Say I have a float X. I want to find the largest number that is less than X and can be losslessly stored in a float.

IIRC the IEEE standard says you can do this by converting the float's bits to an int representation, subtracting one, and convert back to float.

(edit: this is true for positive numbers that are not NaN or inf. For negative numbers, you must add. See Rawling's answer for more info.)

To change between representations, I only know of C#'s (cast) operator, which truncates. That's not what I want.

Is there a way to do this in C#?

c# floating-point
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