Eric,
For example,
package main
import (
"fmt"
"runtime"
)
func main() {
// Correctly prints "+0 00\n" as +00 00
fmt.Printf("%s: %+03d %02d\n", runtime.Version(), 0, 0)
}
Output:
go1.10.3: +00 00
Playground: https://play.golang.org/p/Pt2-YJfQvEo
Widths three and two.
Peter
On Tuesday, August 28, 2018 at 4:49:02 PM UTC-4, peterGo wrote:
>
> Eric,
>
> "Width is specified by an optional decimal number immediately preceding
> the verb. If absent, the width is whatever is necessary to represent the
> value. "
>
> https://golang.org/pkg/fmt/
>
> Width is two.
>
> Peter
>
> On Tuesday, August 28, 2018 at 12:09:26 PM UTC-4, Eric Raymond wrote:
>>
>> Under Go 1.10.1, feeding an 0 value to a %+02d specifier sometimes
>> yields "+0", not "+00". The attached tiny Go program may reproduce this
>> behavior. I say "may" because I first observed it in a series of unit
>> tests of date format conversions - in different format strings %+02d
>> expanded differently. I haven't found a pattern to this, or I'd report it.
>> On my system this program, at least, has repeatable behavior.
>>
>> If this behavior were consistent, I'm not sure it would be a bug. It's
>> possible that the sign is supposed to be counted as part of the number
>> width; if so, it's an interesting question whether this is the right thing
>> when explicit sign is forced by +. The documentation is unclear.
>>
>> The apparent inconsistency worries me. There may be some state in the
>> form,at-interpretation code that is not always tracked correctly.
>>
>> In accordance with the Contribution Guidelines, I'm tossing the question
>> out here for a sanity check before throwing it on the bugtracker. Have
>> there been any similar reports?
>>
>
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