[Sharlin]

Hmm, is that then just an extension that's de facto standard? Every compiler I tried at godbolt.org prints 3.140000 and 3.14 respectively.

[lifthrasiir]

3.14 is the correct answer for both %g and the shortest possible representation. Try 1.0 / 3.0 instead; it won't show all digits required for round-tripping.