I will attempt to figure out some format from the number. I have a number that could be in more than one format (decimal, exponential). I will try to figure out what format it is in just by analyzing the number as I see it. I will guess at the format, just from seeing the number. Vmusic is right, though. I am guessing here. As an engineer, I can guess that the situation where you would use this would exist.

something is wrong with this sentence, because it doesn't make sense. “format out of the number"? format means the way something is made or set to present it - it is not clear "format out"