affected/package: standard implementation of division by 0

[codelinx]

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

$ go version 1.21.3

Does this issue reproduce with the latest release?

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

go env Output

$ go env
GO111MODULE=''

GOARCH='amd64'

GOBIN=''

GOCACHE='/home/USERNAME/.cache/go-build'

GOENV='/home/USERNAME/.config/go/env'

GOEXE=''

GOEXPERIMENT=''

GOFLAGS=''

GOHOSTARCH='amd64'

GOHOSTOS='linux'

GOINSECURE=''

GOMODCACHE='/home/USERNAME/go/pkg/mod'

GONOPROXY=''

GONOSUMDB=''

GOOS='linux'

GOPATH='/home/USERNAME/go'

GOPRIVATE=''

GOPROXY='https://proxy.golang.org,direct'

GOROOT='/usr/local/go'

GOSUMDB='sum.golang.org'

GOTMPDIR=''

GOTOOLCHAIN='auto'

GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'

GOVCS=''

GOVERSION='go1.21.3'

GCCGO='gccgo'

GOAMD64='v1'

AR='ar'

CC='gcc'

CXX='g++'

CGO_ENABLED='1'

GOMOD='/dev/null'

GOWORK=''

CGO_CFLAGS='-O2 -g'

CGO_CPPFLAGS=''

CGO_CXXFLAGS='-O2 -g'

CGO_FFLAGS='-O2 -g'

CGO_LDFLAGS='-O2 -g'

PKG_CONFIG='pkg-config'

GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build1569631650=/tmp/go-build -gno-record-gcc-switches'

What did you do?

Division by 0 panic

What did you expect to see?

Expected: value at iteration + 1 to evaluate to 1 + iteration of range and not a panic as if 0 was the total value being divided by

n := len(s)/i + 1 // expected for division to start with numerator 1 + current count ie. at least 1

Working version:

n := len(s)/1 + i  // expected for division to start with numerator 1 + current count ie. at least 1

What did you see instead?

[Fatal panic:](panic: runtime error: integer divide by zero)

[mauri870]

Check the Operator precedence section https://go.dev/ref/spec

That is expected behavior, the / operator has a higher precedence than +.

[codelinx]

thanks! wrapping the values in parenthesis fixes the issue and you are correct the operator precedence is the issue:
n := len(s)/ (1 + i) or flipping the values works n := len(s)/ 1+ i