WEBVTT 00:01.680 --> 00:07.890 An array is a series of elements with the same data type that is placed in contiguous memory locations. 00:07.890 --> 00:12.880 So this means that the memory location is assigned in consecutive memory blocks. 00:12.900 --> 00:18.690 Since it implements the contiguous memory locations, the elements of the array can be individually 00:18.690 --> 00:20.490 accessed by the index. 00:20.490 --> 00:23.730 So let's take a look at this diagram here. 00:25.330 --> 00:25.690 Here. 00:25.690 --> 00:28.610 Let's say we have the five array. 00:28.630 --> 00:32.470 So these are the memory addresses here. 00:32.470 --> 00:38.080 So let's actually write it, the memory actually here. 00:38.500 --> 00:44.940 So these are the memory addresses we will write here here by now. 00:44.950 --> 00:48.430 So these are the memory address. 00:49.610 --> 00:56.060 And we here we have the also we also have. 00:57.080 --> 01:07.700 The and are here at the bottom that we write as 012, three, four is indexed of our array. 01:07.970 --> 01:11.900 So here these are the index. 01:13.240 --> 01:16.330 And as you can see, let's actually put some variables in them. 01:16.450 --> 01:21.640 So here, let's say we have the 21. 01:22.060 --> 01:23.780 Oops, not like this. 01:23.800 --> 01:24.790 We just want it here. 01:24.790 --> 01:25.410 Marker. 01:25.420 --> 01:29.800 So here, let's say this is 21 here. 01:31.280 --> 01:32.660 21. 01:32.660 --> 01:37.730 And this one in the first index is 47. 01:38.510 --> 01:41.210 And then 87. 01:44.470 --> 01:46.120 69. 01:48.210 --> 01:49.080 And. 01:49.790 --> 01:51.590 35. 01:53.550 --> 01:53.860 Mm hmm. 01:54.560 --> 02:04.380 And here, as you can see here in this illustration, we have an array and containing five elements. 02:04.400 --> 02:11.060 So since the array uses zero zero based indexing, the index starts from zero. 02:11.960 --> 02:17.430 So this index is used to access the element value and also replace the element value. 02:17.450 --> 02:23.060 So the memory state address is state in the illustration is, for example, purposes only. 02:23.420 --> 02:25.070 You can see here. 02:25.730 --> 02:30.920 So this is just an example purposes only in your actual computer. 02:31.640 --> 02:34.700 In reality, the memory address might be different. 02:34.700 --> 02:39.650 So however, it illustrates that the memory allocation is contiguous here. 02:41.560 --> 02:46.720 But sometimes it might differentiate and like memory location might be random here, which you will 02:46.720 --> 02:50.220 learn about them in next lectures. 02:50.230 --> 02:58.140 So now if we want to access the preceding array or let's actually create this array in C plus plus code. 02:58.150 --> 02:59.410 So let's get started first. 02:59.410 --> 03:02.620 Actually, let's make it the bit right here. 03:02.650 --> 03:03.220 Oops. 03:03.250 --> 03:05.380 How can we select all of them? 03:06.010 --> 03:07.090 I guess we can't. 03:10.260 --> 03:11.610 Yes, we guess we. 03:12.950 --> 03:13.580 Here. 03:16.590 --> 03:17.460 These are the copy. 03:17.460 --> 03:19.830 Yeah, we can hear. 03:19.830 --> 03:21.270 So make this here. 03:21.360 --> 03:23.610 Get this marker here. 03:23.610 --> 03:25.080 Uh, the cursor here. 03:25.080 --> 03:28.860 So first we implemented using STD here. 03:29.630 --> 03:32.960 And also your stream because we're going to use the key out and other. 03:33.910 --> 03:34.570 Functions. 03:34.570 --> 03:37.900 And here we're going to initialize an array here. 03:37.900 --> 03:40.360 So our first array integer. 03:41.110 --> 03:42.460 Integer. 03:42.490 --> 03:47.200 Integer array here or my array and here. 03:47.200 --> 03:49.810 It's going to be the 21. 03:50.610 --> 03:51.750 47. 03:53.400 --> 03:58.770 47, 87, 69 and 35. 03:58.890 --> 04:05.070 And as you can see here, the IntelliJ idea tells us that this is here. 04:05.340 --> 04:11.010 Let's actually, as you can see here, the index zero here, index zero here. 04:12.760 --> 04:14.740 Index zero is 21. 04:14.980 --> 04:15.940 As you can see here. 04:15.940 --> 04:17.830 It writes it like that. 04:19.360 --> 04:20.230 Oh, here. 04:20.880 --> 04:22.560 Index is 21. 04:22.590 --> 04:26.520 The index one is 47. 04:26.550 --> 04:29.010 Index two is 87. 04:29.040 --> 04:35.790 The index three is 69 and index four is 35. 04:36.720 --> 04:37.440 Here. 04:37.440 --> 04:42.750 So now we need to access each element after this code here. 04:42.750 --> 04:49.560 So let's actually create a get the cursor here and now we're going to access elements with this key 04:49.740 --> 04:53.940 firstly, so we tell the user that we are array elements. 04:54.180 --> 04:59.280 Array elements are or array elements, just an array elements. 04:59.280 --> 05:00.660 And after that. 05:02.310 --> 05:06.000 Here in the line at the here. 05:06.970 --> 05:07.990 And now. 05:08.890 --> 05:10.250 We're going to create a for loop. 05:10.270 --> 05:23.170 So for integer for integer here, zero while the integer is E is less than size of our array, size 05:23.170 --> 05:27.730 of our array or my array size of my array. 05:27.760 --> 05:36.580 Then so size of we will also need to get an integer size so we will divide size of our pointer array 05:36.580 --> 05:38.980 here, my array. 05:39.280 --> 05:49.270 And after that we will increment e by one in each iteration and we will print this of course here array 05:49.300 --> 05:50.440 my array. 05:50.560 --> 05:58.090 My array here is E and here after that inline. 05:59.990 --> 06:00.220 Line. 06:01.860 --> 06:02.830 So that's it. 06:02.850 --> 06:05.970 So let's actually run our program and see what happens. 06:05.970 --> 06:08.220 So first let's go to Command Prompt. 06:11.320 --> 06:12.220 Full screen. 06:14.020 --> 06:15.160 Our file was. 06:15.160 --> 06:15.520 Yeah. 06:15.560 --> 06:19.180 G++ main.cpp a dot exe here. 06:19.180 --> 06:27.550 And as you can see here, array element starts from the 21 actually let's make is like that array elements 06:27.550 --> 06:29.260 after that new line. 06:29.260 --> 06:35.740 But instead of new line we can also write it like this and line here it's the it will give us an same 06:35.770 --> 06:41.220 output compile it again close and open a dot XM. 06:41.230 --> 06:49.720 So as you can see here, we have here our array elements is first array element is 21, then we have 06:49.720 --> 06:53.770 47, then we have 87. 06:54.940 --> 06:59.950 And then we have 69 and then we have 35 here. 07:00.670 --> 07:09.520 So now let's actually try to manipulate our array elements in the next lecture. 07:09.520 --> 07:11.380 So I'm waiting you in the next lecture.