floating point issue

Question

I have a floating value as 0.1 entering from UI.

But, while converting that string to float i am getting as 0.10...01. The problem is the appending of non zero dig

Answer 1

Since floats get stored in binary, the fractional portion is effectively in base-two... and one-tenth is a repeating decimal in base two, same as one-ninth is in base ten.

The most common ways to deal with this are to store your values as appropriately-scaled integers, as in the C# or SQL currency types, or to round off floating-point numbers when you display them.