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| 1 // $G $F.go && $L $F.$A && ./$A.out |
| 2 |
| 3 // Copyright 2010 The Go Authors. All rights reserved. |
| 4 // Use of this source code is governed by a BSD-style |
| 5 // license that can be found in the LICENSE file. |
| 6 |
| 7 package main |
| 8 |
| 9 import ( |
| 10 "fmt" |
| 11 "math" |
| 12 ) |
| 13 |
| 14 func main() { |
| 15 var a float64 = math.MaxFloat64 |
| 16 check("a := MaxFloat64; a*a/a", a*a/a, math.Inf(1)) |
| 17 a = math.SmallestNonzeroFloat64 |
| 18 check("a := SmallestNonzeroFloat64; a*a/a", a*a/a, 0) |
| 19 var b float32 = math.MaxFloat32 |
| 20 check("b := MaxFloat32; b*b/b", float64(b*b/b), math.Inf(1)) |
| 21 b = math.SmallestNonzeroFloat32 |
| 22 check("b := SmallestNonzeroFloat32; b*b/b", float64(b*b/b), 0) |
| 23 var h, i float64 = 1.3333333333333333, 1e+308 |
| 24 check("1.3333333333333333/1e+308", h/i, 1.333333333333333e-308) |
| 25 h = 3.3376107877608026e-308 |
| 26 i = 4.503599627370497e+15 |
| 27 check("3.3376107877608026e-308/4.503599627370497e+15", h/i, 5e-324) |
| 28 } |
| 29 |
| 30 var bad = false |
| 31 |
| 32 func check(name string, a, b float64) { |
| 33 if a == b { |
| 34 return |
| 35 } |
| 36 if !bad { |
| 37 bad = true |
| 38 fmt.Println("BUG: float") |
| 39 } |
| 40 fmt.Printf("%s = %g, want %g\n", name, a, b) |
| 41 } |
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