Which C# double literal is not exactly representable as double?

Question

Wikipedia says:

For example, the decimal number 0.1 is not representable in binary floating-point of any finite precision

Howe

Answer 1

The BCL cheats here by giving you a rounded value when you print it. There should be no literal that prints a different representation or accuracy.

Which is nice, in that it matches intuition most of the time. But so far I haven't found a nice way of getting the exact value to print.