Question

Does (int)myDouble ever differ from (int)Math.Truncate(myDouble)?

Is there any reason I should prefer one over the other?

Answer 1

Math.Truncate is intended for when you need to keep your result as a double with no fractional part. If you want to convent it to an int, just use the cast directly.

Edit: For reference, here is the relevant documentation from the “Explicit Numeric Conversions Table”:

When you convert from a double or float value to an integral type, the value is truncated.