WEBVTT 00:00.150 --> 00:04.380 In this listen, I am going to introduce the switch structure to you. 00:04.680 --> 00:07.700 OK, so we are going simply to modify this. 00:08.010 --> 00:09.990 We are not going to change anything in the program. 00:10.200 --> 00:14.110 So please make sure that you know how to make the numbers OK. 00:14.370 --> 00:18.060 I'm simply going to modify this structure with the switch. 00:18.360 --> 00:24.270 So we have not seen the switch before because actually you don't need a switch that often and it only 00:24.270 --> 00:30.370 works in specific situations like here when you basically need to check, OK. 00:30.600 --> 00:35.970 You have an integer, OK, or you have a wrong number can be an additional number as well. 00:36.360 --> 00:40.320 And you simply want to take different values for the number. 00:40.360 --> 00:47.070 OK, so you can use that if anything else, else, cetera, etc. that's going to work and that is perfectly 00:47.070 --> 00:47.400 fine. 00:47.670 --> 00:51.570 But you have to know there is another structure that is maybe a little bit more reliable. 00:51.780 --> 00:53.350 Some people prefer to switch. 00:53.370 --> 00:58.820 Some people prefer that if if I'm going to show you the switch and then you can decide for yourself. 00:59.190 --> 01:01.230 So let's commence this. 01:02.070 --> 01:04.050 I'm going to do commence. 01:05.700 --> 01:09.240 So the first thing you need to have is first what you want to test. 01:09.270 --> 01:12.480 So here we have an integer command, which is what we get here. 01:12.750 --> 01:17.870 So if you have the version two, you are going to do we have the original structure. 01:17.880 --> 01:25.760 You are going to do results that value certain results that value for versioned and for version three. 01:25.770 --> 01:26.130 That's. 01:26.640 --> 01:30.570 And now the switch will be the same for version two and three. 01:31.470 --> 01:34.600 So let's just right the switch so you can understand. 01:34.620 --> 01:36.600 So switch it. 01:36.600 --> 01:38.280 You can see it turn green. 01:38.520 --> 01:40.830 You're going to switch and in parentheses. 01:40.830 --> 01:43.860 And that is what you want to test here, the command. 01:44.130 --> 01:47.190 And then you are going to open and close curly brackets. 01:47.730 --> 01:50.850 And in that switch, you are going to use the key keyword case. 01:51.570 --> 01:58.500 And for the case, for example, you are going to first try your case where the command is equal to 01:58.530 --> 02:00.180 I am button zero. 02:00.540 --> 02:07.620 So you two keys and then space and then what you want to divide you, you want to test and then a column 02:08.490 --> 02:14.520 and you go back to new line with indentation and you can do some action, let's say celluloid print. 02:14.520 --> 02:17.500 Ellen Button zero. 02:17.910 --> 02:18.270 OK. 02:20.070 --> 02:25.910 And then that's very important, you need to use the word break and then you go back to a new line, 02:25.980 --> 02:27.270 you can do Kaze. 02:29.050 --> 02:34.010 I button one with a column and go back to New Line so that. 02:35.380 --> 02:38.860 Rent Ellen Button one. 02:40.280 --> 02:47.780 And then, Rich, don't forget the break, so you can see you can do as many case as you want. 02:48.620 --> 02:54.710 Case for button zero, one, two, three, nine, whatever, this is simply the same as if you use if 02:54.780 --> 02:59.000 if you forgive it here, maybe you have a better way to. 02:59.030 --> 03:00.130 It's maybe more ready. 03:00.200 --> 03:08.030 OK, one thing here you have keys and then you don't have any curly braces here and well that's going 03:08.030 --> 03:08.540 to work. 03:08.960 --> 03:14.760 But I'm actually not a big fan of this, so I'm going to add braces here and here. 03:15.290 --> 03:20.960 So you may add or not add those curly braces, but I'm going to add them into programs. 03:21.770 --> 03:28.820 So the value column and braces here and then inside, you know that this is the block for this. 03:29.090 --> 03:30.570 So you do whatever you want. 03:30.590 --> 03:36.860 So this is just one line, but you can use as many lines as you want, called functions, etc. and then 03:36.860 --> 03:45.570 you use the break that you use that for all the cases you want to test and then at the end. 03:45.650 --> 03:50.420 So actually, these are the keys here to make the exact same. 03:52.800 --> 03:57.010 He Sanyal dot print, Ellen button play. 03:58.920 --> 04:07.010 And don't forget the bridge and then you will have so if you want to, else you can use default. 04:08.160 --> 04:13.130 So basically this would be the switch when you switch with command. 04:13.440 --> 04:16.410 This will first check if the command is equal to that. 04:16.410 --> 04:21.430 If, yes, you execute the look of code and because of break, then you break out of the switch. 04:21.450 --> 04:26.520 That's important because if you don't use break, it's going to continue with the different blocks of 04:26.520 --> 04:26.830 code. 04:27.210 --> 04:31.700 So first we check that if yes, we go here, we break out of the switch. 04:32.250 --> 04:36.120 If it's not this, we check this one with addiction and we break. 04:36.390 --> 04:40.170 If it's not, is this we check this one, OK, etc.. 04:40.170 --> 04:46.170 And if we have checked all the three and nothing corresponds to the command, then we are going to go 04:46.170 --> 04:47.130 into default. 04:48.150 --> 04:56.310 Bluck and let's say a print and then let's say invalid data. 04:58.440 --> 05:04.050 So that is the sense that we have here and know that this is important in the default, you don't have 05:04.050 --> 05:04.470 a break. 05:04.470 --> 05:09.090 I mean, you could use a break that will not change anything, but you don't have to write one. 05:09.630 --> 05:14.790 And it's very important, actually, that you create a default case for your speech. 05:15.330 --> 05:20.430 This is not mandatory means that if you don't write this, your program will still work. 05:20.640 --> 05:26.700 But this is a super, super important best practice that you use a default when you use a switch. 05:27.630 --> 05:36.030 So if all of the cases are checked, but none of them correspond to the number you try to check here, 05:36.420 --> 05:38.480 then you are going to get the default. 05:38.580 --> 05:42.780 So you can, for example, print the message, set an error, flag our assumptions. 05:43.080 --> 05:43.410 All right. 05:43.440 --> 05:49.820 So to recap what you want to try here, what you test should always be around numbers that can be an 05:49.830 --> 05:54.690 integer that you use, for example, with decimal number or hexadecimal number. 05:54.690 --> 05:57.350 And the same can be a binary data. 05:57.360 --> 05:59.220 It can be a long number. 05:59.430 --> 06:01.590 OK, but don't use float. 06:01.590 --> 06:02.680 Don't use string. 06:02.680 --> 06:04.590 OK, only round number. 06:04.800 --> 06:08.970 OK, and then you use a case statement for each case you want to test. 06:09.240 --> 06:15.360 You use break at the end of your keys every time and then at the end you have a default. 06:15.720 --> 06:20.560 If the command does not correspond to any of the keys you have added you. 06:20.920 --> 06:26.700 OK, so you can see here the switch and if it's OK, that's the exact same thing. 06:27.300 --> 06:30.660 But the switch is quite appropriate for that. 06:30.660 --> 06:33.870 Use keys, OK, when you just want to test the value. 06:34.380 --> 06:41.010 So that's why I'm only showing it to you now, because that's basically the only use case when you need 06:41.010 --> 06:41.610 a switch. 06:42.000 --> 06:44.760 So now let's run the program to see if it works. 06:47.310 --> 06:55.590 OK, let's open to stand tall and let's price one, for example, button one next price to invalidate 06:55.590 --> 06:56.850 all its price, zero. 06:58.690 --> 07:04.390 We have button zero and it's price would we have played button plate and any other? 07:05.630 --> 07:08.150 Stuff that the press we give invalid data. 07:08.580 --> 07:17.060 OK, so that was the exact same way it worked with if Essive and as you can see now, if you have correctly 07:17.060 --> 07:25.520 defined he and not your button, whether with version two or three and using the decimal hexadecimal 07:25.520 --> 07:26.730 base for the number. 07:27.050 --> 07:28.490 Well, the code is the same. 07:28.540 --> 07:29.600 OK, all right. 07:29.610 --> 07:32.790 So now you know how to use the infrared remote control. 07:32.930 --> 07:40.070 You know how to map the different buttons in your code and you know how to handle each case to do an 07:40.070 --> 07:42.080 action for each number you want.