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Source file test/fixedbugs/bug470.go

Documentation: test/fixedbugs

     1  // run
     2  
     3  // Copyright 2012 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  // Converting constants between types must introduce rounding.
     8  
     9  package main
    10  
    11  import "fmt"
    12  
    13  const (
    14      F32 = 0.00999999977648258209228515625
    15      F64 = 0.01000000000000000020816681711721685132943093776702880859375
    16  )
    17  
    18  var F = float64(float32(0.01))
    19  
    20  func main() {
    21  	// 0.01 rounded to float32 then to float64 is F32.
    22  	// 0.01 represented directly in float64 is F64.
    23  	if F != F32 {
    24  		panic(fmt.Sprintf("F=%.1000g, want %.1000g", F, F32))
    25  	}
    26  }
    27  

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