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strconv: rounding #55056

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JRoper18 opened this issue Sep 13, 2022 · 1 comment
Closed

strconv: rounding #55056

JRoper18 opened this issue Sep 13, 2022 · 1 comment
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@JRoper18
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JRoper18 commented Sep 13, 2022 •
edited

What version of Go are you using (go version)?

$ go version
go version go1.19.1 darwin/arm64

Does this issue reproduce with the latest release?

This is the latest re

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE="on"
GOARCH="arm64"
GOBIN=""
GOCACHE=
GOENV=
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="arm64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/jroper/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/jroper/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_arm64"
GOVCS=""
GOVERSION="go1.19.1"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=
GOWORK=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/ky/_xmwdrp16cg45kk2znpb0xqc0000gn/T/go-build2189227028=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

See https://go.dev/play/p/8_0ETuSnOcj
I used the strconv to convert a string of a (very large) float to a float.

What did you expect to see?

I was hoping to either see the original value, or an error if some floating point precision had been lost. For the example provided, I hoped that either 9999999999999905 would be the returned number, or that I would get an error.

What did you see instead?

9999999999999904, and no error.
@JRoper18 JRoper18 changed the title affected/package: bug/feature? strconv large floating-point parsing Sep 13, 2022
@seankhliao
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working as intended, see function docs.

@seankhliao seankhliao closed this as not planned Won't fix, can't repro, duplicate, stale Sep 13, 2022
@JRoper18 JRoper18 changed the title bug/feature? strconv large floating-point parsing strconv bug/feature? large floating-point parsing Sep 13, 2022
@seankhliao seankhliao changed the title strconv bug/feature? large floating-point parsing strconv: rounding Sep 13, 2022
@golang golang locked and limited conversation to collaborators Sep 13, 2023
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