It's safer to place the modifier before the final letter (e.g. %.3Zf) or to pick a different letter (e.g. %.3F). That way, it doesn't restrict the strings into which the pattern can be placed.

I wonder what C# does.

In reply to Re^4: Can sprintf suppress leading zero for float < 1? by ikegami
in thread Can sprintf suppress leading zero for float < 1? by RotoValue

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