1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! The 32-bit floating point type.
13 //! *[See also the `f32` primitive type](../primitive.f32.html).*
15 #![stable(feature = "rust1", since = "1.0.0")]
16 #![allow(missing_docs)]
28 #[stable(feature = "rust1", since = "1.0.0")]
29 pub use core::f32::{RADIX, MANTISSA_DIGITS, DIGITS, EPSILON};
30 #[stable(feature = "rust1", since = "1.0.0")]
31 pub use core::f32::{MIN_EXP, MAX_EXP, MIN_10_EXP};
32 #[stable(feature = "rust1", since = "1.0.0")]
33 pub use core::f32::{MAX_10_EXP, NAN, INFINITY, NEG_INFINITY};
34 #[stable(feature = "rust1", since = "1.0.0")]
35 pub use core::f32::{MIN, MIN_POSITIVE, MAX};
36 #[stable(feature = "rust1", since = "1.0.0")]
37 pub use core::f32::consts;
41 use libc::{c_float, c_int};
44 pub fn cbrtf(n: c_float) -> c_float;
45 pub fn erff(n: c_float) -> c_float;
46 pub fn erfcf(n: c_float) -> c_float;
47 pub fn expm1f(n: c_float) -> c_float;
48 pub fn fdimf(a: c_float, b: c_float) -> c_float;
49 pub fn fmaxf(a: c_float, b: c_float) -> c_float;
50 pub fn fminf(a: c_float, b: c_float) -> c_float;
51 pub fn fmodf(a: c_float, b: c_float) -> c_float;
52 pub fn ilogbf(n: c_float) -> c_int;
53 pub fn logbf(n: c_float) -> c_float;
54 pub fn log1pf(n: c_float) -> c_float;
55 pub fn modff(n: c_float, iptr: &mut c_float) -> c_float;
56 pub fn nextafterf(x: c_float, y: c_float) -> c_float;
57 pub fn tgammaf(n: c_float) -> c_float;
59 #[cfg_attr(all(windows, target_env = "msvc"), link_name = "__lgammaf_r")]
60 pub fn lgammaf_r(n: c_float, sign: &mut c_int) -> c_float;
61 #[cfg_attr(all(windows, target_env = "msvc"), link_name = "_hypotf")]
62 pub fn hypotf(x: c_float, y: c_float) -> c_float;
65 // See the comments in the `floor` function for why MSVC is special
67 #[cfg(not(target_env = "msvc"))]
69 pub fn acosf(n: c_float) -> c_float;
70 pub fn asinf(n: c_float) -> c_float;
71 pub fn atan2f(a: c_float, b: c_float) -> c_float;
72 pub fn atanf(n: c_float) -> c_float;
73 pub fn coshf(n: c_float) -> c_float;
74 pub fn frexpf(n: c_float, value: &mut c_int) -> c_float;
75 pub fn ldexpf(x: c_float, n: c_int) -> c_float;
76 pub fn sinhf(n: c_float) -> c_float;
77 pub fn tanf(n: c_float) -> c_float;
78 pub fn tanhf(n: c_float) -> c_float;
81 #[cfg(target_env = "msvc")]
82 pub use self::shims::*;
83 #[cfg(target_env = "msvc")]
85 use libc::{c_float, c_int};
88 pub unsafe fn acosf(n: c_float) -> c_float {
89 f64::acos(n as f64) as c_float
93 pub unsafe fn asinf(n: c_float) -> c_float {
94 f64::asin(n as f64) as c_float
98 pub unsafe fn atan2f(n: c_float, b: c_float) -> c_float {
99 f64::atan2(n as f64, b as f64) as c_float
103 pub unsafe fn atanf(n: c_float) -> c_float {
104 f64::atan(n as f64) as c_float
108 pub unsafe fn coshf(n: c_float) -> c_float {
109 f64::cosh(n as f64) as c_float
113 pub unsafe fn frexpf(x: c_float, value: &mut c_int) -> c_float {
114 let (a, b) = f64::frexp(x as f64);
120 pub unsafe fn ldexpf(x: c_float, n: c_int) -> c_float {
121 f64::ldexp(x as f64, n as isize) as c_float
125 pub unsafe fn sinhf(n: c_float) -> c_float {
126 f64::sinh(n as f64) as c_float
130 pub unsafe fn tanf(n: c_float) -> c_float {
131 f64::tan(n as f64) as c_float
135 pub unsafe fn tanhf(n: c_float) -> c_float {
136 f64::tanh(n as f64) as c_float
144 /// Returns `true` if this value is `NaN` and false otherwise.
149 /// let nan = f32::NAN;
152 /// assert!(nan.is_nan());
153 /// assert!(!f.is_nan());
155 #[stable(feature = "rust1", since = "1.0.0")]
157 pub fn is_nan(self) -> bool { num::Float::is_nan(self) }
159 /// Returns `true` if this value is positive infinity or negative infinity and
166 /// let inf = f32::INFINITY;
167 /// let neg_inf = f32::NEG_INFINITY;
168 /// let nan = f32::NAN;
170 /// assert!(!f.is_infinite());
171 /// assert!(!nan.is_infinite());
173 /// assert!(inf.is_infinite());
174 /// assert!(neg_inf.is_infinite());
176 #[stable(feature = "rust1", since = "1.0.0")]
178 pub fn is_infinite(self) -> bool { num::Float::is_infinite(self) }
180 /// Returns `true` if this number is neither infinite nor `NaN`.
186 /// let inf = f32::INFINITY;
187 /// let neg_inf = f32::NEG_INFINITY;
188 /// let nan = f32::NAN;
190 /// assert!(f.is_finite());
192 /// assert!(!nan.is_finite());
193 /// assert!(!inf.is_finite());
194 /// assert!(!neg_inf.is_finite());
196 #[stable(feature = "rust1", since = "1.0.0")]
198 pub fn is_finite(self) -> bool { num::Float::is_finite(self) }
200 /// Returns `true` if the number is neither zero, infinite,
201 /// [subnormal][subnormal], or `NaN`.
206 /// let min = f32::MIN_POSITIVE; // 1.17549435e-38f32
207 /// let max = f32::MAX;
208 /// let lower_than_min = 1.0e-40_f32;
209 /// let zero = 0.0_f32;
211 /// assert!(min.is_normal());
212 /// assert!(max.is_normal());
214 /// assert!(!zero.is_normal());
215 /// assert!(!f32::NAN.is_normal());
216 /// assert!(!f32::INFINITY.is_normal());
217 /// // Values between `0` and `min` are Subnormal.
218 /// assert!(!lower_than_min.is_normal());
220 /// [subnormal]: http://en.wikipedia.org/wiki/Denormal_number
221 #[stable(feature = "rust1", since = "1.0.0")]
223 pub fn is_normal(self) -> bool { num::Float::is_normal(self) }
225 /// Returns the floating point category of the number. If only one property
226 /// is going to be tested, it is generally faster to use the specific
227 /// predicate instead.
230 /// use std::num::FpCategory;
233 /// let num = 12.4_f32;
234 /// let inf = f32::INFINITY;
236 /// assert_eq!(num.classify(), FpCategory::Normal);
237 /// assert_eq!(inf.classify(), FpCategory::Infinite);
239 #[stable(feature = "rust1", since = "1.0.0")]
241 pub fn classify(self) -> FpCategory { num::Float::classify(self) }
243 /// Returns the mantissa, base 2 exponent, and sign as integers, respectively.
244 /// The original number can be recovered by `sign * mantissa * 2 ^ exponent`.
245 /// The floating point encoding is documented in the [Reference][floating-point].
248 /// #![feature(float_extras)]
252 /// let num = 2.0f32;
254 /// // (8388608, -22, 1)
255 /// let (mantissa, exponent, sign) = num.integer_decode();
256 /// let sign_f = sign as f32;
257 /// let mantissa_f = mantissa as f32;
258 /// let exponent_f = num.powf(exponent as f32);
260 /// // 1 * 8388608 * 2^(-22) == 2
261 /// let abs_difference = (sign_f * mantissa_f * exponent_f - num).abs();
263 /// assert!(abs_difference <= f32::EPSILON);
265 /// [floating-point]: ../reference.html#machine-types
266 #[unstable(feature = "float_extras", reason = "signature is undecided",
269 pub fn integer_decode(self) -> (u64, i16, i8) {
270 num::Float::integer_decode(self)
273 /// Returns the largest integer less than or equal to a number.
276 /// let f = 3.99_f32;
279 /// assert_eq!(f.floor(), 3.0);
280 /// assert_eq!(g.floor(), 3.0);
282 #[stable(feature = "rust1", since = "1.0.0")]
284 pub fn floor(self) -> f32 {
285 // On MSVC LLVM will lower many math intrinsics to a call to the
286 // corresponding function. On MSVC, however, many of these functions
287 // aren't actually available as symbols to call, but rather they are all
288 // `static inline` functions in header files. This means that from a C
289 // perspective it's "compatible", but not so much from an ABI
290 // perspective (which we're worried about).
292 // The inline header functions always just cast to a f64 and do their
293 // operation, so we do that here as well, but only for MSVC targets.
295 // Note that there are many MSVC-specific float operations which
296 // redirect to this comment, so `floorf` is just one case of a missing
297 // function on MSVC, but there are many others elsewhere.
298 #[cfg(target_env = "msvc")]
299 return (self as f64).floor() as f32;
300 #[cfg(not(target_env = "msvc"))]
301 return unsafe { intrinsics::floorf32(self) };
304 /// Returns the smallest integer greater than or equal to a number.
307 /// let f = 3.01_f32;
310 /// assert_eq!(f.ceil(), 4.0);
311 /// assert_eq!(g.ceil(), 4.0);
313 #[stable(feature = "rust1", since = "1.0.0")]
315 pub fn ceil(self) -> f32 {
316 // see notes above in `floor`
317 #[cfg(target_env = "msvc")]
318 return (self as f64).ceil() as f32;
319 #[cfg(not(target_env = "msvc"))]
320 return unsafe { intrinsics::ceilf32(self) };
323 /// Returns the nearest integer to a number. Round half-way cases away from
328 /// let g = -3.3_f32;
330 /// assert_eq!(f.round(), 3.0);
331 /// assert_eq!(g.round(), -3.0);
333 #[stable(feature = "rust1", since = "1.0.0")]
335 pub fn round(self) -> f32 {
336 unsafe { intrinsics::roundf32(self) }
339 /// Returns the integer part of a number.
343 /// let g = -3.7_f32;
345 /// assert_eq!(f.trunc(), 3.0);
346 /// assert_eq!(g.trunc(), -3.0);
348 #[stable(feature = "rust1", since = "1.0.0")]
350 pub fn trunc(self) -> f32 {
351 unsafe { intrinsics::truncf32(self) }
354 /// Returns the fractional part of a number.
360 /// let y = -3.5_f32;
361 /// let abs_difference_x = (x.fract() - 0.5).abs();
362 /// let abs_difference_y = (y.fract() - (-0.5)).abs();
364 /// assert!(abs_difference_x <= f32::EPSILON);
365 /// assert!(abs_difference_y <= f32::EPSILON);
367 #[stable(feature = "rust1", since = "1.0.0")]
369 pub fn fract(self) -> f32 { self - self.trunc() }
371 /// Computes the absolute value of `self`. Returns `NAN` if the
378 /// let y = -3.5_f32;
380 /// let abs_difference_x = (x.abs() - x).abs();
381 /// let abs_difference_y = (y.abs() - (-y)).abs();
383 /// assert!(abs_difference_x <= f32::EPSILON);
384 /// assert!(abs_difference_y <= f32::EPSILON);
386 /// assert!(f32::NAN.abs().is_nan());
388 #[stable(feature = "rust1", since = "1.0.0")]
390 pub fn abs(self) -> f32 { num::Float::abs(self) }
392 /// Returns a number that represents the sign of `self`.
394 /// - `1.0` if the number is positive, `+0.0` or `INFINITY`
395 /// - `-1.0` if the number is negative, `-0.0` or `NEG_INFINITY`
396 /// - `NAN` if the number is `NAN`
403 /// assert_eq!(f.signum(), 1.0);
404 /// assert_eq!(f32::NEG_INFINITY.signum(), -1.0);
406 /// assert!(f32::NAN.signum().is_nan());
408 #[stable(feature = "rust1", since = "1.0.0")]
410 pub fn signum(self) -> f32 { num::Float::signum(self) }
412 /// Returns `true` if `self`'s sign bit is positive, including
413 /// `+0.0` and `INFINITY`.
418 /// let nan = f32::NAN;
420 /// let g = -7.0_f32;
422 /// assert!(f.is_sign_positive());
423 /// assert!(!g.is_sign_positive());
424 /// // Requires both tests to determine if is `NaN`
425 /// assert!(!nan.is_sign_positive() && !nan.is_sign_negative());
427 #[stable(feature = "rust1", since = "1.0.0")]
429 pub fn is_sign_positive(self) -> bool { num::Float::is_sign_positive(self) }
431 /// Returns `true` if `self`'s sign is negative, including `-0.0`
432 /// and `NEG_INFINITY`.
437 /// let nan = f32::NAN;
441 /// assert!(!f.is_sign_negative());
442 /// assert!(g.is_sign_negative());
443 /// // Requires both tests to determine if is `NaN`.
444 /// assert!(!nan.is_sign_positive() && !nan.is_sign_negative());
446 #[stable(feature = "rust1", since = "1.0.0")]
448 pub fn is_sign_negative(self) -> bool { num::Float::is_sign_negative(self) }
450 /// Fused multiply-add. Computes `(self * a) + b` with only one rounding
451 /// error. This produces a more accurate result with better performance than
452 /// a separate multiplication operation followed by an add.
457 /// let m = 10.0_f32;
459 /// let b = 60.0_f32;
462 /// let abs_difference = (m.mul_add(x, b) - (m*x + b)).abs();
464 /// assert!(abs_difference <= f32::EPSILON);
466 #[stable(feature = "rust1", since = "1.0.0")]
468 pub fn mul_add(self, a: f32, b: f32) -> f32 {
469 unsafe { intrinsics::fmaf32(self, a, b) }
472 /// Takes the reciprocal (inverse) of a number, `1/x`.
478 /// let abs_difference = (x.recip() - (1.0/x)).abs();
480 /// assert!(abs_difference <= f32::EPSILON);
482 #[stable(feature = "rust1", since = "1.0.0")]
484 pub fn recip(self) -> f32 { num::Float::recip(self) }
486 /// Raises a number to an integer power.
488 /// Using this function is generally faster than using `powf`
494 /// let abs_difference = (x.powi(2) - x*x).abs();
496 /// assert!(abs_difference <= f32::EPSILON);
498 #[stable(feature = "rust1", since = "1.0.0")]
500 pub fn powi(self, n: i32) -> f32 { num::Float::powi(self, n) }
502 /// Raises a number to a floating point power.
508 /// let abs_difference = (x.powf(2.0) - x*x).abs();
510 /// assert!(abs_difference <= f32::EPSILON);
512 #[stable(feature = "rust1", since = "1.0.0")]
514 pub fn powf(self, n: f32) -> f32 {
515 // see notes above in `floor`
516 #[cfg(target_env = "msvc")]
517 return (self as f64).powf(n as f64) as f32;
518 #[cfg(not(target_env = "msvc"))]
519 return unsafe { intrinsics::powf32(self, n) };
522 /// Takes the square root of a number.
524 /// Returns NaN if `self` is a negative number.
529 /// let positive = 4.0_f32;
530 /// let negative = -4.0_f32;
532 /// let abs_difference = (positive.sqrt() - 2.0).abs();
534 /// assert!(abs_difference <= f32::EPSILON);
535 /// assert!(negative.sqrt().is_nan());
537 #[stable(feature = "rust1", since = "1.0.0")]
539 pub fn sqrt(self) -> f32 {
543 unsafe { intrinsics::sqrtf32(self) }
547 /// Returns `e^(self)`, (the exponential function).
552 /// let one = 1.0f32;
554 /// let e = one.exp();
556 /// // ln(e) - 1 == 0
557 /// let abs_difference = (e.ln() - 1.0).abs();
559 /// assert!(abs_difference <= f32::EPSILON);
561 #[stable(feature = "rust1", since = "1.0.0")]
563 pub fn exp(self) -> f32 {
564 // see notes above in `floor`
565 #[cfg(target_env = "msvc")]
566 return (self as f64).exp() as f32;
567 #[cfg(not(target_env = "msvc"))]
568 return unsafe { intrinsics::expf32(self) };
571 /// Returns `2^(self)`.
579 /// let abs_difference = (f.exp2() - 4.0).abs();
581 /// assert!(abs_difference <= f32::EPSILON);
583 #[stable(feature = "rust1", since = "1.0.0")]
585 pub fn exp2(self) -> f32 {
586 unsafe { intrinsics::exp2f32(self) }
589 /// Returns the natural logarithm of the number.
594 /// let one = 1.0f32;
596 /// let e = one.exp();
598 /// // ln(e) - 1 == 0
599 /// let abs_difference = (e.ln() - 1.0).abs();
601 /// assert!(abs_difference <= f32::EPSILON);
603 #[stable(feature = "rust1", since = "1.0.0")]
605 pub fn ln(self) -> f32 {
606 // see notes above in `floor`
607 #[cfg(target_env = "msvc")]
608 return (self as f64).ln() as f32;
609 #[cfg(not(target_env = "msvc"))]
610 return unsafe { intrinsics::logf32(self) };
613 /// Returns the logarithm of the number with respect to an arbitrary base.
618 /// let ten = 10.0f32;
619 /// let two = 2.0f32;
621 /// // log10(10) - 1 == 0
622 /// let abs_difference_10 = (ten.log(10.0) - 1.0).abs();
624 /// // log2(2) - 1 == 0
625 /// let abs_difference_2 = (two.log(2.0) - 1.0).abs();
627 /// assert!(abs_difference_10 <= f32::EPSILON);
628 /// assert!(abs_difference_2 <= f32::EPSILON);
630 #[stable(feature = "rust1", since = "1.0.0")]
632 pub fn log(self, base: f32) -> f32 { self.ln() / base.ln() }
634 /// Returns the base 2 logarithm of the number.
639 /// let two = 2.0f32;
641 /// // log2(2) - 1 == 0
642 /// let abs_difference = (two.log2() - 1.0).abs();
644 /// assert!(abs_difference <= f32::EPSILON);
646 #[stable(feature = "rust1", since = "1.0.0")]
648 pub fn log2(self) -> f32 {
649 #[cfg(target_os = "android")]
650 return ::sys::android::log2f32(self);
651 #[cfg(not(target_os = "android"))]
652 return unsafe { intrinsics::log2f32(self) };
655 /// Returns the base 10 logarithm of the number.
660 /// let ten = 10.0f32;
662 /// // log10(10) - 1 == 0
663 /// let abs_difference = (ten.log10() - 1.0).abs();
665 /// assert!(abs_difference <= f32::EPSILON);
667 #[stable(feature = "rust1", since = "1.0.0")]
669 pub fn log10(self) -> f32 {
670 // see notes above in `floor`
671 #[cfg(target_env = "msvc")]
672 return (self as f64).log10() as f32;
673 #[cfg(not(target_env = "msvc"))]
674 return unsafe { intrinsics::log10f32(self) };
677 /// Converts radians to degrees.
680 /// use std::f32::{self, consts};
682 /// let angle = consts::PI;
684 /// let abs_difference = (angle.to_degrees() - 180.0).abs();
686 /// assert!(abs_difference <= f32::EPSILON);
688 #[stable(feature = "f32_deg_rad_conversions", since="1.7.0")]
690 pub fn to_degrees(self) -> f32 { num::Float::to_degrees(self) }
692 /// Converts degrees to radians.
695 /// use std::f32::{self, consts};
697 /// let angle = 180.0f32;
699 /// let abs_difference = (angle.to_radians() - consts::PI).abs();
701 /// assert!(abs_difference <= f32::EPSILON);
703 #[stable(feature = "f32_deg_rad_conversions", since="1.7.0")]
705 pub fn to_radians(self) -> f32 { num::Float::to_radians(self) }
707 /// Constructs a floating point number of `x*2^exp`.
710 /// #![feature(float_extras)]
713 /// // 3*2^2 - 12 == 0
714 /// let abs_difference = (f32::ldexp(3.0, 2) - 12.0).abs();
716 /// assert!(abs_difference <= f32::EPSILON);
718 #[unstable(feature = "float_extras",
719 reason = "pending integer conventions",
722 pub fn ldexp(x: f32, exp: isize) -> f32 {
723 unsafe { cmath::ldexpf(x, exp as c_int) }
726 /// Breaks the number into a normalized fraction and a base-2 exponent,
729 /// * `self = x * 2^exp`
730 /// * `0.5 <= abs(x) < 1.0`
733 /// #![feature(float_extras)]
739 /// // (1/2)*2^3 -> 1 * 8/2 -> 4.0
740 /// let f = x.frexp();
741 /// let abs_difference_0 = (f.0 - 0.5).abs();
742 /// let abs_difference_1 = (f.1 as f32 - 3.0).abs();
744 /// assert!(abs_difference_0 <= f32::EPSILON);
745 /// assert!(abs_difference_1 <= f32::EPSILON);
747 #[unstable(feature = "float_extras",
748 reason = "pending integer conventions",
751 pub fn frexp(self) -> (f32, isize) {
754 let x = cmath::frexpf(self, &mut exp);
759 /// Returns the next representable floating-point value in the direction of
763 /// #![feature(float_extras)]
769 /// let abs_diff = (x.next_after(2.0) - 1.00000011920928955078125_f32).abs();
771 /// assert!(abs_diff <= f32::EPSILON);
773 #[unstable(feature = "float_extras",
774 reason = "unsure about its place in the world",
777 pub fn next_after(self, other: f32) -> f32 {
778 unsafe { cmath::nextafterf(self, other) }
781 /// Returns the maximum of the two numbers.
787 /// assert_eq!(x.max(y), y);
790 /// If one of the arguments is NaN, then the other argument is returned.
791 #[stable(feature = "rust1", since = "1.0.0")]
793 pub fn max(self, other: f32) -> f32 {
794 unsafe { cmath::fmaxf(self, other) }
797 /// Returns the minimum of the two numbers.
803 /// assert_eq!(x.min(y), x);
806 /// If one of the arguments is NaN, then the other argument is returned.
807 #[stable(feature = "rust1", since = "1.0.0")]
809 pub fn min(self, other: f32) -> f32 {
810 unsafe { cmath::fminf(self, other) }
813 /// The positive difference of two numbers.
815 /// * If `self <= other`: `0:0`
816 /// * Else: `self - other`
824 /// let abs_difference_x = (x.abs_sub(1.0) - 2.0).abs();
825 /// let abs_difference_y = (y.abs_sub(1.0) - 0.0).abs();
827 /// assert!(abs_difference_x <= f32::EPSILON);
828 /// assert!(abs_difference_y <= f32::EPSILON);
830 #[stable(feature = "rust1", since = "1.0.0")]
832 #[rustc_deprecated(since = "1.10.0",
833 reason = "you probably meant `(self - other).abs()`: \
834 this operation is `(self - other).max(0.0)` (also \
835 known as `fdimf` in C). If you truly need the positive \
836 difference, consider using that expression or the C function \
837 `fdimf`, depending on how you wish to handle NaN (please consider \
838 filing an issue describing your use-case too).")]
839 pub fn abs_sub(self, other: f32) -> f32 {
840 unsafe { cmath::fdimf(self, other) }
843 /// Takes the cubic root of a number.
850 /// // x^(1/3) - 2 == 0
851 /// let abs_difference = (x.cbrt() - 2.0).abs();
853 /// assert!(abs_difference <= f32::EPSILON);
855 #[stable(feature = "rust1", since = "1.0.0")]
857 pub fn cbrt(self) -> f32 {
858 unsafe { cmath::cbrtf(self) }
861 /// Calculates the length of the hypotenuse of a right-angle triangle given
862 /// legs of length `x` and `y`.
870 /// // sqrt(x^2 + y^2)
871 /// let abs_difference = (x.hypot(y) - (x.powi(2) + y.powi(2)).sqrt()).abs();
873 /// assert!(abs_difference <= f32::EPSILON);
875 #[stable(feature = "rust1", since = "1.0.0")]
877 pub fn hypot(self, other: f32) -> f32 {
878 unsafe { cmath::hypotf(self, other) }
881 /// Computes the sine of a number (in radians).
886 /// let x = f32::consts::PI/2.0;
888 /// let abs_difference = (x.sin() - 1.0).abs();
890 /// assert!(abs_difference <= f32::EPSILON);
892 #[stable(feature = "rust1", since = "1.0.0")]
894 pub fn sin(self) -> f32 {
895 // see notes in `core::f32::Float::floor`
896 #[cfg(target_env = "msvc")]
897 return (self as f64).sin() as f32;
898 #[cfg(not(target_env = "msvc"))]
899 return unsafe { intrinsics::sinf32(self) };
902 /// Computes the cosine of a number (in radians).
907 /// let x = 2.0*f32::consts::PI;
909 /// let abs_difference = (x.cos() - 1.0).abs();
911 /// assert!(abs_difference <= f32::EPSILON);
913 #[stable(feature = "rust1", since = "1.0.0")]
915 pub fn cos(self) -> f32 {
916 // see notes in `core::f32::Float::floor`
917 #[cfg(target_env = "msvc")]
918 return (self as f64).cos() as f32;
919 #[cfg(not(target_env = "msvc"))]
920 return unsafe { intrinsics::cosf32(self) };
923 /// Computes the tangent of a number (in radians).
928 /// let x = f64::consts::PI/4.0;
929 /// let abs_difference = (x.tan() - 1.0).abs();
931 /// assert!(abs_difference < 1e-10);
933 #[stable(feature = "rust1", since = "1.0.0")]
935 pub fn tan(self) -> f32 {
936 unsafe { cmath::tanf(self) }
939 /// Computes the arcsine of a number. Return value is in radians in
940 /// the range [-pi/2, pi/2] or NaN if the number is outside the range
946 /// let f = f32::consts::PI / 2.0;
948 /// // asin(sin(pi/2))
949 /// let abs_difference = (f.sin().asin() - f32::consts::PI / 2.0).abs();
951 /// assert!(abs_difference <= f32::EPSILON);
953 #[stable(feature = "rust1", since = "1.0.0")]
955 pub fn asin(self) -> f32 {
956 unsafe { cmath::asinf(self) }
959 /// Computes the arccosine of a number. Return value is in radians in
960 /// the range [0, pi] or NaN if the number is outside the range
966 /// let f = f32::consts::PI / 4.0;
968 /// // acos(cos(pi/4))
969 /// let abs_difference = (f.cos().acos() - f32::consts::PI / 4.0).abs();
971 /// assert!(abs_difference <= f32::EPSILON);
973 #[stable(feature = "rust1", since = "1.0.0")]
975 pub fn acos(self) -> f32 {
976 unsafe { cmath::acosf(self) }
979 /// Computes the arctangent of a number. Return value is in radians in the
980 /// range [-pi/2, pi/2];
988 /// let abs_difference = (f.tan().atan() - 1.0).abs();
990 /// assert!(abs_difference <= f32::EPSILON);
992 #[stable(feature = "rust1", since = "1.0.0")]
994 pub fn atan(self) -> f32 {
995 unsafe { cmath::atanf(self) }
998 /// Computes the four quadrant arctangent of `self` (`y`) and `other` (`x`).
1000 /// * `x = 0`, `y = 0`: `0`
1001 /// * `x >= 0`: `arctan(y/x)` -> `[-pi/2, pi/2]`
1002 /// * `y >= 0`: `arctan(y/x) + pi` -> `(pi/2, pi]`
1003 /// * `y < 0`: `arctan(y/x) - pi` -> `(-pi, -pi/2)`
1008 /// let pi = f32::consts::PI;
1009 /// // All angles from horizontal right (+x)
1010 /// // 45 deg counter-clockwise
1011 /// let x1 = 3.0f32;
1012 /// let y1 = -3.0f32;
1014 /// // 135 deg clockwise
1015 /// let x2 = -3.0f32;
1016 /// let y2 = 3.0f32;
1018 /// let abs_difference_1 = (y1.atan2(x1) - (-pi/4.0)).abs();
1019 /// let abs_difference_2 = (y2.atan2(x2) - 3.0*pi/4.0).abs();
1021 /// assert!(abs_difference_1 <= f32::EPSILON);
1022 /// assert!(abs_difference_2 <= f32::EPSILON);
1024 #[stable(feature = "rust1", since = "1.0.0")]
1026 pub fn atan2(self, other: f32) -> f32 {
1027 unsafe { cmath::atan2f(self, other) }
1030 /// Simultaneously computes the sine and cosine of the number, `x`. Returns
1031 /// `(sin(x), cos(x))`.
1036 /// let x = f32::consts::PI/4.0;
1037 /// let f = x.sin_cos();
1039 /// let abs_difference_0 = (f.0 - x.sin()).abs();
1040 /// let abs_difference_1 = (f.1 - x.cos()).abs();
1042 /// assert!(abs_difference_0 <= f32::EPSILON);
1043 /// assert!(abs_difference_1 <= f32::EPSILON);
1045 #[stable(feature = "rust1", since = "1.0.0")]
1047 pub fn sin_cos(self) -> (f32, f32) {
1048 (self.sin(), self.cos())
1051 /// Returns `e^(self) - 1` in a way that is accurate even if the
1052 /// number is close to zero.
1057 /// // e^(ln(7)) - 1
1058 /// let abs_difference = (x.ln().exp_m1() - 6.0).abs();
1060 /// assert!(abs_difference < 1e-10);
1062 #[stable(feature = "rust1", since = "1.0.0")]
1064 pub fn exp_m1(self) -> f32 {
1065 unsafe { cmath::expm1f(self) }
1068 /// Returns `ln(1+n)` (natural logarithm) more accurately than if
1069 /// the operations were performed separately.
1074 /// let x = f32::consts::E - 1.0;
1076 /// // ln(1 + (e - 1)) == ln(e) == 1
1077 /// let abs_difference = (x.ln_1p() - 1.0).abs();
1079 /// assert!(abs_difference <= f32::EPSILON);
1081 #[stable(feature = "rust1", since = "1.0.0")]
1083 pub fn ln_1p(self) -> f32 {
1084 unsafe { cmath::log1pf(self) }
1087 /// Hyperbolic sine function.
1092 /// let e = f32::consts::E;
1095 /// let f = x.sinh();
1096 /// // Solving sinh() at 1 gives `(e^2-1)/(2e)`
1097 /// let g = (e*e - 1.0)/(2.0*e);
1098 /// let abs_difference = (f - g).abs();
1100 /// assert!(abs_difference <= f32::EPSILON);
1102 #[stable(feature = "rust1", since = "1.0.0")]
1104 pub fn sinh(self) -> f32 {
1105 unsafe { cmath::sinhf(self) }
1108 /// Hyperbolic cosine function.
1113 /// let e = f32::consts::E;
1115 /// let f = x.cosh();
1116 /// // Solving cosh() at 1 gives this result
1117 /// let g = (e*e + 1.0)/(2.0*e);
1118 /// let abs_difference = (f - g).abs();
1121 /// assert!(abs_difference <= f32::EPSILON);
1123 #[stable(feature = "rust1", since = "1.0.0")]
1125 pub fn cosh(self) -> f32 {
1126 unsafe { cmath::coshf(self) }
1129 /// Hyperbolic tangent function.
1134 /// let e = f32::consts::E;
1137 /// let f = x.tanh();
1138 /// // Solving tanh() at 1 gives `(1 - e^(-2))/(1 + e^(-2))`
1139 /// let g = (1.0 - e.powi(-2))/(1.0 + e.powi(-2));
1140 /// let abs_difference = (f - g).abs();
1142 /// assert!(abs_difference <= f32::EPSILON);
1144 #[stable(feature = "rust1", since = "1.0.0")]
1146 pub fn tanh(self) -> f32 {
1147 unsafe { cmath::tanhf(self) }
1150 /// Inverse hyperbolic sine function.
1156 /// let f = x.sinh().asinh();
1158 /// let abs_difference = (f - x).abs();
1160 /// assert!(abs_difference <= f32::EPSILON);
1162 #[stable(feature = "rust1", since = "1.0.0")]
1164 pub fn asinh(self) -> f32 {
1165 if self == NEG_INFINITY {
1168 (self + ((self * self) + 1.0).sqrt()).ln()
1172 /// Inverse hyperbolic cosine function.
1178 /// let f = x.cosh().acosh();
1180 /// let abs_difference = (f - x).abs();
1182 /// assert!(abs_difference <= f32::EPSILON);
1184 #[stable(feature = "rust1", since = "1.0.0")]
1186 pub fn acosh(self) -> f32 {
1188 x if x < 1.0 => ::f32::NAN,
1189 x => (x + ((x * x) - 1.0).sqrt()).ln(),
1193 /// Inverse hyperbolic tangent function.
1198 /// let e = f32::consts::E;
1199 /// let f = e.tanh().atanh();
1201 /// let abs_difference = (f - e).abs();
1203 /// assert!(abs_difference <= 1e-5);
1205 #[stable(feature = "rust1", since = "1.0.0")]
1207 pub fn atanh(self) -> f32 {
1208 0.5 * ((2.0 * self) / (1.0 - self)).ln_1p()
1217 use num::FpCategory as Fp;
1221 test_num(10f32, 2f32);
1226 assert_eq!(NAN.min(2.0), 2.0);
1227 assert_eq!(2.0f32.min(NAN), 2.0);
1232 assert_eq!(NAN.max(2.0), 2.0);
1233 assert_eq!(2.0f32.max(NAN), 2.0);
1238 let nan: f32 = f32::NAN;
1239 assert!(nan.is_nan());
1240 assert!(!nan.is_infinite());
1241 assert!(!nan.is_finite());
1242 assert!(!nan.is_normal());
1243 assert!(!nan.is_sign_positive());
1244 assert!(!nan.is_sign_negative());
1245 assert_eq!(Fp::Nan, nan.classify());
1249 fn test_infinity() {
1250 let inf: f32 = f32::INFINITY;
1251 assert!(inf.is_infinite());
1252 assert!(!inf.is_finite());
1253 assert!(inf.is_sign_positive());
1254 assert!(!inf.is_sign_negative());
1255 assert!(!inf.is_nan());
1256 assert!(!inf.is_normal());
1257 assert_eq!(Fp::Infinite, inf.classify());
1261 fn test_neg_infinity() {
1262 let neg_inf: f32 = f32::NEG_INFINITY;
1263 assert!(neg_inf.is_infinite());
1264 assert!(!neg_inf.is_finite());
1265 assert!(!neg_inf.is_sign_positive());
1266 assert!(neg_inf.is_sign_negative());
1267 assert!(!neg_inf.is_nan());
1268 assert!(!neg_inf.is_normal());
1269 assert_eq!(Fp::Infinite, neg_inf.classify());
1274 let zero: f32 = 0.0f32;
1275 assert_eq!(0.0, zero);
1276 assert!(!zero.is_infinite());
1277 assert!(zero.is_finite());
1278 assert!(zero.is_sign_positive());
1279 assert!(!zero.is_sign_negative());
1280 assert!(!zero.is_nan());
1281 assert!(!zero.is_normal());
1282 assert_eq!(Fp::Zero, zero.classify());
1286 fn test_neg_zero() {
1287 let neg_zero: f32 = -0.0;
1288 assert_eq!(0.0, neg_zero);
1289 assert!(!neg_zero.is_infinite());
1290 assert!(neg_zero.is_finite());
1291 assert!(!neg_zero.is_sign_positive());
1292 assert!(neg_zero.is_sign_negative());
1293 assert!(!neg_zero.is_nan());
1294 assert!(!neg_zero.is_normal());
1295 assert_eq!(Fp::Zero, neg_zero.classify());
1300 let one: f32 = 1.0f32;
1301 assert_eq!(1.0, one);
1302 assert!(!one.is_infinite());
1303 assert!(one.is_finite());
1304 assert!(one.is_sign_positive());
1305 assert!(!one.is_sign_negative());
1306 assert!(!one.is_nan());
1307 assert!(one.is_normal());
1308 assert_eq!(Fp::Normal, one.classify());
1313 let nan: f32 = f32::NAN;
1314 let inf: f32 = f32::INFINITY;
1315 let neg_inf: f32 = f32::NEG_INFINITY;
1316 assert!(nan.is_nan());
1317 assert!(!0.0f32.is_nan());
1318 assert!(!5.3f32.is_nan());
1319 assert!(!(-10.732f32).is_nan());
1320 assert!(!inf.is_nan());
1321 assert!(!neg_inf.is_nan());
1325 fn test_is_infinite() {
1326 let nan: f32 = f32::NAN;
1327 let inf: f32 = f32::INFINITY;
1328 let neg_inf: f32 = f32::NEG_INFINITY;
1329 assert!(!nan.is_infinite());
1330 assert!(inf.is_infinite());
1331 assert!(neg_inf.is_infinite());
1332 assert!(!0.0f32.is_infinite());
1333 assert!(!42.8f32.is_infinite());
1334 assert!(!(-109.2f32).is_infinite());
1338 fn test_is_finite() {
1339 let nan: f32 = f32::NAN;
1340 let inf: f32 = f32::INFINITY;
1341 let neg_inf: f32 = f32::NEG_INFINITY;
1342 assert!(!nan.is_finite());
1343 assert!(!inf.is_finite());
1344 assert!(!neg_inf.is_finite());
1345 assert!(0.0f32.is_finite());
1346 assert!(42.8f32.is_finite());
1347 assert!((-109.2f32).is_finite());
1351 fn test_is_normal() {
1352 let nan: f32 = f32::NAN;
1353 let inf: f32 = f32::INFINITY;
1354 let neg_inf: f32 = f32::NEG_INFINITY;
1355 let zero: f32 = 0.0f32;
1356 let neg_zero: f32 = -0.0;
1357 assert!(!nan.is_normal());
1358 assert!(!inf.is_normal());
1359 assert!(!neg_inf.is_normal());
1360 assert!(!zero.is_normal());
1361 assert!(!neg_zero.is_normal());
1362 assert!(1f32.is_normal());
1363 assert!(1e-37f32.is_normal());
1364 assert!(!1e-38f32.is_normal());
1368 fn test_classify() {
1369 let nan: f32 = f32::NAN;
1370 let inf: f32 = f32::INFINITY;
1371 let neg_inf: f32 = f32::NEG_INFINITY;
1372 let zero: f32 = 0.0f32;
1373 let neg_zero: f32 = -0.0;
1374 assert_eq!(nan.classify(), Fp::Nan);
1375 assert_eq!(inf.classify(), Fp::Infinite);
1376 assert_eq!(neg_inf.classify(), Fp::Infinite);
1377 assert_eq!(zero.classify(), Fp::Zero);
1378 assert_eq!(neg_zero.classify(), Fp::Zero);
1379 assert_eq!(1f32.classify(), Fp::Normal);
1380 assert_eq!(1e-37f32.classify(), Fp::Normal);
1381 assert_eq!(1e-38f32.classify(), Fp::Subnormal);
1385 fn test_integer_decode() {
1386 assert_eq!(3.14159265359f32.integer_decode(), (13176795, -22, 1));
1387 assert_eq!((-8573.5918555f32).integer_decode(), (8779358, -10, -1));
1388 assert_eq!(2f32.powf(100.0).integer_decode(), (8388608, 77, 1));
1389 assert_eq!(0f32.integer_decode(), (0, -150, 1));
1390 assert_eq!((-0f32).integer_decode(), (0, -150, -1));
1391 assert_eq!(INFINITY.integer_decode(), (8388608, 105, 1));
1392 assert_eq!(NEG_INFINITY.integer_decode(), (8388608, 105, -1));
1394 // Ignore the "sign" (quiet / signalling flag) of NAN.
1395 // It can vary between runtime operations and LLVM folding.
1396 let (nan_m, nan_e, _nan_s) = NAN.integer_decode();
1397 assert_eq!((nan_m, nan_e), (12582912, 105));
1402 assert_approx_eq!(1.0f32.floor(), 1.0f32);
1403 assert_approx_eq!(1.3f32.floor(), 1.0f32);
1404 assert_approx_eq!(1.5f32.floor(), 1.0f32);
1405 assert_approx_eq!(1.7f32.floor(), 1.0f32);
1406 assert_approx_eq!(0.0f32.floor(), 0.0f32);
1407 assert_approx_eq!((-0.0f32).floor(), -0.0f32);
1408 assert_approx_eq!((-1.0f32).floor(), -1.0f32);
1409 assert_approx_eq!((-1.3f32).floor(), -2.0f32);
1410 assert_approx_eq!((-1.5f32).floor(), -2.0f32);
1411 assert_approx_eq!((-1.7f32).floor(), -2.0f32);
1416 assert_approx_eq!(1.0f32.ceil(), 1.0f32);
1417 assert_approx_eq!(1.3f32.ceil(), 2.0f32);
1418 assert_approx_eq!(1.5f32.ceil(), 2.0f32);
1419 assert_approx_eq!(1.7f32.ceil(), 2.0f32);
1420 assert_approx_eq!(0.0f32.ceil(), 0.0f32);
1421 assert_approx_eq!((-0.0f32).ceil(), -0.0f32);
1422 assert_approx_eq!((-1.0f32).ceil(), -1.0f32);
1423 assert_approx_eq!((-1.3f32).ceil(), -1.0f32);
1424 assert_approx_eq!((-1.5f32).ceil(), -1.0f32);
1425 assert_approx_eq!((-1.7f32).ceil(), -1.0f32);
1430 assert_approx_eq!(1.0f32.round(), 1.0f32);
1431 assert_approx_eq!(1.3f32.round(), 1.0f32);
1432 assert_approx_eq!(1.5f32.round(), 2.0f32);
1433 assert_approx_eq!(1.7f32.round(), 2.0f32);
1434 assert_approx_eq!(0.0f32.round(), 0.0f32);
1435 assert_approx_eq!((-0.0f32).round(), -0.0f32);
1436 assert_approx_eq!((-1.0f32).round(), -1.0f32);
1437 assert_approx_eq!((-1.3f32).round(), -1.0f32);
1438 assert_approx_eq!((-1.5f32).round(), -2.0f32);
1439 assert_approx_eq!((-1.7f32).round(), -2.0f32);
1444 assert_approx_eq!(1.0f32.trunc(), 1.0f32);
1445 assert_approx_eq!(1.3f32.trunc(), 1.0f32);
1446 assert_approx_eq!(1.5f32.trunc(), 1.0f32);
1447 assert_approx_eq!(1.7f32.trunc(), 1.0f32);
1448 assert_approx_eq!(0.0f32.trunc(), 0.0f32);
1449 assert_approx_eq!((-0.0f32).trunc(), -0.0f32);
1450 assert_approx_eq!((-1.0f32).trunc(), -1.0f32);
1451 assert_approx_eq!((-1.3f32).trunc(), -1.0f32);
1452 assert_approx_eq!((-1.5f32).trunc(), -1.0f32);
1453 assert_approx_eq!((-1.7f32).trunc(), -1.0f32);
1458 assert_approx_eq!(1.0f32.fract(), 0.0f32);
1459 assert_approx_eq!(1.3f32.fract(), 0.3f32);
1460 assert_approx_eq!(1.5f32.fract(), 0.5f32);
1461 assert_approx_eq!(1.7f32.fract(), 0.7f32);
1462 assert_approx_eq!(0.0f32.fract(), 0.0f32);
1463 assert_approx_eq!((-0.0f32).fract(), -0.0f32);
1464 assert_approx_eq!((-1.0f32).fract(), -0.0f32);
1465 assert_approx_eq!((-1.3f32).fract(), -0.3f32);
1466 assert_approx_eq!((-1.5f32).fract(), -0.5f32);
1467 assert_approx_eq!((-1.7f32).fract(), -0.7f32);
1472 assert_eq!(INFINITY.abs(), INFINITY);
1473 assert_eq!(1f32.abs(), 1f32);
1474 assert_eq!(0f32.abs(), 0f32);
1475 assert_eq!((-0f32).abs(), 0f32);
1476 assert_eq!((-1f32).abs(), 1f32);
1477 assert_eq!(NEG_INFINITY.abs(), INFINITY);
1478 assert_eq!((1f32/NEG_INFINITY).abs(), 0f32);
1479 assert!(NAN.abs().is_nan());
1484 assert_eq!(INFINITY.signum(), 1f32);
1485 assert_eq!(1f32.signum(), 1f32);
1486 assert_eq!(0f32.signum(), 1f32);
1487 assert_eq!((-0f32).signum(), -1f32);
1488 assert_eq!((-1f32).signum(), -1f32);
1489 assert_eq!(NEG_INFINITY.signum(), -1f32);
1490 assert_eq!((1f32/NEG_INFINITY).signum(), -1f32);
1491 assert!(NAN.signum().is_nan());
1495 fn test_is_sign_positive() {
1496 assert!(INFINITY.is_sign_positive());
1497 assert!(1f32.is_sign_positive());
1498 assert!(0f32.is_sign_positive());
1499 assert!(!(-0f32).is_sign_positive());
1500 assert!(!(-1f32).is_sign_positive());
1501 assert!(!NEG_INFINITY.is_sign_positive());
1502 assert!(!(1f32/NEG_INFINITY).is_sign_positive());
1503 assert!(!NAN.is_sign_positive());
1507 fn test_is_sign_negative() {
1508 assert!(!INFINITY.is_sign_negative());
1509 assert!(!1f32.is_sign_negative());
1510 assert!(!0f32.is_sign_negative());
1511 assert!((-0f32).is_sign_negative());
1512 assert!((-1f32).is_sign_negative());
1513 assert!(NEG_INFINITY.is_sign_negative());
1514 assert!((1f32/NEG_INFINITY).is_sign_negative());
1515 assert!(!NAN.is_sign_negative());
1520 let nan: f32 = f32::NAN;
1521 let inf: f32 = f32::INFINITY;
1522 let neg_inf: f32 = f32::NEG_INFINITY;
1523 assert_approx_eq!(12.3f32.mul_add(4.5, 6.7), 62.05);
1524 assert_approx_eq!((-12.3f32).mul_add(-4.5, -6.7), 48.65);
1525 assert_approx_eq!(0.0f32.mul_add(8.9, 1.2), 1.2);
1526 assert_approx_eq!(3.4f32.mul_add(-0.0, 5.6), 5.6);
1527 assert!(nan.mul_add(7.8, 9.0).is_nan());
1528 assert_eq!(inf.mul_add(7.8, 9.0), inf);
1529 assert_eq!(neg_inf.mul_add(7.8, 9.0), neg_inf);
1530 assert_eq!(8.9f32.mul_add(inf, 3.2), inf);
1531 assert_eq!((-3.2f32).mul_add(2.4, neg_inf), neg_inf);
1536 let nan: f32 = f32::NAN;
1537 let inf: f32 = f32::INFINITY;
1538 let neg_inf: f32 = f32::NEG_INFINITY;
1539 assert_eq!(1.0f32.recip(), 1.0);
1540 assert_eq!(2.0f32.recip(), 0.5);
1541 assert_eq!((-0.4f32).recip(), -2.5);
1542 assert_eq!(0.0f32.recip(), inf);
1543 assert!(nan.recip().is_nan());
1544 assert_eq!(inf.recip(), 0.0);
1545 assert_eq!(neg_inf.recip(), 0.0);
1550 let nan: f32 = f32::NAN;
1551 let inf: f32 = f32::INFINITY;
1552 let neg_inf: f32 = f32::NEG_INFINITY;
1553 assert_eq!(1.0f32.powi(1), 1.0);
1554 assert_approx_eq!((-3.1f32).powi(2), 9.61);
1555 assert_approx_eq!(5.9f32.powi(-2), 0.028727);
1556 assert_eq!(8.3f32.powi(0), 1.0);
1557 assert!(nan.powi(2).is_nan());
1558 assert_eq!(inf.powi(3), inf);
1559 assert_eq!(neg_inf.powi(2), inf);
1564 let nan: f32 = f32::NAN;
1565 let inf: f32 = f32::INFINITY;
1566 let neg_inf: f32 = f32::NEG_INFINITY;
1567 assert_eq!(1.0f32.powf(1.0), 1.0);
1568 assert_approx_eq!(3.4f32.powf(4.5), 246.408218);
1569 assert_approx_eq!(2.7f32.powf(-3.2), 0.041652);
1570 assert_approx_eq!((-3.1f32).powf(2.0), 9.61);
1571 assert_approx_eq!(5.9f32.powf(-2.0), 0.028727);
1572 assert_eq!(8.3f32.powf(0.0), 1.0);
1573 assert!(nan.powf(2.0).is_nan());
1574 assert_eq!(inf.powf(2.0), inf);
1575 assert_eq!(neg_inf.powf(3.0), neg_inf);
1579 fn test_sqrt_domain() {
1580 assert!(NAN.sqrt().is_nan());
1581 assert!(NEG_INFINITY.sqrt().is_nan());
1582 assert!((-1.0f32).sqrt().is_nan());
1583 assert_eq!((-0.0f32).sqrt(), -0.0);
1584 assert_eq!(0.0f32.sqrt(), 0.0);
1585 assert_eq!(1.0f32.sqrt(), 1.0);
1586 assert_eq!(INFINITY.sqrt(), INFINITY);
1591 assert_eq!(1.0, 0.0f32.exp());
1592 assert_approx_eq!(2.718282, 1.0f32.exp());
1593 assert_approx_eq!(148.413162, 5.0f32.exp());
1595 let inf: f32 = f32::INFINITY;
1596 let neg_inf: f32 = f32::NEG_INFINITY;
1597 let nan: f32 = f32::NAN;
1598 assert_eq!(inf, inf.exp());
1599 assert_eq!(0.0, neg_inf.exp());
1600 assert!(nan.exp().is_nan());
1605 assert_eq!(32.0, 5.0f32.exp2());
1606 assert_eq!(1.0, 0.0f32.exp2());
1608 let inf: f32 = f32::INFINITY;
1609 let neg_inf: f32 = f32::NEG_INFINITY;
1610 let nan: f32 = f32::NAN;
1611 assert_eq!(inf, inf.exp2());
1612 assert_eq!(0.0, neg_inf.exp2());
1613 assert!(nan.exp2().is_nan());
1618 let nan: f32 = f32::NAN;
1619 let inf: f32 = f32::INFINITY;
1620 let neg_inf: f32 = f32::NEG_INFINITY;
1621 assert_approx_eq!(1.0f32.exp().ln(), 1.0);
1622 assert!(nan.ln().is_nan());
1623 assert_eq!(inf.ln(), inf);
1624 assert!(neg_inf.ln().is_nan());
1625 assert!((-2.3f32).ln().is_nan());
1626 assert_eq!((-0.0f32).ln(), neg_inf);
1627 assert_eq!(0.0f32.ln(), neg_inf);
1628 assert_approx_eq!(4.0f32.ln(), 1.386294);
1633 let nan: f32 = f32::NAN;
1634 let inf: f32 = f32::INFINITY;
1635 let neg_inf: f32 = f32::NEG_INFINITY;
1636 assert_eq!(10.0f32.log(10.0), 1.0);
1637 assert_approx_eq!(2.3f32.log(3.5), 0.664858);
1638 assert_eq!(1.0f32.exp().log(1.0f32.exp()), 1.0);
1639 assert!(1.0f32.log(1.0).is_nan());
1640 assert!(1.0f32.log(-13.9).is_nan());
1641 assert!(nan.log(2.3).is_nan());
1642 assert_eq!(inf.log(10.0), inf);
1643 assert!(neg_inf.log(8.8).is_nan());
1644 assert!((-2.3f32).log(0.1).is_nan());
1645 assert_eq!((-0.0f32).log(2.0), neg_inf);
1646 assert_eq!(0.0f32.log(7.0), neg_inf);
1651 let nan: f32 = f32::NAN;
1652 let inf: f32 = f32::INFINITY;
1653 let neg_inf: f32 = f32::NEG_INFINITY;
1654 assert_approx_eq!(10.0f32.log2(), 3.321928);
1655 assert_approx_eq!(2.3f32.log2(), 1.201634);
1656 assert_approx_eq!(1.0f32.exp().log2(), 1.442695);
1657 assert!(nan.log2().is_nan());
1658 assert_eq!(inf.log2(), inf);
1659 assert!(neg_inf.log2().is_nan());
1660 assert!((-2.3f32).log2().is_nan());
1661 assert_eq!((-0.0f32).log2(), neg_inf);
1662 assert_eq!(0.0f32.log2(), neg_inf);
1667 let nan: f32 = f32::NAN;
1668 let inf: f32 = f32::INFINITY;
1669 let neg_inf: f32 = f32::NEG_INFINITY;
1670 assert_eq!(10.0f32.log10(), 1.0);
1671 assert_approx_eq!(2.3f32.log10(), 0.361728);
1672 assert_approx_eq!(1.0f32.exp().log10(), 0.434294);
1673 assert_eq!(1.0f32.log10(), 0.0);
1674 assert!(nan.log10().is_nan());
1675 assert_eq!(inf.log10(), inf);
1676 assert!(neg_inf.log10().is_nan());
1677 assert!((-2.3f32).log10().is_nan());
1678 assert_eq!((-0.0f32).log10(), neg_inf);
1679 assert_eq!(0.0f32.log10(), neg_inf);
1683 fn test_to_degrees() {
1684 let pi: f32 = consts::PI;
1685 let nan: f32 = f32::NAN;
1686 let inf: f32 = f32::INFINITY;
1687 let neg_inf: f32 = f32::NEG_INFINITY;
1688 assert_eq!(0.0f32.to_degrees(), 0.0);
1689 assert_approx_eq!((-5.8f32).to_degrees(), -332.315521);
1690 assert_eq!(pi.to_degrees(), 180.0);
1691 assert!(nan.to_degrees().is_nan());
1692 assert_eq!(inf.to_degrees(), inf);
1693 assert_eq!(neg_inf.to_degrees(), neg_inf);
1697 fn test_to_radians() {
1698 let pi: f32 = consts::PI;
1699 let nan: f32 = f32::NAN;
1700 let inf: f32 = f32::INFINITY;
1701 let neg_inf: f32 = f32::NEG_INFINITY;
1702 assert_eq!(0.0f32.to_radians(), 0.0);
1703 assert_approx_eq!(154.6f32.to_radians(), 2.698279);
1704 assert_approx_eq!((-332.31f32).to_radians(), -5.799903);
1705 assert_eq!(180.0f32.to_radians(), pi);
1706 assert!(nan.to_radians().is_nan());
1707 assert_eq!(inf.to_radians(), inf);
1708 assert_eq!(neg_inf.to_radians(), neg_inf);
1713 let f1 = 2.0f32.powi(-123);
1714 let f2 = 2.0f32.powi(-111);
1715 let f3 = 1.75 * 2.0f32.powi(-12);
1716 assert_eq!(f32::ldexp(1f32, -123), f1);
1717 assert_eq!(f32::ldexp(1f32, -111), f2);
1718 assert_eq!(f32::ldexp(1.75f32, -12), f3);
1720 assert_eq!(f32::ldexp(0f32, -123), 0f32);
1721 assert_eq!(f32::ldexp(-0f32, -123), -0f32);
1723 let inf: f32 = f32::INFINITY;
1724 let neg_inf: f32 = f32::NEG_INFINITY;
1725 let nan: f32 = f32::NAN;
1726 assert_eq!(f32::ldexp(inf, -123), inf);
1727 assert_eq!(f32::ldexp(neg_inf, -123), neg_inf);
1728 assert!(f32::ldexp(nan, -123).is_nan());
1733 let f1 = 2.0f32.powi(-123);
1734 let f2 = 2.0f32.powi(-111);
1735 let f3 = 1.75 * 2.0f32.powi(-123);
1736 let (x1, exp1) = f1.frexp();
1737 let (x2, exp2) = f2.frexp();
1738 let (x3, exp3) = f3.frexp();
1739 assert_eq!((x1, exp1), (0.5f32, -122));
1740 assert_eq!((x2, exp2), (0.5f32, -110));
1741 assert_eq!((x3, exp3), (0.875f32, -122));
1742 assert_eq!(f32::ldexp(x1, exp1), f1);
1743 assert_eq!(f32::ldexp(x2, exp2), f2);
1744 assert_eq!(f32::ldexp(x3, exp3), f3);
1746 assert_eq!(0f32.frexp(), (0f32, 0));
1747 assert_eq!((-0f32).frexp(), (-0f32, 0));
1750 #[test] #[cfg_attr(windows, ignore)] // FIXME #8755
1751 fn test_frexp_nowin() {
1752 let inf: f32 = f32::INFINITY;
1753 let neg_inf: f32 = f32::NEG_INFINITY;
1754 let nan: f32 = f32::NAN;
1755 assert_eq!(match inf.frexp() { (x, _) => x }, inf);
1756 assert_eq!(match neg_inf.frexp() { (x, _) => x }, neg_inf);
1757 assert!(match nan.frexp() { (x, _) => x.is_nan() })
1762 assert_eq!(0.0f32.asinh(), 0.0f32);
1763 assert_eq!((-0.0f32).asinh(), -0.0f32);
1765 let inf: f32 = f32::INFINITY;
1766 let neg_inf: f32 = f32::NEG_INFINITY;
1767 let nan: f32 = f32::NAN;
1768 assert_eq!(inf.asinh(), inf);
1769 assert_eq!(neg_inf.asinh(), neg_inf);
1770 assert!(nan.asinh().is_nan());
1771 assert_approx_eq!(2.0f32.asinh(), 1.443635475178810342493276740273105f32);
1772 assert_approx_eq!((-2.0f32).asinh(), -1.443635475178810342493276740273105f32);
1777 assert_eq!(1.0f32.acosh(), 0.0f32);
1778 assert!(0.999f32.acosh().is_nan());
1780 let inf: f32 = f32::INFINITY;
1781 let neg_inf: f32 = f32::NEG_INFINITY;
1782 let nan: f32 = f32::NAN;
1783 assert_eq!(inf.acosh(), inf);
1784 assert!(neg_inf.acosh().is_nan());
1785 assert!(nan.acosh().is_nan());
1786 assert_approx_eq!(2.0f32.acosh(), 1.31695789692481670862504634730796844f32);
1787 assert_approx_eq!(3.0f32.acosh(), 1.76274717403908605046521864995958461f32);
1792 assert_eq!(0.0f32.atanh(), 0.0f32);
1793 assert_eq!((-0.0f32).atanh(), -0.0f32);
1795 let inf32: f32 = f32::INFINITY;
1796 let neg_inf32: f32 = f32::NEG_INFINITY;
1797 assert_eq!(1.0f32.atanh(), inf32);
1798 assert_eq!((-1.0f32).atanh(), neg_inf32);
1800 assert!(2f64.atanh().atanh().is_nan());
1801 assert!((-2f64).atanh().atanh().is_nan());
1803 let inf64: f32 = f32::INFINITY;
1804 let neg_inf64: f32 = f32::NEG_INFINITY;
1805 let nan32: f32 = f32::NAN;
1806 assert!(inf64.atanh().is_nan());
1807 assert!(neg_inf64.atanh().is_nan());
1808 assert!(nan32.atanh().is_nan());
1810 assert_approx_eq!(0.5f32.atanh(), 0.54930614433405484569762261846126285f32);
1811 assert_approx_eq!((-0.5f32).atanh(), -0.54930614433405484569762261846126285f32);
1815 fn test_real_consts() {
1818 let pi: f32 = consts::PI;
1819 let frac_pi_2: f32 = consts::FRAC_PI_2;
1820 let frac_pi_3: f32 = consts::FRAC_PI_3;
1821 let frac_pi_4: f32 = consts::FRAC_PI_4;
1822 let frac_pi_6: f32 = consts::FRAC_PI_6;
1823 let frac_pi_8: f32 = consts::FRAC_PI_8;
1824 let frac_1_pi: f32 = consts::FRAC_1_PI;
1825 let frac_2_pi: f32 = consts::FRAC_2_PI;
1826 let frac_2_sqrtpi: f32 = consts::FRAC_2_SQRT_PI;
1827 let sqrt2: f32 = consts::SQRT_2;
1828 let frac_1_sqrt2: f32 = consts::FRAC_1_SQRT_2;
1829 let e: f32 = consts::E;
1830 let log2_e: f32 = consts::LOG2_E;
1831 let log10_e: f32 = consts::LOG10_E;
1832 let ln_2: f32 = consts::LN_2;
1833 let ln_10: f32 = consts::LN_10;
1835 assert_approx_eq!(frac_pi_2, pi / 2f32);
1836 assert_approx_eq!(frac_pi_3, pi / 3f32);
1837 assert_approx_eq!(frac_pi_4, pi / 4f32);
1838 assert_approx_eq!(frac_pi_6, pi / 6f32);
1839 assert_approx_eq!(frac_pi_8, pi / 8f32);
1840 assert_approx_eq!(frac_1_pi, 1f32 / pi);
1841 assert_approx_eq!(frac_2_pi, 2f32 / pi);
1842 assert_approx_eq!(frac_2_sqrtpi, 2f32 / pi.sqrt());
1843 assert_approx_eq!(sqrt2, 2f32.sqrt());
1844 assert_approx_eq!(frac_1_sqrt2, 1f32 / 2f32.sqrt());
1845 assert_approx_eq!(log2_e, e.log2());
1846 assert_approx_eq!(log10_e, e.log10());
1847 assert_approx_eq!(ln_2, 2f32.ln());
1848 assert_approx_eq!(ln_10, 10f32.ln());