How can I detect if a float has a repeating decimal expansion in C#?

Question

I simply need to know how I can detect repeating decimal expansion in floats.

Example:

0.123456789123456789

The repeating portion of the number would

Answer 1

you can't detect period like in your example as for representation in base 10, precision of float is 7 digits.

http://msdn.microsoft.com/en-us/library/aa691146%28v=vs.71%29.aspx