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go/test/fixedbugs/bug470.go
Ian Lance Taylor 76fa4f430a test: add test for floating point rounding of constants
Failed with gccgo.

R=golang-dev, remyoudompheng, rsc
CC=golang-dev
https://golang.org/cl/6855053
2012-11-26 08:31:15 -08:00

27 lines
609 B
Go

// run
// Copyright 2012 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.
// Converting constants between types must introduce rounding.
package main
import "fmt"
const (
F32 = 0.00999999977648258209228515625
F64 = 0.01000000000000000020816681711721685132943093776702880859375
)
var F = float64(float32(0.01))
func main() {
// 0.01 rounded to float32 then to float64 is F32.
// 0.01 represented directly in float64 is F64.
if F != F32 {
panic(fmt.Sprintf("F=%.1000g, want %.1000g", F, F32))
}
}