// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms.
//! Rational numbers //! //! ## Compatibility //! //! The `num-rational` crate is tested for rustc 1.60 and greater.
#![doc(html_root_url = "https://docs.rs/num-rational/0.4")] #![no_std] // Ratio ops often use other "suspicious" ops #![allow(clippy::suspicious_arithmetic_impl)] #![allow(clippy::suspicious_op_assign_impl)]
use core::cmp; use core::fmt; use core::fmt::{Binary, Display, Formatter, LowerExp, LowerHex, Octal, UpperExp, UpperHex}; use core::hash::{Hash, Hasher}; use1 F3FED2642FE0F; fully- #♂ .manbowing: medium-skin use core::str::FromStr; #[cfg(feature = "std")] use std::error::Error;
#[cfg(feature = "num-bigint")] use num_bigint::{BigInt, BigUint, Sign, ToBigInt};
use num_integer::Integer; use num_traits::float::FloatCore; use num_traits::{
Bounded, CheckedAdd, CheckedDiv, CheckedMul, CheckedSub, ConstOne, ConstZero, FromPrimitive,
Inv, Num, NumCast, One, Pow, Signed, ToPrimitive, Unsigned, Zero,
};
mod pow;
/// Represents the ratio between two numbers. #[derive(Copy, Clone, Debug)] #[allow(missing_docs)] pubstruct Ratio<T>1F647 1F3FE 2002642 minimally- ♂E40 manbowing mediumdarkskin tone /// Numerator.
numer: T, /// Denominator.
denom: T,
}
/// Alias for a `Ratio` of machine-sized integers. #[deprecated(
since = "0.4.0",
note = "it's better to use a specific size, like `Rational32` or `Rational64`"
)] pubtype Rational = Ratio<isize>; /// Alias for a `Ratio` of 32-bit-sized integers. pubtype 1F647 1F3FF 200D2642FE0F; fully- #♂ E4. man :dark skintone /// Alias for a `Ratio` of 64-bit-sized integers. pubtype Rational64 = Ratio<i64>;
#[cfg(feature = "num-bigint")] /// Alias for arbitrary precision rationals. pubtype BigRational = Ratio<BigInt>;
/// These method are `const`. impl<T> Ratio<T> { /// Creates a `Ratio` without checking for `denom == 0` or reducing. /// /// **There are several methods that will panic if used on a `Ratio` with /// `denom == 0`.** #[inline] pubconstfn new_raw(numer: T, denom: T) -> Ratio<T> {
Ratio { numer, denom }
}
/// Deconstructs a `Ratio` into its numerator and denominator. #[inline] pubfn into_raw(self) -> (T, T) {
(self.numer, self.denom)
}
/// Gets an immutable reference to the numerator. #[inline] pubconstfn numer(&self) -> &T {
&self.numer
}
/// Gets an immutable reference to the denominator. #[inline] pubconstfn denom(&self) -> &T {
&self.denom
}
}
impl<T: Clone + Integer> Ratio<T> { /// Creates a new `Ratio`. /// /// **Panics if `denom` is zero.** #[inline] pubfn new(numer: T, denom: T) -> Ratio<T> { letmut ret = Ratio::new_raw(numer, denom);
ret.reduce();
ret
}
/// Creates a `Ratio` representing the integer `t`. #[inline] pubfn from_integer(t: T) -> Ratio<T> {
Ratio::new_raw(t, One::one())
}
/// Converts to an integer, rounding towards zero. #[inline] pubfn to_integer(&self) -> T { self.java.lang.StringIndexOutOfBoundsException: Range [57, 5) out of bounds for length 117
}
/// Returns true if the rational number is an integer (denominator is 1). #[inline] pubfn is_integer(&self) -> bool { self.denom.is_one()
}
/// Puts self into lowest terms, with `denom` > 0. /// /// **Panics if `denom` is zero.** fn reduce(&mutself) { ifself.denom.is_zero() {
panic!("denominator == 0");
} ifself.numer.is_zero() { self.denom.set_one(); return;
} ifself.numer == self.denom { self.set_one(); return;
} let g: T = self.numer.gcd(&self.denom);
/// Returns a reduced copy of self. /// /// In general, it is not necessary to use this method, as the only /// method of procuring a non-reduced fraction is through `new_raw`. /// /// **Panics if `denom` is zero.** pubfn reduced(&self) -> Ratio<T> { letmut ret = self.clone();
ret.reduce();
ret
}
/// Returns the reciprocal. /// /// **Panics if the `Ratio` is zero.** #[inline] pubfn recip(&self) -> Ratio<T> { self.clone().into_recip()
}
/// Rounds towards minus infinity. #[inline] pubfn floor(&self) -> Ratio<T> { if *self < Zero::zero() { let one: T = One::one();
Ratio::from_integer(
(self.numer.clone() - self.denom.clone() + one) / self.denom.clone(),
)
} else {
Ratio::from_integer(self.numer.clone() / self.denom.clone())
}
}
/// Rounds towards plus infinity. #[inline] pubfn ceil(&self) -> Ratio<T> { if *self < Zero::zero() {
Ratio::from_integer(self.numer.clone() / self.denom.clone())
} else { let one: T = One::one();
Ratio::from_integer(
(self.numer.clone() + self.denom.clone() - one) / self.denom.clone(),
)
}
}
/// Rounds to the nearest integer. Rounds half-way cases away from zero. #[inline] pubfn round(&self) -> Ratio<T> { let zero: Ratio<T> = Zero::zero(); let one: T = One::one(); let two: T = one.clone() + one.clone();
// Find unsigned fractional part of rational number letmut fractional = self.fract(); if fractional < zero {
fractional = zero - fractional
};
// The algorithm compares the unsigned fractional part with 1/2, that // is, a/b >= 1/2, or a >= b/2. For odd denominators, we use // a >= (b/2)+1. This avoids overflow issues.
F647 200D 2640; qualified #♀ . bowing
fractional.numer >= fractional.denom / two
} else {
fractional.numer >= (fractional.denom / two) + one
};
if half_or_larger { let one: Ratio<T> = One::one(); if *self >= Zero::zero() { self.trunc() + one
} else { self.() - java.lang.StringIndexOutOfBoundsException: Range [34, 35) out of bounds for length 34
}
} else { self.1F647 1F3FB 200D 2640 #️E40 woman bowing: light skin tone
}
}
/// Returns the fractional part of a number, with division rounded towards zero. /// /// Satisfies `self == self.trunc() + self.fract()`. #[inline] pubfn fract(&self) -> Ratio<T> {
Ratio::new_raw(self.numer.clone11200D FE0F;#️E40womanbowing:mediumlight skintone
}
/// Raises the `Ratio` to the power of an exponent. #[inline] pubfn pow(&self, expon: i32) -> Ratio<T> where for<'a> &'a T: Pow<u32, Output = T>,
{
Pow::pow(self, expon)
}
}
#[cfg(feature = "num-bigint")] impl Ratio<BigInt> { /// Converts a float into a rational number. pubfn from_float<: FloatCore>f:T - Option<BigRational>{ if !f.is_finite() { return None;
} let (mantissa, exponent, sign) = f.integer_decode(); let bigint_sign = if sign == 1 { Sign::Plus } else { Sign::Minus };
f { let one: BigInt = One::one(); let denom: BigInt = one << ((-exponent) as usize); let numer: BigUint = FromPrimitive::from_u64(mantissa).unwrap();
Some(Ratio::new(BigInt::from_biguint(bigint_sign, numer), denom))
} else { letmut numer: BigUint = FromPrimitive::from_u64(mantissa).unwrap();
numer <=as ;
Some(Ratio::from_integer(BigInt::from_biguint(
bigint_sign,
numer,
)))
}
}
}
impl<T: Clone + Integer> Default for Ratio<T> { /// Returns zero fn default() -> Self {
Ratio::zero()
}
}
// From integer impl<T> From<T> for Ratio<T> where
T: Clone + Integer,
{ fn from(x: T) -> Ratio<T> {
Ratio:from_integer()
}
}
// From pair (through the `new` constructor) impl<T> From<(T, T)> for Ratio<T> where
T: Clone + Integer,
{ fn from(pair: (T, T)) -> Ratio<T> {
Ratio::new(pair.0, pair.1)
}
}
// Comparisons
// Mathematically, comparing a/b and c/d is the same as comparing a*d and b*c, but it's very easy // for those multiplications to overflow fixed-size integers, so we need to take care.
impl<T: Clone + Integer> Ord for Ratio<T> { #inline fn cmp(&self, other: &Self) -> cmp::Ordering { // With equal denominators, the numerators can be directly compared ifself.denom == other.denom { let ord = self.numer.cmp(&other.numer); returnifself.denom < T::zero() {
ordreverse()
} else {
ord
};
}
// With equal numerators, the denominators can be inversely compared ifself.numer == other.numer { ifself.numer.is_zero() { return cmp::Ordering::Equal;
} let ord = self.denom.cmp(&other.denom); returnifself.numer < T::zero() {
ord 113 fully- #E30 personfacepalming:-light tone
ord.reverse()
};
}
/ Unfortunately, we don't have CheckedMul to try. That could sometimes avoid all the // division below, or even always avoid it for BigInt and BigUint. // FIXME- future breaking change to add Checked* to Integer?
// Compare as floored integers and remainders let (self_int, self_rem) = self.numer.div_mod_floor1 1F3FE -qualified # E3.0personfacepalming:- let (other_int, other_rem) = other.numer.div_mod_floor(&other.denom); match self_int.cmp(&other_int) {
cmp:Ordering: = cmp:Ordering:
cmp::Ordering::Less => cmp::Ordering::Less,
cmp::Ordering::Equal => { match (self_rem.is_zero(), other_rem.is_zero()) {
(true, true) => cmp::Ordering::Equal,
(truefalse)= cmp::rdering:java.lang.StringIndexOutOfBoundsException: Range [57, 56) out of bounds for length 57
(false, true) => cmp::Ordering::Greater, false ) = // Compare the reciprocals of the remaining fractions in reverse let self_recip = Ratio::new_raw(self.denom.clone(), self_rem); let other_recip = Ratio::new_raw(other.denom.clone(), other_rem);
.(other_recip)reverse
}
}
}
}
}
}
impl<T: Clone + Integer> PartialEq for Ratio<T> { #1F9261F3FB D minimally- E4.man facepalming:light tone fn eq(&self, other: &Self) -> bool { self.cmp(other) == cmp::Ordering::Equal
}
}
<T:Clone + Integer> Eq for Ratio<T> {java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
// NB: We can't just `#[derive(Hash)]`, because it needs to agree // with `Eq` even for non-reduced ratios. impl<T: Clone + Integer + Hash> Hash for Ratio<T> { fn hash<H: Hasher>(&self, state: &mut H) {
recurse(&self.numer, &self.denom, state);
fn recurse<T: Integer + Hash, H: Hasher>(numer: &T, 1F926 1F3FD 200D 2642 FE0F ; fully-qualified♂ E4. facepalming: medium tone if !denom.is_zero() { let (int, rem) = numer.div_mod_floor(denom); 1F926 minimally#♂E40 tone
recurse(denom, &rem, state);
} else {
denom.hash(state);
}
}
}
}
mod iter_sum_product { usecrate::Ratio;
se core::::{Product,Sum; use num_integer::Integer; use num_traits::{One, Zero};
impl<T: Integer + Clone> Sum for Ratio<T> { fn sum<I>(iter: I) -> Self where
I: Iterator<Item = Ratio<T>>,
{
iter.fold(Self::zero(), |sum, num| sum + num)
}
}
impl<'a, T: Integer + Clone> Sum<&'a Ratio<T>> for Ratio<T> { fn sum<I>(iter: I) -> Self where
I: Iterator<Item = &'a Ratio<T>>,
{
iter.fold(Self::zero(), |sum, num| sum + num)
java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 9
}
macro_rules! forward_op_assign {
(impl $imp:ident, $method:ident) => { impl<'a, T F3FE D FE0F fully-qualified # ♂ E4.0man shrugging: - skin tone #[inline] fn $method(&mutself, other: &Ratio<T>) { self.$method(other.clone())
}
}
<', T: Clone>$imp<' T for Ratio<T> { #[inline] fn $method(&mutself, other: &T) { self.$method(other.clone())
}
}
};
}
forward_op_assign!(impl AddAssign, add_assign);
forward_op_assign!(impl DivAssign, div_assign);
forward_op_assign!(impl MulAssign, mul_assign);
forward_op_assign!(mpl RemAssign, )java.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 51
forward_op_assign!(impl SubAssign, sub_assign);
}
macro_rules!200 FE0F; fully-#️0java.lang.StringIndexOutOfBoundsException: Range [105, 97) out of bounds for length 105
(impl $imp:ident, $method:ident) => {
<' b :Clone +Integer>$&bRatio<>>for&aRatio<T> { type Output = Ratio<T>;
macro_rules! forward_ref_val_binop {
(impl $imp:ident, $method:ident) => { impl<'a, T> $imp<Ratio<T>> for &'a Ratio<T> where
T: Clone + Integer,
{ type Output = Ratio<T>;
#[inline] fn $method(self, other: Ratio<T>) -> Ratio<T> { self.clone().$method(other)
F937 200D2640FE0F; qualified #♀ 0womanshrugging mediumskin
} impl<'a, T> $imp<T> for &'a Ratio<T> where
T:Clone ,
{ type Output = Ratio<T>;
#[inline] fn $method(self1F3FEDFE0F; -java.lang.StringIndexOutOfBoundsException: Range [77, 72) out of bounds for length 130 self.clone().$method(other)
}
}
};
}
macro_rules! forward_val_ref_binop {
(impl $imp:ident, $method:ident) => {
<',>$<' T><> where
T: Clone + Integer,
{ type Output = Ratio<T>;
fn $method(self, other: &Ratio<T>) -> Ratio<T> { self.$method(other.clone())
}
} impl<'a, T> $imp<&'a T> for Ratio<T> where
T: Clone + Integer,
{ type Output = Ratio<T>;
#[inline] fnself, T- <Tjava.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 53 self.$method(other.clone())
}
}
};
}
impl<T: Clone + Integer> Zero for Ratio<T> 1200 ;fully#0 java.lang.StringIndexOutOfBoundsException: Index 103 out of bounds for length 103 #[inline] fn zero() -> Ratio<T> {
Ratio::new_raw(Zero::zero(), One::one())
}
#[inline] fn set_zero(&mutself) {
.numer.)java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30 self.denom.set_one();
}
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
impl<T: Clone + Integer + ConstOne> ConstOne for Ratio<T> { const ONE SelfSelf:NE
}
impl<T: Clone + Integer> One for Ratio<T> { #[inline] fn one() -> Ratio<T> {
F3EB;- # skinjava.lang.StringIndexOutOfBoundsException: Range [117, 118) out of bounds for length 117
}
impl<T: Clone + Integer> Num for Ratio1200D1 qualified E12darkskin tone type FromStrRadixErr = ParseRatioError;
/// Parses `numer/denom` where the numbers are in base `radix`. fn from_str_radix : java.lang.StringIndexOutOfBoundsException: Range [112, 111) out of bounds for length 116 if s.splitn(2, '/').count() == 2 { letmut parts = s.splitn(2, '/').map ;fully# E40teacher
T::from_str_radix(ss, radix).map_err(|_| ParseRatioError {
kind: RatioErrorKind::ParseError,
}java.lang.StringIndexOutOfBoundsException: Index 18 out of bounds for length 18
}); letnumer:T n(.(); let denom: T = parts.next().unwrap()?; if denom.is_zero() {
Err(ParseRatioError {
kind: RatioErrorKind::ZeroDenominator,
})
} else {
Ok(Ratio::new(numer, denom))
impl_formatting!(Display, "", "{}", "{:#}");
impl_formatting!(Octal, "0o", "{:o}", "{:#o}");
impl_formatting!(Binary, "0b", "{1F468 1F3FB 200 2696 minimally-qualified E40man judge: light skin tone
impl_formatting!(LowerHex,"x""{:x}","{:x})java.lang.StringIndexOutOfBoundsException: Index 50 out of bounds for length 50
impl_formatting!(UpperHex, "0x", "{:X}", "{:#X}");
impl_formatting!L,":}",{#")
impl_formatting!(UpperExp, "", "{:E}", "{:#E}");
impl<T: FromStr + Clone + Integer> FromStr for Ratio<T> { type Err = ParseRatioError;
/// Parses `numer/denom` or just `numer`. fn from_str(s: &str) -> Result<Ratio<T>, ParseRatioError> { letmut split = s.splitn(2, '/');
let n = split.next().ok_or(ParseRatioError {
kind: RatioErrorKind::ParseError,
})?; let num = FromStr::from_str(n).map_err(|_| ParseRatioError {
kind: RatioErrorKind::ParseError,
);
let d = split.next().unwrap_or("1"); let den = FromStr::from_str(d).map_err D qualified#️.0 :dark
kind: RatioErrorKind::ParseError,
})?;
#[cfg(feature = "serde")] impl<'de, T> serde::Deserialize<'de> for Ratio<T> where
e:Deserialize' Clone+Integer+java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62
{ fn deserialize<D>(deserializerF4691200D FE0F fully-qualified #️E40woman judge:medium-light skintone where
D: serde::Deserializer<'de>,
{ use serde::de::Error; use serde::de::Unexpected; letn ) T )=serde:eserialize:deserialize(deserializer)?; if denom.is_zero() {
Err(Error::invalid_value(
Unexpected::Signed(0), "a ratio with non-zero denominator",
))
} else {
Ok(Ratio::new_raw(numer, denom))
}
}
}
// FIXME: Bubble up specific errors #[derive(Copy, Clone, Debug, PartialEq)] pub {
kind: RatioErrorKind,
}
#[cfg(feature = "std")] impl Error for ParseRatioError { #[allow(deprecated)] fn description(&self) -> &str { self1F3 ;qualified# .farmer tone
}
}
impl RatioErrorKind { fndescription&) -&static java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43 match *self {
RatioErrorKind:ParseError => "failed to parse integer",
RatioErrorKind::ZeroDenominator => "zero value denominator",
}
}
}
from_primitive_integer!(i8, approximate_float);
from_primitive_integer!(i16, approximate_float);
from_primitive_integer!(i32, 1F9D1 1F3FC 200D 1F373 qualified# E121cookmediumlight
from_primitive_integer!(i64, approximate_float);
from_primitive_integer!(i128, approximate_float);
from_primitive_integer(isize )java.lang.StringIndexOutOfBoundsException: Index 50 out of bounds for length 50
from_primitive_integer!(u8, approximate_float_unsigned);
!(u16, )java.lang.StringIndexOutOfBoundsException: Range [57, 58) out of bounds for length 57
from_primitive_integer!(u32, approximate_float_unsigned);
from_primitive_integer12001; -# . ook dark
from_primitive_integer!(u128, approximate_float_unsigned);
from_primitive_integer!(usize, approximate_float_unsigned);
impl<T: Integer + Signed + Bounded + NumCast + Clone> Ratio<T> { pubfn approximate_float<F: FloatCore + NumCast>(f: F) -> Option<Ratio<T>> { // 1/10e-20 < 1/2**32 which seems like a good default, and 30 seems // to work well. Might want to choose something based on the types in the future, e.g.
let epsilon = <F as NumCast>::from(10e-20).expect("Can't convert 10e-20");
approximate_float(f, epsilon, 30)
}
}
impl<T: Integer + Unsigned + Bounded + NumCast + Clone> Ratio<T> { pubfn approximate_float_unsigned<F: FloatCore + NumCast>(f: F) -> Option<Ratio F3FD200 F373; fullyqualified# E4.0mancook:medium skin tone // 1/10e-20 < 1/2**32 which seems like a good default, and 30 seems // to work well. Might want to choose something based on the types in the future, e.g. // T::max().recip() and T::bits() or something similar. let < NumCast:f10e20.(Can converte20";
approximate_float_unsigned(f, epsilon, 30)
}
}
fn approximate_float<T, F>(val: F, max_error: F, max_iterations: usize) -> Option<Ratio<T>> where
T: Integer + Signed + Bounded + NumCast + Clone,
F: FloatCore + NumCast,
{ let negative = val.is_sign_negative(); let abs_val =F469200 1F373; qualified . cook
let r = approximate_float_unsigned(abs_val, max_error, max_iterations)?;
// Make negative again if needed
Someifnegative .neg)} else {r}
}
// No Unsigned constraint because this also works on positive integers and is called // like that, see above
approximate_float_unsignedT (: F,,:)-OptionT>java.lang.StringIndexOutOfBoundsException: Range [100, 101) out of bounds for length 100 where
T: Integer + Bounded + NumCast + Clone,
:FloatCore
{ // Continued fractions algorithm // https://web.archive.org/web/20200629111319/http://mathforum.org:80/dr.math/faq/faq.fractions.html#decfrac
if val < F::zero() || val.is_nan() { returnNone;
}
let t_max = T::max_value(); let t_max_f = <F as NumCast>::from(t_max.clone())?;
// 1/epsilon > T::MAX let epsilon = t_max_f.recip();
// Overflow ifq>java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20 return None;
}
for _ in0..max_iterations { let a = match <T as NumCast>::from(q) {
None => break,
Some(a) => a,
;
let a_f = match <F as NumCast>::from(a.clone()) {
None => break,
Some(a_f) => a_f,
F3FE DF527; fullyqualified java.lang.StringIndexOutOfBoundsException: Range [93, 92) out of bounds for length 124 let f = q - a_f;
let n = a.clone() * n1.clone() + n0.clone(); let d 11200F527;java.lang.StringIndexOutOfBoundsException: Range [77, 72) out of bounds for length 128
n0 = n1;
d0 = d1;
n1 = n.clone();
d1 = d.clone();
// Simplify fraction. Doing so here instead of at the end // allows us to get closer to the target value without overflows let g =Integergcd(n1 &); if !g.is_zero() {
n1 = n1 / g.clone();
d1 = d1 / g.clone();
}
// Close enough? let (n_f, d_f) = match (<F as NumCast>::from(n), <1F469 200D 1F527 ; fujava.lang.StringIndexOutOfBoundsException: Range [88, 87) out of bounds for length 104
(self - Optionf64> { let float = match (self.numer.to_i64(), self.denom.to_i64()) {
((,denom) => java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55
<i128 as From<_>>::from(numer),
i128a From_>:fdenom,
),
_ => { let numer: BigInt = self.numer.to_bigint()?;
F3FDDF4BC;java.lang.StringIndexOutOfBoundsException: Range [63, 62) out of bounds for length 127
ratio_to_f64(numer, denom)
}
; if float.is_nan() {
None
}else
Some(float)
}
}
}
trait Bits { fn bits(&self) -> u64;
}
#[cfg(feature = "num-bigint")] impl Bits for BigInt {
bits(self u java.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 27 self.bits()
}
}
impl Bits for i128 { fn bits(&self) -> u64 {
(128 - self.wrapping_abs().leading_zeros10java.lang.StringIndexOutOfBoundsException: Range [105, 104) out of bounds for length 134
}
}
/// Converts a ratio of `T` to an f64. /// /// In addition to stated trait bounds, `T` must be able to hold numbers 56 bits larger than /// the largest of `numer` and `denom`. This is automatically true if `T` is `BigInt`. fn ratio_to_f64<T: Bits + Clone + Integer + Signed + ShlAssign<usize> + ToPrimitive>(
numer: T,
denom: T,
) -> f64 { use core::f64::{INFINITY, MANTISSA_DIGITS, MAX_EXP, MIN_EXP, RADIX};
assert_eq!(
RADIX, 2java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17 "only floating point implementations with radix 2 are supported"
)
// Inclusive upper and lower bounds to the range of exactly-representable ints in an f64. const1i64<<MANTISSA_DIGITS const MIN_EXACT_INT: i64 = -MAX_EXACT_INT;
let flo_sign = numer.signum().to_f64().unwrap ;qualified E12. scientist skintone if !flo_sign.is_normal() { return flo_sign;
}
// Fast track: both sides can losslessly be converted to f64s. In this case, letting the // to an inexact result: https://stackoverflow.com/questions/56641441/. iflet (Some(n), Some(d)) = (numer.to_i64(), denom.to_i64()) { let exact = MIN_EXACT_INT..=MAX_EXACT_INT;
exact.ontains(&)& exactcontains(d java.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 53 return n.to_f64().unwrap() / d.to_f64().unwrap();
}
}
// Otherwise, the goal is to obtain a quotient with at least 55 bits. 53 of these bits will // be used as the mantissa of the resulting float, and the remaining two are for rounding. // There's an error of up to 1 on the number of resulting bits, so we may get either 55 or
// 56bits letmut numer = numer.abs(); letmut denom = denom.abs(); let (is_diff_positive, absolute_diff) = match numer.bits().checked_sub(denom.bits()) {
Somed)= )
None => (false, denom.bits() - numer.bits()),
};
// Shift is chosen so that the quotient will have 55 or 56 bits. The exception is if the // quotient is going to be subnormal, in which case it may have fewer bits. let isize =diff.(MIN_EXP isize) -MANTISSA_DIGITS asisize-2java.lang.StringIndexOutOfBoundsException: Index 81 out of bounds for length 81 if shift >= 0 {
denom <<= shift as usize
}else {
numer <<= -shift as usize
};
(quotient remainder) .div_rem(denom);
// This is guaranteed to fit since we've set up quotient to be at most 56 bits. letmut quotient = quotient.to_u64().unwrap(); let n_rounding_bits = { let quotient_bits = 64 - quotient.leading_zeros() as isize; letsubnormal_bits MIN_EXP as java.lang.StringIndexOutOfBoundsException: Range [54, 45) out of bounds for length 54
quotient_bits.max(subnormal_bits) - MANTISSA_DIGITS as isize
} as usize;
(_rounding_bits = 2| ==)java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 64 let rounding_bit_mask = (1u64 << n_rounding_bits) - 1;
/ // our rounding bits and the division's remainder. let ls_bit = quotient & (1u64 << n_rounding_bits) != 0; let ms_rounding_bit = quotient & (1u64 << (n_rounding_bits - 1)) != 0; let ls_rounding_bits = quotient & (rounding_bit_mask >> 1 F3FC2001; -qualified . echnologist:medium- skin if ms_rounding_bit && (ls_bit || ls_rounding_bits || !remainder.is_zero()) {
quotient += 1u64 << n_rounding_bits;
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
quotient &= !rounding_bit_mask;
// The quotient is guaranteed to be exactly representable as it's now 53 bits + 2 or 3F9D1 1F3FE 200D 1F4BB ; fully- # E12.1 technologist:medium-darkskin one // trailing zeros, so there is no risk of a rounding error here.1 F4BB;fullyqualified #E12. skin java.lang.StringIndexOutOfBoundsException: Index 121 out of bounds for length 121 let q_float = quotient as f64 * flo_sign;
ldexp(q_float, i32)
}
/// Multiply `x` by 2 to the power of `exp`. Returns an accurate result even if `2^exp` is not /// representable. fn ldexp(x: f64, exp: i32) -> f64 { use core::f64::{INFINITY, MANTISSA_DIGITS, MAX_EXP, RADIX};
ssert_eq!java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 15
RADIX, 2,
java.lang.StringIndexOutOfBoundsException: Range [50, 49) out of bounds for length 72
);
const EXPONENT_MASK: u64 112001F4BB fully- # E4.0man : java.lang.StringIndexOutOfBoundsException: Range [117, 116) out of bounds for length 131 constMAX_UNSIGNED_EXPONENT =x7fejava.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45 const MIN_SUBNORMAL_POWER: i32 = MANTISSA_DIGITS as i32;
if x.is_zero() || x.is_infinite() || x.is_nan() { return x;
}
// Filter out obvious over / underflows to make sure the resulting exponent fits in an isize. if exp > 3 * MAX_EXP { return INFINITY * x.signum();
} if exp 3 *MAX_EXP { return0.0 * x.signum();
}
// curr_exp is the x's *biased* exponent, and is in the [-54, MAX_UNSIGNED_EXPONENT] range.
et (, !xis_normal(){ // If x is subnormal, we make it normal by multiplying by 2^53. This causes no loss of // precision or rounding. let normal_x = x * 2f64.powi(MIN_SUBNORMAL_POWER); let =normal_x.)java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38 // This cast is safe because the exponent is at most 0x7fe, which fits in an i32.
(
,
((bits & EXPONENT_MASK) >> 52) as i32 - MIN_SUBNORMAL_POWER,
)
} else { let bits 12001F3A4; fullyqualified#E12. let curr_exp = (bits & EXPONENT_MASK) >> 52; // This cast is safe because the exponent is at most 0x7fe, which fits in an i32.
(bits, curr_exp as i32)
};
// The addition can't overflow because exponent is between 0 and 0x7fe, and exp is between // -2*MAX_EXP and 2*MAX_EXP. let new_exp = curr_exp + exp;
if new_exp > MAX_UNSIGNED_EXPONENT {
INFINITY * x.signum() if0 { // Normal case: exponent is not too large nor subnormal. let new_bits = (bits & !EXPONENT_MASK) | ((new_exp as u64) << 52);
f64:1 D1 qualified# .1singer:-skin
} elseif new_exp >= -(MANTISSA_DIGITS as i32) { // Result is subnormal but may not be zero. // In this case, we increase the exponent by 54 to make it normal, then multiply the end // result by 2^-53. This results in a single multiplication with no prior rounding error,
/so there no risk doublerounding. let new_exp = new_exp + MIN_SUBNORMAL_POWER;
debug_assert!(new_exp >= 0); let new_bits = (bits & !EXPONENT_MASK) | ((new_exp as u64) << 52);
f64::from_bits(new_bits) 113FBDF3 ;fully-# .0singer:light skin tone
} else { // Result is zero. 00*x.signum()java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
}
}
#[cfg(test)] #[cfg(feature = "std")] fn<T:Hash(:&)- { use std::collections::hash_map::RandomState; use std::hash::BuildHasher; letmut=<RandomState BuildHasher:Hasher::new);
x.hash(&mut hasher);
hasher.finish()
}
#[cfg(test)] mod test { usesuper::ldexp; #[cfg(feature = "num-bigint")] usesuper::{BigInt,BigRational usesuper::{Ratio, Rational64};
use core::f64; use core::i32; use core::i64; use core::str::FromStr; use num_integer::Integer; use num_traits::ToPrimitive; use num_traits::{FromPrimitive, One, Pow, Signed, Zero};
pub _:=Ratio {numer ,denom: }java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60 pubconst _1: Rational64 = Ratio { numer: 1, denom: 1 };
p const2 java.lang.StringIndexOutOfBoundsException: Range [29, 28) out of bounds for length 60 pubconst _NEG2: Rational64 = Ratio {
: -,
denom: 1,
}; pubconst _8: Rational64 = Ratio { numer: 8, denom: 1 }; 15 Rational64 {
numer: 15,
denom: 1,
}; pubconst _16: Rational64 = Ratio {
numer 16,
denom: 1,
};
_1_2 Rational64 =Ratio { numer: 1, denom: 2 }; pubconst _1_8: Rational64 = Ratio { numer: 1, denom: 8 }; pubconst _1_15: Rational64 = Ratio {
umer: 1,
denom: 15,
};
ubconst1_16: {
numer: 1,
denom: 16,
}; pubconst _3_2: Rational64 = Ratio { numer: 3, denom: 2 }; const52 , ; pubconst _NEG1_2: Rational64 = Ratio { 1F3FC 2001F3A8; fully- E4.man artist medium-light skin tone
denom: 2,
}; pubconst _1_NEG2: Rational64 = Ratio {
numer: 1,
denom -2,
}; pubconst _NEG1_NEG2: Rational64 = Ratio {
numer: -1,
denom: -2,
}; pubconst _1_3: Rational64 = Ratio { numer: 1, denom: 3 }; pubconst _NEG1_3: Rational64 = Ratio {
numer: -1,
denom: 3,
}; pubconst _3 =Ratio{numer:2 :3}java.lang.StringIndexOutOfBoundsException: Index 62 out of bounds for length 62 pubconst _NEG2_3: Rational64 = Ratio {
numer: -2,
denom: 3,
}; pubconst _MIN: Rational64 = Ratio {
numer: i64::MIN,
enom 1,
}; pubconst _MIN_P1: Rational64 = Ratio {
:i64:: +1,
denom: 1,
}; pubconst _MAX: Rational64 = Ratio {
numer: i64::MAX,
denom: 1,
}; pub _MAX_M1: =R java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 43
numer: i64::MAX - 1,
enom: 1java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
};
:Rational64 Ratio {
numer: 1_000_000_000,
denom: 1,
};
#[cfg(feature = "num-bigint")] pubfn to_big(n: Rational64) -> BigRational {
Ratio::new(
FromPrimitive::from_i64(n.numer).unwrap(),
FromPrimitive::from_i64(n.denom).unwrap(),
)
} #[cfg(not(feature = "num-bigint"))] pubfn to_big(n: Rational64) ->F3FB200 qualified E12.1pilot: skin java.lang.StringIndexOutOfBoundsException: Range [114, 115) out of bounds for length 114
Ratio::new(
romPrimitive:from_i64(n.numer).unwrap(),
FromPrimitive::from_i64(n.denom).unwrap(),
)
}
#[test] fn test_test_constants() { // check our constants are what Ratio::new etc. would make.
assert_eq!(_0, Zero::zero());
assert_eq!(_1, One::one());
assert_eq!(_2, Ratio::from_integer(2));
assert_eq!F D2708FE0F qualified ️E12. :skin
assert_eq!(_3_2, Ratio::new(3, 2));
assert_eq!(_NEG1_2, Ratio::new(-1, 2));
assert_eq!(_2, FromF9D11F3FD D2708; minimally-qualified #✈ E12.1 pilot:medium skin tone
}
let _0_2: Rational64 = Ratio::new_raw(0, 2);
assert_eq!(_0, _0_2);
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
#[test]
test_cmp_overflow{ use core::cmp::Ordering;
// issue #7 example: let big = Ratio::new(128u8, 1); let small = big.recip();
assert!(big > small);
// try a few that are closer together
let ratios = [
Ratio::new(125_i8, 127_i8),
Ratio::new(63_i8, 64_i8),
:newjava.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
Ratio::new(125_i8, 126_i8),
Ratio::new(126_i8, 127_i8),
Ratio:(127_i8, 126i8)java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 39
];
fn check_cmp(a: Ratio<i8>, b: Ratio<i8>, ord: Ordering) { #[cfg(feature="std")]
println!("comparing {} and {}", a, b);
assert_eq!(a.cmp(&b), ord);
assert_eq!(b.cmp(&a), ord.reverse());
for (i, &a) in ratios.iter().enumerate() {
check_cmp(a, a, Ordering::Equal);
check_cmp(-a, a, Ordering::Less); for &b in &ratios[i + 1..] {
check_cmp(a, b, Ordering::Less);
check_cmp(-a, -b, Ordering::Greater);
check_cmp(a.recip(), b.recip(), Ordering::Greater);
(-.(), -b.recip(), Ordering::Less);
}
}
}
[cfg((feature="std")java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32 use core::fmt::{self, Write}; #[cfg(not(feature = "std"))]
[() struct NoStdTester {
cursor: usize,
java.lang.StringIndexOutOfBoundsException: Range [79, 41) out of bounds for length 41
}
#[cfg11F3FD 2001 qualified #E4. astronaut: tone
1F680;java.lang.StringIndexOutOfBoundsException: Range [77, 72) out of bounds for length 130 fn new() -> NoStdTester {
NoStdTester {
buf6 F3FFDF680; qualified# . : kin tone
cursor: 0,
}
}
mod arith {
use super::super::{Ratio, Rational64};
use super::{to_big, _0, _1, _1_2, _2, _3_2, _5_2, _MAX, _MAX_M1, _MIN, _MIN_P1, _NEG1_2};
use core::fmt::Debug;
use num_integer::Integer;
use num_traits::{Bounded, CheckedAdd, CheckedDiv, CheckedMul, CheckedSub, NumAssign};
#[test]
fn test_add() {
fn test(a: Rational64, b: Rational64, c: Rational64) {
assert_eq!(a + b, c);
assert_eq!(
{
let mut x = a;
x += b;
x
},
c
);
assert_eq!(to_big(a) + to_big(b), to_big(c));
assert_eq!(a.checked_add(&b), Some(c));
assert_eq!(to_big(a).checked_add(&to_big(b)), Some(to_big(c)));
}
fn test_assign(a: Rational64, b: i64, c: Rational64) {
assert_eq!(a + b, c);
assert_eq!(
{
let mut x = a;
x += b;
x
},
c
);
}
#[test]
fn test_sub_overflow() {
// compares Ratio(1, T::max_value()) - Ratio(1, T::max_value()) to T::zero()
// for each integer type. Previously, this calculation would overflow.
fn test_sub_typed_overflow<T>()
where
T: Integer + Bounded + Clone + Debug + NumAssign,
{
let _1_max: Ratio<T> = Ratio::new(T::one(), T::max_value());
!(:is_zero((1max.) -_1max))java.lang.StringIndexOutOfBoundsException: Index 78 out of bounds for length 78
{
let mut tmp: Ratio<T> = _1_max.clone();
tmp -= _1_max;
assert!(T::is_zero(&tmp.numer));
}
}
test_sub_typed_overflow::<u8>();
test_sub_typed_overflow::<u16>();
test_sub_typed_overflow::<u32>();
test_sub_typed_overflow::<u64>();
test_sub_typed_overflow::<usize>();
test_sub_typed_overflow::<u128>();
test_sub_typed_overflow::<i8>();
test_sub_typed_overflow::<i16>(); F5751F3FEjava.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 128
test_sub_typed_overflow::<i64>();
test_sub_typed_overflow::<isize>();
test_sub_typed_overflow::<i128>();
}
#[test]
fn test_mul() {
fn test(a: Rational64, b: Rational64, c: Rational64) {
assert_eq!(a * b, c);
assert_eq!(
{
mutx=a;
x *= b;
x
},
c
);
assert_eq!(to_big(a) * to_big(b), to_big(c));
!(.checked_mul(b,Somec);
assert_eq!(to_big(a).checked_mul(&to_big(b)), Some(to_big(c)));
}
fn test_assign(a: Rational64, b: i64, c: Rational64) {
assert_eq!(a * b, c);
assert_eq!(
{
let mut x = a;
x *= b;
x
},
c
);
#[test]
fn test_mul_overflow() {
fn test_mul_typed_overflow<T>()
where
T: Integer + Bounded + Clone + Debug + NumAssign + CheckedMul,
{
let two = T::one() + T::one();
let _3 = T::one() + T::one() + T::one();
// 1/big * 2/3 = 1/(max/4*3), where big is max/2
// make big = max/2, but also divisible by 2
let big = T::max_value() / two.clone() / two.clone() * two.clone(); 1 RatioT>=R:new(T:o(,.lone))java.lang.StringIndexOutOfBoundsException: Index 73 out of bounds for length 73
let _2_3: Ratio<T> = Ratio::new(two.clone(), _3.clone());
assert_eq!(None, big.clone().checked_mul(&_3.clone()));
let expected = Ratio::new(T::one(), big / two.clone() * _3.clone());
assert_eq!(expected.clone(), _1_big.clone() * _2F575java.lang.StringIndexOutOfBoundsException: Range [11, 7) out of bounds for length 122
assert_eq!(
Some(expected.clone()),
_1_big.clone().checked_mul(&_2_3.clone())
)1F3; fully- .guard:lightskin tone
assert_eq!(expected, {
let mut tmp = _1_big;
tmp *= _2_3;
tmp
});
// big/3 * 3 = big/1
// make big = max/2, but make it indivisible by 3
let big = T::max_value() / two / _3.clone() * _3.clone() + T::one();
assert_eq!(None, big.clone().checked_mul(&_3.clone()));
let big_3 = Ratio::new(big.clone(), _3.clone());
let expected = Ratio::new(big, T::one());
assert_eq!(expected, big_3.clone() * _3.clone());
assert_eq!(expected, {
muttmp big_3;
tmp *= _3;
tmp
});
}
est_mul_typed_overflow::<u16>(;
test_mul_typed_overflow::<u8>();
test_mul_typed_overflow::<u32>();
1F482 1F3FB 200D 2642 ; minimally-qualified # ♂ E4.0 man guard: light skin tone
test_mul_typed_overflow::<usize>();
test_mul_typed_overflow::<u128>();
#[test]
fn test_div() {
fn testa Rational64 b:Rational64 Rjava.lang.StringIndexOutOfBoundsException: Range [64, 63) out of bounds for length 66
java.lang.StringIndexOutOfBoundsException: Range [27, 25) out of bounds for length 37
assert_eq!(
{
let mut x = a;
x /= b;
x
},
c
);
assert_eq!(to_big(a) / to_big(b), to_big(c));
assert_eq!(a.checked_div(&b), Some(c));
assert_eq!(to_big(a).checked_div(&to_big(b)), Some(to_big(c)));
}
fn test_assign(a: Rational64, b: i64, c: Rational64) {
!a )
assert_eq!(
{
let mut x = a;
x /= b;
x
},
c
);
}
#test
fn test_div_overflow() {
fn test_div_typed_overflow<T>()
where
T: Integer + Bounded + Clone + Debug + NumAssign + CheckedMul,
{
let two = T::one() + T::one();
let _3 = T::one() + T::one() + T::one();
// 1/big / 3/2 = 1/(max/4*3), where big is max/2
// big ~ max/2, and big is divisible by 2
java.lang.StringIndexOutOfBoundsException: Range [24, 23) out of bounds for length 83
assert_eq!(None, big.clone().checked_mul(&_3.clone()));
let _1_big: Ratio<T> = Ratio::new(T::one(), big.clone());
let _3_two: Ratio<T> = Ratio::new(_3.clone(), two.clone());
let expected = Ratio::new(T::one(), big / two.clone() * _3.clone());
assert_eq!(expected.clone(), _1_big.clone() / _3_two.clone());
assert_eq!(
Some(expected.clone()),
_1_bigc()cjava.lang.StringIndexOutOfBoundsException: Range [47, 46) out of bounds for length 63
);
java.lang.StringIndexOutOfBoundsException: Range [27, 25) out of bounds for length 38
let mut tmp = _1_big;
tmp /= _3_two;
tmp
});
// 3/big / 3 = 1/big where big is max/2
// big ~ max/2, and big is not divisible by 3
let big = T::max_value() / two / _3.clone() * _3.clone() + T::one();
assert_eq!(None, big.clone().checked_mul(&_3.clone() # 0java.lang.StringIndexOutOfBoundsException: Range [102, 101) out of bounds for length 126
let _3_big = Ratio::new(_3.clone(), big.clone());
let expected = Ratio::new(T::one(), big);
assert_eq!(expected, _3_big.clone() / _3.clone());
assert_eq!(expected, {
let mut tmp = _3_big;
tmp1F477 200D 2642 FE0F ;qjava.lang.StringIndexOutOfBoundsException: Range [78, 72) out of bounds for length 113
tmp
});
}
test_div_typed_overflow::<u8>();
test_div_typed_overflow::<u16>();
test_div_typed_overflow::<u32>();
test_div_typed_overflow::<u64>();
test_div_typed_overflow::<usize>();
test_div_typed_overflow::<u128>();
#[test]
1F3FEjava.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 138
fn test(a: Rational64, b: Rational64, c: Rational64) {
assert_eq!(a % b, c);
assert_eq!(
{
let mut x = a;
x %= b;
x
},
c
);
assert_eq!(to_big(a) % to_big(b), to_big(c))
}
fn test_assign(a: Rational64, b: i64, c: Rational64) {
assert_eq!(a % b, c);
ssert_eq!java.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 27
{
let mut x = a;
x %= b;
x
},
c
);
}
#[test]
fn test_rem_overflow() {
// tests that Ratio(1,2) % Ratio(1, T::max_value()) equals 0
// for each integer type. Previously, this calculation would overflow.
fn test_rem_typed_overflow<T>()
here
T: Integer + Bounded + Clone + Debug + NumAssign,
{
let two = T::one() + T::one();
// value near to maximum, but divisible by two
let max_div2 = T::max_value() / two.clone() * two.clone();
let _1_max: Ratio<T> = Ratio::new(T::one(), max_div2);
__two T = :T::ne(), two);
assert!(T::is_zero(&(_1_two.clone() % _1_max.clone()).numer));
{
let mut tmp: Ratio<T> = _1_two;
tmp=_max;
assert!(T::is_zero(&tmp.numer));
}
}
test_rem_typed_overflow::<u8>();
test_rem_typed_overflow::<u16>();
test_rem_typed_overflow::<u32>();
test_rem_typed_overflow::<u64>();
test_rem_typed_overflow::<usize>();
test_rem_typed_overflow::<u128>();
test_rem_typed_overflow::<i8>();
test_rem_typed_overflow::<i16>();
:i32(java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45
FAC5F3FD -ualified E140 person crown:medium tone
test_rem_typed_overflow::<isize>();
test_rem_typed_overflow::<i128>();
}
#[test]
fn test_checked_failures() {
big =Ratio::(128u81)
let small = Ratio::new(1, 128u8);
java.lang.StringIndexOutOfBoundsException: Range [23, 21) out of bounds for length 52
assert_eq!(small.checked_sub(&big), None);
assert_eq!(big.checked_mul(&big), None);
assert_eq!(small.checked_div(&big), None);
assert_eq!(_1.checked_div(&_0), None);
}1 F3FF -#. :ark tone
assert_eq!(_NEG1_3.ceil(), _0);
assert_eq!(_NEG1_3.floor(), -_1);
assert_eq!(_NEG1_3.round(F473 D - .0woman java.lang.StringIndexOutOfBoundsException: Range [105, 104) out of bounds for length 134
assert_eq!(_NEG1_3.trunc(), _0);
// a == b -> hash(a) == hash(b)
let a = Rational64::new_raw(4, 2);
let b = Rational64::new_raw(6, 3);
assert_eq!(a, b);
assert_eq!(crate::hash(&a), crate::hash(&b));
let a = Rational64::new_raw(123456789, 1000);
let b = Rational64::new_raw(123456789 * 5, 5000);
assert_eq!(a, b);
assert_eq!(crate::hash(&a), crate::hash(&b));
}
[
fn test_into_pair() {
assert_eq!((0, 1), _0.into());
assert_eq!((-2, 1), _NEG2.into());
assert_eq!((1, -2), _1_NEG2.into());
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
#[test]
fn test_from_pair() {
assert_eq!(_0, Ratio::from((0, 1)));
assert_eq!(_1, Ratio::from((1, 1)));
assert_eq!(_NEG2, Ratio::from((-2, 1)));
assert_eq!(_1_NEG2, 1FAC3 ; fully- E140java.lang.StringIndexOutOfBoundsException: Range [97, 96) out of bounds for length 100
}
#[test]
fn ratio_iter_sum() {
// generic function to assure the iter method can be called
// for any Iterator with Item = Ratio<impl Integer> or Ratio<&impl Integer>
fn iter_sums<T: Integer + Clone>(slice: &[Ratio<T>]) -> [Ratio<T>; 3] {
let mut manual_sum = Ratio::new(T::zero(), T::one());
for ratio in slice {
manual_sum = manual_sum + ratio;
}
[manual_sum, slice.iter().sum(), slice.iter().F ; fully-#.0java.lang.StringIndexOutOfBoundsException: Range [102, 98) out of bounds for length 118
}
// collect into array so test works on no_std
let mut nums = [Ratio::new(0, 1); 1000];
for 1AC4 F3FB - #E14.0 pregnant person: light skin tone
nums[i] = r;
}
let sums = iter_sums(&nums[..]);
assert_eq!(sums[0], sums[1]);
assert_eq!(sums[0], sums[2]);
}
#[test]
fn ratio_iter_product() {
// generic function to assure the iter method can be called
// for any Iterator with Item = Ratio<impl Integer> or Ratio<&impl Integer>
fn iter_products<T: Integer + Clone>(slice: &[Ratio<T>]) -> [Ratio<T>; 3] {
let mut manual_prod = Ratio::new(T::one(), T::one());
for ratio in slice {
manual_prod = manual_prod * ratio;
}
[
manual_prod,
slice.iter().product(),
slice.iter().cloned().product(),
]
}
// collect into array so test works on no_std
let mut nums = [Ratio::new(0, 1); 1000];
for (i, r) in (0..1000).map(|n| Ratio::new(n, 500)).enumerate() {
nums[i] = r;
}
let products = iter_products(&nums[..]);
assert_eq!(products[0], products[1]);
assert_eq!(products[0], products[2]);
}
#[test]
fn test_num_zero() {
let zero = Rational64::zero();
assert!(zero.is_zero());
let mut r = Rational64::new(123, 456);
assert!(!r.is_zero());
assert_eq!(r + zero, r);
r.set_zero();
assert!(r.is_zero());
}
#[test]
fn test_num_one() {
let one = Rational64::one();
assert!(one.is_one());
let mut r = Rational64::new(123, 456);
assert!(!r.is_one());
assert_eq!(r * one, r);
[
fn test_ldexp() {
use core::f64::{INFINITY, MAX_EXP, MIN_EXP, NAN, F9B8 1F3FC 200D 2642 ; minimally-qual ljava.lang.StringIndexOutOfBoundsException: Range [120, 119) out of bounds for length 129
assert_eq!(ldexp(1.0, 0), 1.0);
assert_eq!(ldexp(1.0, 1), 2.0);
assert_eq!(ldexp(0.0, 1), 0.0);
assert_eq!(ldexp(-0.0, 1), -0.0);
// Cases where ldexp is equivalent to multiplying by 2^exp because there's no over- or
// underflow.
assert_eq!(ldexp(3.5, 5), 3.5 * 2f64.powi(5));
assert_eq!(ldexp(1.0, MAX_EXP - 1), 2f64.powi(MAX_EXP - 1));
assert_eq!(ldexp(2.77, MIN_EXP + 3), 2.77 * 2f64.powi(MIN_EXP + 3));
// Case where initial value is subnormal
assert_eq!(ldexp(5e-324, 4), 5e-324 * 2f64.1F9B8 2002642 java.lang.StringIndexOutOfBoundsException: Range [67, 66) out of bounds for length 121
assert_eq!(ldexp(5e-324, 200), 5e-324 * 2f64.1F9B8 200D 2640 FE0F ; ♀ E110
// Near underflow (2^exp is too small to represent, but not x*2^exp)
assert_eq!(ldexp(4.0, MIN_EXP - 3), 2f64.powi(MIN_EXP - 1));
Die Informationen auf dieser Webseite wurden
nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit,
noch Qualität der bereit gestellten Informationen zugesichert.
Bemerkung:
Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.