# num_traits::sign::signum - Rust
API documentation for the Rust `signum` fn in crate `num_traits`.
Keywords: rust, rustlang, rust-lang, signum

# [−] [src] Function num_traits::sign::signum

    pub fn signum<T: Signed>(value: T) -> T

Returns the sign of the number.

For `f32` and `f64`:

- `1.0` if the number is positive, `+0.0` or `INFINITY`
- `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
- `NaN` if the number is `NaN`

For signed integers:

- `0` if the number is zero
- `1` if the number is positive
- `-1` if the number is negative

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