Black Lives Matter. Support the Equal Justice Initiative.

# 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
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  	if haveArchModf {
15  		return archModf(f)
16  	}
17  	return modf(f)
18  }
19
20  func modf(f float64) (int float64, frac float64) {
21  	if f < 1 {
22  		switch {
23  		case f < 0:
24  			int, frac = Modf(-f)
25  			return -int, -frac
26  		case f == 0:
27  			return f, f // Return -0, -0 when f == -0
28  		}
29  		return 0, f
30  	}
31
32  	x := Float64bits(f)
33  	e := uint(x>>shift)&mask - bias
34
35  	// Keep the top 12+e bits, the integer part; clear the rest.
36  	if e < 64-12 {
37  		x &^= 1<<(64-12-e) - 1
38  	}
39  	int = Float64frombits(x)
40  	frac = f - int
41  	return
42  }
43
```

View as plain text