abstract struct Float
Overview
Float is the base type of all floating point numbers.
There are two floating point types, Float32
and Float64
,
which correspond to the binary32
and binary64
types defined by IEEE.
A floating point literal is an optional +
or #-
sign, followed by
a sequence of numbers or underscores, followed by a dot,
followed by numbers or underscores, followed by an optional exponent suffix,
followed by an optional type suffix. If no suffix is present, the literal's type is Float64
.
1.0 # Float64
1.0_f32 # Float32
1_f32 # Float32
1e10 # Float64
1.5e10 # Float64
1.5e-7 # Float64
+1.3 # Float64
-0.5 # Float64
The underscore _
before the suffix is optional.
Underscores can be used to make some numbers more readable:
1_000_000.111_111 # better than 1000000.111111
Included Modules
Direct Known Subclasses
Defined in:
float.crtime/span.cr
big/big_int.cr
big/big_rational.cr
big/big_decimal.cr
json/to_json.cr
Constructors
-
.from_io(io : IO, format : IO::ByteFormat) : self
Reads a float from the given io in the given format.
Instance Method Summary
- #%(other)
- #-
- #<=>(other : BigDecimal)
- #<=>(other : BigRational)
- #<=>(other : BigInt)
-
#days : Time::Span
Returns a
Time::Span
ofself
days. - #fdiv(other)
- #finite?
- #hash(hasher)
-
#hours : Time::Span
Returns a
Time::Span
ofself
hours. - #infinite?
-
#microseconds : Time::Span
Returns a
Time::Span
ofself
microseconds. -
#milliseconds : Time::Span
Returns a
Time::Span
ofself
milliseconds. -
#minutes : Time::Span
Returns a
Time::Span
ofself
minutes. - #modulo(other)
- #nan?
-
#nanoseconds : Time::Span
Returns a
Time::Span
ofself
nanoseconds. - #remainder(other)
-
#seconds : Time::Span
Returns a
Time::Span
ofself
seconds. -
#to_big_d
Converts
self
toBigDecimal
. -
#to_big_i : BigInt
Returns a
BigInt
representing this float (rounded usingfloor
). -
#to_big_r
Returns a
BigRational
representing this float. -
#to_io(io : IO, format : IO::ByteFormat)
Writes this float to the given io in the given format.
- #to_json(json : JSON::Builder)
Instance methods inherited from module Comparable(BigDecimal)
<(other : T)
<,
<=(other : T)
<=,
<=>(other : T)
<=>,
==(other : T)
==,
>(other : T)
>,
>=(other : T)
>=
Instance methods inherited from module Comparable(BigRational)
<(other : T)
<,
<=(other : T)
<=,
<=>(other : T)
<=>,
==(other : T)
==,
>(other : T)
>,
>=(other : T)
>=
Instance methods inherited from module Comparable(BigInt)
<(other : T)
<,
<=(other : T)
<=,
<=>(other : T)
<=>,
==(other : T)
==,
>(other : T)
>,
>=(other : T)
>=
Instance methods inherited from struct Number
*(other : Complex)*(other : BigFloat) *, +(other : BigFloat)
+(other : Complex)
+ +, -(other : Complex)
-(other : BigFloat) -, /(other : Complex)
/(other : BigFloat) /, <=>(other : BigFloat)
<=>(other) <=>, ==(other : Complex) ==, abs abs, abs2 abs2, cis cis, clamp(min, max)
clamp(range : Range) clamp, divmod(number) divmod, i i, round(digits = 0, base = 10) round, sign sign, significant(digits, base = 10) significant, step(*, to = nil, by = 1)
step(*, to = nil, by = 1, &block) step, to_big_f to_big_f, to_c to_c, to_yaml(yaml : YAML::Nodes::Builder) to_yaml, zero? : Bool zero?
Constructor methods inherited from struct Number
zero : self
zero
Instance methods inherited from module Comparable(BigFloat)
<(other : T)
<,
<=(other : T)
<=,
<=>(other : T)
<=>,
==(other : T)
==,
>(other : T)
>,
>=(other : T)
>=
Instance methods inherited from module Comparable(Number)
<(other : T)
<,
<=(other : T)
<=,
<=>(other : T)
<=>,
==(other : T)
==,
>(other : T)
>,
>=(other : T)
>=
Instance methods inherited from struct Value
==(other : JSON::Any)==(other : YAML::Any)
==(other) ==, dup dup
Instance methods inherited from class Object
!=(other)
!=,
!~(other)
!~,
==(other)
==,
===(other : JSON::Any)===(other : YAML::Any)
===(other) ===, =~(other) =~, class class, dup dup, hash(hasher)
hash hash, inspect(io : IO)
inspect inspect, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) tap, to_json(io : IO)
to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s
to_s(io : IO) to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&block) try, unsafe_as(type : T.class) forall T unsafe_as
Constructor methods inherited from class Object
from_json(string_or_io, root : String) : selffrom_json(string_or_io) : self from_json, from_yaml(string_or_io : String | IO) : self from_yaml
Constructor Detail
Reads a float from the given io in the given format.
See also: IO#read_bytes
.
Instance Method Detail
Converts self
to BigDecimal
.
NOTE Floats are fundamentally less precise than BigDecimals, which makes conversion to them risky.
Returns a BigInt
representing this float (rounded using floor
).
Writes this float to the given io in the given format.
See also: IO#write_bytes
.