github.com/primecitizens/pcz/std@v0.2.1/math/modf.go (about)

     1  // Copyright 2009 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package math
     6  
     7  // Modf returns integer and fractional floating-point numbers
     8  // that sum to f. Both values have the same sign as f.
     9  //
    10  // Special cases are:
    11  //
    12  //	Modf(±Inf) = ±Inf, NaN
    13  //	Modf(NaN) = NaN, NaN
    14  func Modf(f float64) (int float64, frac float64) {
    15  	return modf(f)
    16  }
    17  
    18  func modf(f float64) (int float64, frac float64) {
    19  	if f < 1 {
    20  		switch {
    21  		case f < 0:
    22  			int, frac = Modf(-f)
    23  			return -int, -frac
    24  		case f == 0:
    25  			return f, f // Return -0, -0 when f == -0
    26  		}
    27  		return 0, f
    28  	}
    29  
    30  	x := Float64bits(f)
    31  	e := uint(x>>shift)&mask - bias
    32  
    33  	// Keep the top 12+e bits, the integer part; clear the rest.
    34  	if e < 64-12 {
    35  		x &^= 1<<(64-12-e) - 1
    36  	}
    37  	int = Float64frombits(x)
    38  	frac = f - int
    39  	return
    40  }