# Enum std::num::FpCategory

1.0.0 · source ·
``````pub enum FpCategory {
Nan,
Infinite,
Zero,
Subnormal,
Normal,
}``````
Expand description

A classification of floating point numbers.

This `enum` is used as the return type for `f32::classify` and `f64::classify`. See their documentation for more.

## Examples

``````use std::num::FpCategory;

let num = 12.4_f32;
let inf = f32::INFINITY;
let zero = 0f32;
let sub: f32 = 1.1754942e-38;
let nan = f32::NAN;

assert_eq!(num.classify(), FpCategory::Normal);
assert_eq!(inf.classify(), FpCategory::Infinite);
assert_eq!(zero.classify(), FpCategory::Zero);
assert_eq!(sub.classify(), FpCategory::Subnormal);
assert_eq!(nan.classify(), FpCategory::Nan);``````
Run

## Variants§

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### Nan

NaN (not a number): this value results from calculations like `(-1.0).sqrt()`.

See the documentation for `f32` for more information on the unusual properties of NaN.

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### Infinite

Positive or negative infinity, which often results from dividing a nonzero number by zero.

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### Zero

Positive or negative zero.

See the documentation for `f32` for more information on the signedness of zeroes.

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### Subnormal

“Subnormal” or “denormal” floating point representation (less precise, relative to their magnitude, than `Normal`).

Subnormal numbers are larger in magnitude than `Zero` but smaller in magnitude than all `Normal` numbers.

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### Normal

A regular floating point number, not any of the exceptional categories.

The smallest positive normal numbers are `f32::MIN_POSITIVE` and `f64::MIN_POSITIVE`, and the largest positive normal numbers are `f32::MAX` and `f64::MAX`. (Unlike signed integers, floating point numbers are symmetric in their range, so negating any of these constants will produce their negative counterpart.)

## Trait Implementations§

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### impl Clone for FpCategory

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#### fn clone(&self) -> FpCategory

Returns a copy of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Debug for FpCategory

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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### impl PartialEq<FpCategory> for FpCategory

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#### fn eq(&self, other: &FpCategory) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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## Blanket Implementations§

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### impl<T> Any for Twhere T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for Twhere T: ?Sized,

const: unstable · source§

#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for Twhere T: ?Sized,

const: unstable · source§

#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for Twhere U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> ToOwned for Twhere T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T, U> TryFrom<U> for Twhere U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
const: unstable · source§

#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for Twhere U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
const: unstable · source§

#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.