true if flt is an invalid IEEE floating point number.

a = -1.0 → -1.0 a.nan? → false a = Math.log(a) → NaN a.nan? → true

round

flt.round → anInteger

Rounds flt to the nearest integer. Equivalent to:

def round return floor(self+0.5) if self > 0.0 return ceil(self-0.5) if self < 0.0 return 0.0 end

1.5.round → 2 (-1.5).round → -2

to_f

flt.to_f → flt

Returns flt.

to_i

flt.to_i → anInteger

Returns flt truncated to an Integer.

to_s

flt.to_s → aString

Returns a string containing a representation of self. As well as a fixed or exponential form of the number, the call may return “NaN”, “Infinity”, and “-Infinity”.