Formatting for fixed-width with _two_ decimal places is resulting in _three_

[tonyelewis]

I expect the expression:

fmt::format( "{:.2f}", 0.01 )

…to result in "0.01"s but it's returning "0.010"s.

Thanks for all your hard work on this excellent library and on standardising it.

[tonyelewis]

In another example, I expect the expression:

fmt::format( "{:7.3f}", 1E-35F )

…to result in " 0.000"s ^{_{(two spaces)}} but it's returning "1.00e-35"s. Am I misunderstanding f?

[tonyelewis]

In case I am misunderstanding…

The above two results are consistent with the number between the . and the f specifying the fixed-width's number of significant figures rather than decimal places. But the docs say it indicates:

how many digits should be displayed after the decimal point

…and the expression:

::fmt::format( "{:.2f}", 0.01F )

…returns "0.01"s.

[vitaut]

Thanks for reporting. The new floating-point formatting algorithm is being integrated into the master branch thus some temporary formatting weirdness. This will be addressed soon and in the meantime I recommend using one of the stable releases.

[vitaut]

I've also disabled the new algorithm for fixed formatting for now: d560dda, so your examples should produce expected results.

[tonyelewis]

Ah, OK. Thanks for the quick response and for fixing master. I've reverted to 5.3.0 and my tests now pass cleanly. I'm happy for this issue to be closed.

Again thanks for all you work on the library and on standardisation.

[vitaut]

Fixed in 3466d9c and 49d244c.

[tonyelewis]

Great stuff. Thanks for addressing this so quickly.