You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
47 lines
724 B
47 lines
724 B
// run
|
|
|
|
// Copyright 2018 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 main
|
|
|
|
import (
|
|
"math"
|
|
)
|
|
|
|
type S struct {
|
|
u int64
|
|
n int32
|
|
}
|
|
|
|
func F1(f float64) *S {
|
|
s := f
|
|
pf := math.Copysign(f, 1)
|
|
u := math.Floor(pf)
|
|
return &S{
|
|
u: int64(math.Copysign(u, s)),
|
|
n: int32(math.Copysign((pf-u)*1e9, s)),
|
|
}
|
|
}
|
|
|
|
func F2(f float64) *S {
|
|
s := f
|
|
f = math.Copysign(f, 1)
|
|
u := math.Floor(f)
|
|
return &S{
|
|
u: int64(math.Copysign(u, s)),
|
|
n: int32(math.Copysign((f-u)*1e9, s)),
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
s1 := F1(-1)
|
|
s2 := F2(-1)
|
|
if *s1 != *s2 {
|
|
println("F1:", s1.u, s1.n)
|
|
println("F2:", s2.u, s2.n)
|
|
panic("different")
|
|
}
|
|
}
|