Copyright 2009 The Go Authors. All rights reserved. Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.

package math
Modf returns integer and fractional floating-point numbers that sum to f. Both values have the same sign as f. Special cases are: Modf(±Inf) = ±Inf, NaN Modf(NaN) = NaN, NaN
func ( float64) ( float64,  float64)

func ( float64) ( float64,  float64) {
	if  < 1 {
		switch {
		case  < 0:
			,  = Modf(-)
			return -, -
		case  == 0:
			return ,  // Return -0, -0 when f == -0
		}
		return 0, 
	}

	 := Float64bits()
	 := uint(>>shift)&mask - bias
Keep the top 12+e bits, the integer part; clear the rest.
	if  < 64-12 {
		 &^= 1<<(64-12-) - 1
	}
	 = Float64frombits()
	 =  - 
	return