In C#, there's a "decimal" type. Which is exactly that - decimal floating-point. However, one catch about it is that it doesn't allow for the exponent that would place the decimal point somewhere outside of the representable digits of the number (i.e. unlike floats, the difference between any two decimals is never more than 1).

But it's still plenty useful, because it allows to accurately represent decimal fractional numbers, which is exactly what's needed in many domains, since humans work with decimal fractional numbers. Representing money would be one particular example.