Math Floats Vs. Ints

Quick reference

• 00:03 Okay, in this video I want to talk about integers versus floats versus decimals
• 00:07 versus doubles, and we've sort of already touched on this a little bit when we
• 00:11 talked about the division stuff a couple of videos ago.
• 00:14 So let's start out by creating some integers, so
• 00:19 let's go int x equals 10 and let's go int y equals 3.
• 00:24 So let's come down here and let's go x divided by y.
• 00:28 So here, 10 divided by three is 3.333333.
• 00:32 What do we think the answer is going to be here?
• 00:36 It can only return whole number integers.
• 00:38 So we get what we would expect three, so it rounds down 3.33333.
• 00:43 0.3 is less than 0.5 so
• 00:46 you would expect it to round down, and the answer is here 3.
• 00:50 Okay, that's what we sort of expect.
• 00:52 But what happens if we do a float for each of these?
• 00:58 And remember, we stick our little f here.
• 01:01 So now, this is going to be a floating point.
• 01:04 So let me just sort of go float and
• 01:08 then let's also do decimal and also double.
• 01:15 So let's see what we get for the answer for
• 01:17 each of these using each of these different data types.
• 01:20 So here we have float.
• 01:22 Let's go ahead and run this.
• 01:23 We get 3.33333.
• 01:25 So there we go, 3.33333.
• 01:27 So what about decimal?
• 01:30 Well, let's change this to decimal and see, so that should be an m.
• 01:34 Remember decimals, and we get 3.33333, much more threes.
• 01:39 So let's go ahead and copy this, stick this in there.
• 01:43 And let me just sort of tab this over so we can compare these more.
• 01:47 And finally we have double, so here let's go double and this is going to be d.
• 01:52 We save this and run it.
• 01:53 We have 3.33335, which is slightly different.
• 01:58 So very different answers, and let's put int in here just for
• 02:02 fun, based on whether you have integers, floats, decimals, and doubles.
• 02:07 Now what happens if we change these to ten point something?
• 02:12 Will this change anything?
• 02:14 Nope, not there.
• 02:16 What about if we change it to decimal, And change this to M?
• 02:25 Save this and run it.
• 02:28 Nope, we still get that big long thing.
• 02:31 And just for good measure, let's go float.
• 02:39 Change this.
• 02:42 Same answer there, it's there, very interesting.
• 02:46 So just sort of keep in mind, if you're using very precise things where
• 02:52 you need to go out to have many decimal places, decimals looks like the way to go.
• 02:58 Double is better than float, it's going to sort of round the last thing.
• 03:02 Float will give you the least of all of them, it seems like.
• 03:06 An integer will just return an integer as we would expect, and
• 03:09 that's all there is to it.
• 03:11 So that's all for this video.
• 03:12 In the next video, we'll look at increment and decrement operators.

Lesson notes are only available for subscribers.