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Gregory Millan
3,719 PointsDoubles and Floats...When to use them?
From my understanding of the video i thought Floats were supposed to be the type if the decimal number was 7 digits or less and Double when its 15 or less.
I tried to list the 9.99 as a Float type in the quiz but I was wrong, can any body help me
1 Answer
Jacob Bergdahl
29,118 PointsDouble is used by default in Swift, and is also more precise than float. Float demand less of the CPU, but it's not really noticeable on a modern device. It's almost always better to use double, however, for financial software, neither double nor float is precise enough, but that's a more complicated story.
Gregory Millan
3,719 PointsGregory Millan
3,719 PointsYou brought some understanding of the subject to me but I still don't understand the decimal place part. Outside of swift if I'm dealing with smaller numbers or numbers with less decimal places should I use Float?
Jacob Bergdahl
29,118 PointsJacob Bergdahl
29,118 PointsThere is no such generalization. Different programming languages may work a little bit differently. Some even have a third option named decimal. Generally, a float is 32-bit while a double is 64-bit. Sure, you could use a float for smaller numbers, but there's rarely a reason to do so. Again, it's almost always better to use double.