fmt: wrong output for format %g

[gopherbot]

by trukenmueller:

package main
import (
        "fmt"
)
func main() {
        var x float64
        x = 1.0/9.0
        fmt.Printf("%g %f\n",x,x)
}


What is the expected output?
0.111111 0.111111

%g should produce a short form (at least not longer than %f)

What do you see instead?
0.1111111111111111 0.111111

What is your $GOOS?  $GOARCH? linux 386


Which revision are you using?  (hg identify)
84e097972fa7 tip

[gopherbot]

Comment 1 by trukenmueller:

fix is submitted for review: http://golang.org/cl/183070

[rsc]

Comment 2:

%g in Go is different from %g in C.
%g in Go means print as many digits as are necessary
for strconv.Atof64 or strconv.Atof32 (depending on
the type being printed) to reconstruct exactly the
same value.
To limit the number of digits (and give up this property)
use a size modifier as in %6g.

Owner changed to r...@golang.org.

Status changed to WorkingAsIntended.