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Source file src/math/modf.go

Documentation: math

     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  //	Modf(±Inf) = ±Inf, NaN
    12  //	Modf(NaN) = NaN, NaN
    13  func Modf(f float64) (int float64, frac float64)
    14  
    15  func modf(f float64) (int float64, frac float64) {
    16  	if f < 1 {
    17  		switch {
    18  		case f < 0:
    19  			int, frac = Modf(-f)
    20  			return -int, -frac
    21  		case f == 0:
    22  			return f, f // Return -0, -0 when f == -0
    23  		}
    24  		return 0, f
    25  	}
    26  
    27  	x := Float64bits(f)
    28  	e := uint(x>>shift)&mask - bias
    29  
    30  	// Keep the top 12+e bits, the integer part; clear the rest.
    31  	if e < 64-12 {
    32  		x &^= 1<<(64-12-e) - 1
    33  	}
    34  	int = Float64frombits(x)
    35  	frac = f - int
    36  	return
    37  }
    38  

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