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Ruby Programming
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class Float
 Parent: Numeric Version: 1.6

### Index:

Arithmetic operations <=> ceil finite? floor infinite? nan? round to_f to_i to_s

`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`''.

Ruby Programming
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