1 00:00:01,560 --> 00:00:02,280 Hi, everyone. 2 00:00:02,400 --> 00:00:03,630 Welcome back to the cause. 3 00:00:04,140 --> 00:00:08,630 So today we will learn a new topic called Dear Friends Fence Operator. 4 00:00:10,170 --> 00:00:10,710 So. 5 00:00:11,990 --> 00:00:13,060 Intake was 10. 6 00:00:16,330 --> 00:00:19,390 And Star B equals and by sendoff, Delphi. 7 00:00:22,120 --> 00:00:22,810 See out. 8 00:00:23,810 --> 00:00:24,540 Address off. 9 00:00:24,940 --> 00:00:26,980 I see out. 10 00:00:30,170 --> 00:00:30,880 See out. 11 00:00:34,770 --> 00:00:37,200 See out defense be. 12 00:00:38,570 --> 00:00:41,210 So let's see where the real output of each line. 13 00:00:41,900 --> 00:00:43,160 So what this line will do? 14 00:00:44,060 --> 00:00:46,280 I will get four bytes of memory space. 15 00:00:47,300 --> 00:00:51,080 Let's say the addresses 700 and the value is. 16 00:00:52,100 --> 00:00:53,480 And this is my symbol table. 17 00:00:57,130 --> 00:01:01,210 So there is a variable eye and it's memory addresses. 18 00:01:01,430 --> 00:01:02,110 700. 19 00:01:05,900 --> 00:01:07,100 So what this land will do? 20 00:01:07,580 --> 00:01:12,230 I will get a pointer B days for bites. 21 00:01:13,940 --> 00:01:16,490 It will restore 700 basically and resolve. 22 00:01:17,360 --> 00:01:19,640 And let's say it addresses 900. 23 00:01:20,670 --> 00:01:26,040 Those days are variable B, there's a point to B, and it addresses nine entered. 24 00:01:27,410 --> 00:01:33,400 See out at so if I some output will be 700 C out B. 25 00:01:33,470 --> 00:01:35,120 So B is 700. 26 00:01:35,120 --> 00:01:36,530 B is containing 700. 27 00:01:36,980 --> 00:01:39,020 So 700 C yesterday. 28 00:01:39,800 --> 00:01:40,250 I will go. 29 00:01:40,330 --> 00:01:42,110 Plus I will go towards the symbol table. 30 00:01:42,200 --> 00:01:43,310 Yes, there is a variable. 31 00:01:43,400 --> 00:01:46,990 I and the variable I is stored at memory location 700. 32 00:01:47,690 --> 00:01:51,820 So I will go to memory location seven ended and the value is ten. 33 00:01:52,310 --> 00:01:54,830 So my output here will be ten. 34 00:01:55,910 --> 00:01:57,170 Now this is something new. 35 00:01:58,940 --> 00:02:01,650 This is something new that we have not seen before. 36 00:02:02,030 --> 00:02:04,720 So this operator is called Dereference Operator. 37 00:02:05,060 --> 00:02:06,170 So what it will do. 38 00:02:06,740 --> 00:02:10,100 It will go to first of all, I will go to various be stored. 39 00:02:11,440 --> 00:02:13,360 So peace to that memory location. 40 00:02:13,450 --> 00:02:14,130 Nine hundred. 41 00:02:14,800 --> 00:02:16,240 So I will go to 900. 42 00:02:18,580 --> 00:02:20,470 Then memory addresses. 43 00:02:20,530 --> 00:02:22,760 So when I did so, I wouldn't go to seven ended. 44 00:02:23,800 --> 00:02:25,750 And then I will print this value. 45 00:02:26,440 --> 00:02:28,300 So basically 10 will be printed here. 46 00:02:28,880 --> 00:02:29,340 Ten. 47 00:02:30,520 --> 00:02:31,510 And then. 48 00:02:33,070 --> 00:02:40,590 OK, so ampersand A and B Botel, same eye and defense. 49 00:02:40,760 --> 00:02:42,520 B, they both the same. 50 00:02:43,540 --> 00:02:47,620 OK, so let's see with the help of an example then I will expand it further. 51 00:02:50,160 --> 00:02:56,180 So I have a variable eye, which is 10 now letters. 52 00:02:57,950 --> 00:03:03,440 That does create a pointer B, which will store the address of A. 53 00:03:06,830 --> 00:03:09,900 Now, let us try to bring the value of high. 54 00:03:10,640 --> 00:03:14,540 And let us also pride to print, also tried to lead offense be. 55 00:03:25,120 --> 00:03:31,750 So what I want to say is the output of line number nine and line number 10 is seam that is then. 56 00:03:36,100 --> 00:03:39,130 So our would coming out to be same Ben and Ben. 57 00:03:44,210 --> 00:03:45,920 So what this line is doing. 58 00:03:49,260 --> 00:03:49,870 Bromates. 59 00:03:51,790 --> 00:03:52,280 Memories. 60 00:03:52,370 --> 00:03:52,850 So an. 61 00:03:53,590 --> 00:03:54,330 Value is. 62 00:03:55,500 --> 00:03:56,680 What this line will do. 63 00:03:59,010 --> 00:04:01,500 Pointer is a four bytes in my system. 64 00:04:03,280 --> 00:04:08,140 It is starting so ended and let's say its addresses, 800 Soucy out. 65 00:04:08,190 --> 00:04:09,430 I means print. 66 00:04:09,460 --> 00:04:13,600 Then with the help of symbol, they will not be in a frenzy. 67 00:04:14,170 --> 00:04:16,540 So this is pointing towards this. 68 00:04:16,600 --> 00:04:24,480 This is a pointer it this pointing towards I so point Burpee is pointing towards. 69 00:04:24,630 --> 00:04:32,500 I did a fence means go to that memory, location and print whatever is stored in it. 70 00:04:32,910 --> 00:04:34,450 So my output will be 10. 71 00:04:35,830 --> 00:04:37,260 OK, so one more time. 72 00:04:38,550 --> 00:04:45,420 I have four bytes of memory space values, 10. 73 00:04:46,870 --> 00:04:48,620 And it's doses seven. 74 00:04:50,000 --> 00:04:52,280 I have, again, four bites of memory space. 75 00:04:53,210 --> 00:04:56,690 This is a pointer, B, it's Ducey's, let's say 800. 76 00:04:56,960 --> 00:04:58,850 And it is pointing towards this. 77 00:05:00,260 --> 00:05:06,680 So when you will try and print the reference B or B, reference B meaning. 78 00:05:06,760 --> 00:05:13,250 So the meaning of the defense B is go to the memory location and print the content. 79 00:05:13,760 --> 00:05:15,670 So that's why Dennis printed here. 80 00:05:16,820 --> 00:05:17,980 OK, so. 81 00:05:19,870 --> 00:05:25,630 Now, a little sprint, and this is so she out and densify. 82 00:05:29,330 --> 00:05:30,780 See out B. 83 00:05:31,520 --> 00:05:38,390 So the output will be seem so big because B is containing the address of I only. 84 00:05:41,730 --> 00:05:43,740 OK, so here will be an online. 85 00:05:48,040 --> 00:05:49,780 So there this is the same. 86 00:05:51,720 --> 00:05:57,950 Now, you can also change the venue, for example, I equals 23. 87 00:05:58,800 --> 00:06:00,570 So if you will bring the value of I 88 00:06:03,870 --> 00:06:06,690 ordered will be 23, the value of you has been changed. 89 00:06:09,030 --> 00:06:13,240 Certain degree, you can also change the way you're fighting with the help of pointer. 90 00:06:14,130 --> 00:06:16,800 So did a fence be it was 32. 91 00:06:17,730 --> 00:06:20,190 And now let us spend the value of AI again. 92 00:06:21,210 --> 00:06:23,700 So now the value of AI is 32. 93 00:06:26,590 --> 00:06:28,480 So the value of AI is hard to do. 94 00:06:29,150 --> 00:06:30,610 Now let's see how it happens. 95 00:06:35,420 --> 00:06:37,310 So we have to focus on these lines. 96 00:06:37,820 --> 00:06:44,660 OK, so I equal day three and Defense B equals 32. 97 00:06:45,730 --> 00:06:49,300 So first of all, what I will do, I will search in the symbol table. 98 00:06:49,530 --> 00:06:54,140 So there is a variable I and the variable I has got to memory this of 700. 99 00:06:55,170 --> 00:06:59,930 So this is memory at this seven hundred and the value is initially ten. 100 00:07:01,210 --> 00:07:09,700 So I will go to this memory this and I will change its value to 23 and here twenty three will be printed. 101 00:07:11,200 --> 00:07:13,000 Now let us focus on this line. 102 00:07:13,990 --> 00:07:15,940 So what will happen first of all? 103 00:07:15,970 --> 00:07:18,430 I will go into Simbel Table and search for P. 104 00:07:18,520 --> 00:07:18,940 Yes. 105 00:07:19,030 --> 00:07:19,670 There is a point. 106 00:07:19,680 --> 00:07:22,360 Turpie Its memory at this is 800. 107 00:07:23,290 --> 00:07:25,240 So what I will do, I will. 108 00:07:26,260 --> 00:07:28,640 So this is a pointer letters. 109 00:07:28,860 --> 00:07:30,580 This is 800. 110 00:07:30,640 --> 00:07:32,500 And the value stored is 700. 111 00:07:32,920 --> 00:07:35,840 So I will reach here since it's dear friends. 112 00:07:36,130 --> 00:07:36,940 So what I will do. 113 00:07:37,480 --> 00:07:40,180 This is pointing towards this remote location. 114 00:07:40,480 --> 00:07:41,350 So I will come here. 115 00:07:43,020 --> 00:07:47,880 And I will change its value to try to do so at this line. 116 00:07:48,970 --> 00:07:49,940 32 different. 117 00:07:51,870 --> 00:07:52,150 OK. 118 00:07:57,530 --> 00:08:01,420 So what I want to say is we have to raise. 119 00:08:02,700 --> 00:08:03,480 To access. 120 00:08:05,470 --> 00:08:06,610 Team memory. 121 00:08:10,980 --> 00:08:13,560 We have two ways to access the same memory. 122 00:08:13,830 --> 00:08:16,470 First is with the help of variable eye. 123 00:08:17,010 --> 00:08:24,960 And second, with the help of point therapy, basically the offense be so I question D3 star be equipped 124 00:08:25,010 --> 00:08:25,580 to do, too. 125 00:08:26,040 --> 00:08:32,370 They both have the same eye and Dabi, they both had same, if you will, change any of them. 126 00:08:32,670 --> 00:08:35,490 That will change the visual inflected input. 127 00:08:36,850 --> 00:08:42,000 OK, so we have two ways to access the same memory. 128 00:08:42,210 --> 00:08:44,460 First, with the help of Variable I. 129 00:08:46,160 --> 00:08:49,070 And second, with the help of Pointer B.. 130 00:08:50,200 --> 00:08:53,200 Both are pointing towards the same memory location. 131 00:08:54,290 --> 00:08:56,290 OK, so now let's see. 132 00:08:57,230 --> 00:08:59,750 Some predict the output equation. 133 00:09:00,350 --> 00:09:01,150 So this is a. 134 00:09:02,330 --> 00:09:03,920 We have to predict its output. 135 00:09:04,340 --> 00:09:05,570 So we can take our time. 136 00:09:06,110 --> 00:09:07,790 You can post a video if you want to. 137 00:09:08,440 --> 00:09:10,670 So now let's see what will be our output. 138 00:09:13,760 --> 00:09:14,300 So. 139 00:09:18,030 --> 00:09:22,680 This is a the value is seven and let's say the memory addresses 700. 140 00:09:24,370 --> 00:09:24,590 OK. 141 00:09:24,690 --> 00:09:30,750 So I have B. Ray Lewis, 17, and let's say the memory addresses 800. 142 00:09:31,620 --> 00:09:37,390 I make a pointer which is storing their does B, so I have a point. 143 00:09:37,410 --> 00:09:41,120 I see it distorting the address of B. 144 00:09:41,400 --> 00:09:43,860 And let's say it's our business 800. 145 00:09:44,670 --> 00:09:47,390 So, dear friends, C, quiz seven. 146 00:09:47,430 --> 00:09:48,210 So go ahead. 147 00:09:49,020 --> 00:09:49,830 Make it seven. 148 00:09:52,200 --> 00:09:54,140 I'll see you out A and B.. 149 00:09:54,450 --> 00:09:56,520 So A seven B is seven. 150 00:09:56,820 --> 00:09:58,290 So seven and seven. 151 00:09:58,410 --> 00:09:59,280 This is Malverde. 152 00:10:00,810 --> 00:10:02,220 So seven and seven. 153 00:10:02,940 --> 00:10:05,110 Now C is containing the Sophie. 154 00:10:05,520 --> 00:10:09,000 So C is containing the address of A. 155 00:10:10,350 --> 00:10:17,790 Now, go to that memory location, did a fancy go to that memory location and change its value to 17. 156 00:10:17,840 --> 00:10:19,340 So nowadays, 17. 157 00:10:20,470 --> 00:10:25,300 To be out and then be so is 17, B is seven. 158 00:10:25,900 --> 00:10:27,250 So this should be my output. 159 00:10:27,550 --> 00:10:29,650 Seven seven, 17, seven. 160 00:10:30,760 --> 00:10:31,750 OK, so let's see. 161 00:10:38,190 --> 00:10:40,440 So seven seven seven deden seven. 162 00:10:40,840 --> 00:10:42,730 So our prediction is hundred percent correct. 163 00:10:43,470 --> 00:10:44,710 Now let's see when McCuistion. 164 00:10:47,900 --> 00:10:49,250 So this is our question. 165 00:10:50,270 --> 00:10:52,070 If you want to take some time, you can take. 166 00:10:52,970 --> 00:10:54,050 You can post the video. 167 00:10:54,440 --> 00:10:56,270 So let's see the solution. 168 00:10:58,040 --> 00:10:58,260 OK. 169 00:10:58,310 --> 00:10:58,880 So. 170 00:11:01,220 --> 00:11:06,840 I have a variable, a very loose 50, and let's say it's Airbus's 700. 171 00:11:08,060 --> 00:11:12,100 Now I have a point that BTR, so I have a pointer. 172 00:11:13,100 --> 00:11:14,690 Its name is BTR. 173 00:11:15,170 --> 00:11:17,120 And Distorting the air does Sophie. 174 00:11:17,360 --> 00:11:18,950 That is seven 700. 175 00:11:20,660 --> 00:11:22,360 Now, I have again appointed you. 176 00:11:22,550 --> 00:11:23,900 So I have a point. 177 00:11:24,010 --> 00:11:28,070 Q Let's say the memory does of PDR is 800. 178 00:11:29,500 --> 00:11:30,370 So I have a point. 179 00:11:30,520 --> 00:11:34,580 Q It's value copy the value of BTR. 180 00:11:35,140 --> 00:11:38,410 So it is 700 starky plus plus. 181 00:11:38,740 --> 00:11:41,800 So basically dereference so go to that memory location. 182 00:11:42,820 --> 00:11:43,780 I have reached here. 183 00:11:44,090 --> 00:11:45,660 Stargell means 50. 184 00:11:45,930 --> 00:11:47,140 So 50 plus plus. 185 00:11:47,200 --> 00:11:51,060 So it will become 51 C out a. 186 00:11:51,790 --> 00:11:52,720 So 51. 187 00:11:53,740 --> 00:11:58,730 And percent of P.D.A 800, their best of breed, are at this off. 188 00:11:58,760 --> 00:12:01,450 Q So let's to their dose of QE is nine hundred. 189 00:12:01,970 --> 00:12:03,510 So output will be nine hundred. 190 00:12:03,920 --> 00:12:05,120 So this will be output. 191 00:12:06,590 --> 00:12:07,930 These two are no loose. 192 00:12:10,470 --> 00:12:16,320 OK, so one common thing that many people confuse here is this line line embedded. 193 00:12:20,010 --> 00:12:21,840 And Star Q equals. 194 00:12:22,770 --> 00:12:24,930 So many people will get confusion here. 195 00:12:25,500 --> 00:12:25,920 So. 196 00:12:27,060 --> 00:12:29,630 When I write and equals me. 197 00:12:29,850 --> 00:12:30,690 So what will happen? 198 00:12:30,930 --> 00:12:33,170 The value of B will be copied into A. 199 00:12:33,720 --> 00:12:38,790 So if and B question and B questions, the value of A will also become. 200 00:12:38,890 --> 00:12:41,580 Then basically copy the value of being to a. 201 00:12:41,790 --> 00:12:44,850 Because both are of type integer here. 202 00:12:45,180 --> 00:12:46,080 Both are of type. 203 00:12:47,460 --> 00:12:56,940 And star, BTR, a quiz and person off a show here copy the valley of BTR in to kill because both are 204 00:12:56,940 --> 00:12:58,080 of type in star. 205 00:12:58,740 --> 00:12:59,590 So that's why I go. 206 00:12:59,630 --> 00:13:01,500 But that's why I copied the value. 207 00:13:01,560 --> 00:13:02,550 So I went in there and took. 208 00:13:02,580 --> 00:13:05,280 Q OK, so this is my output. 209 00:13:06,750 --> 00:13:08,180 Fifty one and two. 210 00:13:08,280 --> 00:13:08,940 No lose. 211 00:13:09,930 --> 00:13:10,560 So let's see. 212 00:13:16,410 --> 00:13:20,580 So 51 and do it, and I may lose two eggs or decimal numbers. 213 00:13:21,550 --> 00:13:21,810 OK. 214 00:13:23,720 --> 00:13:24,420 If you will. 215 00:13:24,970 --> 00:13:25,440 Brian. 216 00:13:25,540 --> 00:13:28,670 Brenda Veli of Dead and Guillard output will be same. 217 00:13:29,040 --> 00:13:29,860 They will lose seem. 218 00:13:30,170 --> 00:13:32,090 They brought us doing their dose of a. 219 00:13:34,050 --> 00:13:38,440 So we'll see you out there, Sophie. 220 00:13:41,150 --> 00:13:42,530 Now, all these tea lines. 221 00:13:43,730 --> 00:13:46,220 Well, today, N14 will have the same output. 222 00:13:46,660 --> 00:13:48,250 That is the address of a. 223 00:13:52,670 --> 00:13:54,910 You can see here the address of a. 224 00:13:55,640 --> 00:13:56,450 So now. 225 00:14:01,370 --> 00:14:04,770 So here we have three ways here. 226 00:14:05,210 --> 00:14:09,380 We have three ways to access the same memory. 227 00:14:10,220 --> 00:14:12,830 Three ways to access the same memory. 228 00:14:13,040 --> 00:14:18,530 First, with the help of variably equals 10 seconds with the help of variable PDA. 229 00:14:18,620 --> 00:14:22,920 So any PDA equals twenty powered with the help of another point. 230 00:14:23,060 --> 00:14:24,140 Q So. 231 00:14:24,180 --> 00:14:25,670 And you start. 232 00:14:25,850 --> 00:14:27,100 Q was 30. 233 00:14:27,500 --> 00:14:30,130 So if add this line, you reprint the value of it. 234 00:14:30,190 --> 00:14:33,230 So the output will be 30. 235 00:14:33,920 --> 00:14:34,200 OK. 236 00:14:34,430 --> 00:14:38,660 So in this question, we now have three ways to access the same memory. 237 00:14:38,930 --> 00:14:39,890 So this is a. 238 00:14:41,870 --> 00:14:48,110 Pointer BTR is pointing towards this and Pointer Gill is also pointing towards this memory location. 239 00:14:48,620 --> 00:14:48,930 OK. 240 00:14:49,430 --> 00:14:50,930 So let us even more question. 241 00:14:53,230 --> 00:14:55,790 So we have to predict its output. 242 00:14:56,380 --> 00:15:00,370 Again, you can again you can post the video if you want to take some time. 243 00:15:00,900 --> 00:15:02,140 Now let's see the solution. 244 00:15:05,190 --> 00:15:06,750 So end equals 50. 245 00:15:06,840 --> 00:15:07,150 OK. 246 00:15:08,010 --> 00:15:11,750 This is a this is 50 and let's say it addresses seven and. 247 00:15:12,790 --> 00:15:18,580 OK, so make a point that P.D.A, this point, WDR, is pointing towards this. 248 00:15:19,600 --> 00:15:26,710 And so this is BTR site seven hundred and let's say it's memory vs. 800. 249 00:15:28,210 --> 00:15:31,140 Did a fence be so good to go here? 250 00:15:32,870 --> 00:15:38,000 S plus, increase the value, it will become 51 C out A. 251 00:15:38,430 --> 00:15:42,100 So if you will see our day after will be 51. 252 00:15:42,750 --> 00:15:47,430 But headline number eight, Malverde will be 50 because it is post increment. 253 00:15:47,970 --> 00:15:56,280 So in Naples, 50 C out A plus plus and C out A. 254 00:15:56,790 --> 00:15:59,850 So at this line my output will be 50. 255 00:15:59,970 --> 00:16:03,810 But at this lane my output will be 51 because this is post increment. 256 00:16:04,650 --> 00:16:05,850 This is post increment. 257 00:16:06,180 --> 00:16:07,950 And same is happening here. 258 00:16:08,370 --> 00:16:11,610 Start with the edit is actually nothing but a only. 259 00:16:13,080 --> 00:16:15,840 Okay, so I will go towards this memory location. 260 00:16:15,900 --> 00:16:21,450 I will increase its value, but before increasing its value, I will print C out BTR. 261 00:16:22,530 --> 00:16:28,380 This line, this statement will be executed first and then the value of it will be incremented. 262 00:16:28,670 --> 00:16:31,770 So now output will be 50 and 51. 263 00:16:34,250 --> 00:16:35,350 Fifty and fifty one. 264 00:16:38,030 --> 00:16:39,930 So let's give in lane here. 265 00:16:46,370 --> 00:16:48,200 So 50 and 51. 266 00:16:48,810 --> 00:16:49,050 OK. 267 00:16:50,370 --> 00:16:54,390 So now let us discuss the last topic of today's class. 268 00:16:59,810 --> 00:17:03,880 So try to focus on the right to focus on this line. 269 00:17:04,340 --> 00:17:08,180 Never did a fence and he got a big address. 270 00:17:08,780 --> 00:17:11,810 So we will always initialize our point or do not. 271 00:17:12,710 --> 00:17:13,970 So this is a very big line. 272 00:17:14,060 --> 00:17:16,280 Let's try to understand what is the meaning of this line. 273 00:17:17,180 --> 00:17:19,880 Okay, so tell me what will happen if I do. 274 00:17:21,500 --> 00:17:22,160 Entergy. 275 00:17:23,920 --> 00:17:29,950 See, algae, Waterloo output, some output will be a guy Habichuela. 276 00:17:30,570 --> 00:17:31,550 I've got a vision, Deja. 277 00:17:34,150 --> 00:17:34,420 OK. 278 00:17:34,950 --> 00:17:42,420 So now tell me what will happen if I try and do and start B? 279 00:17:45,280 --> 00:17:46,070 See, outby. 280 00:17:46,790 --> 00:17:47,600 So what will happen? 281 00:17:48,470 --> 00:17:50,120 I've got a major will we entered. 282 00:17:51,670 --> 00:17:55,320 I've got a bit this will be printed. 283 00:17:55,700 --> 00:17:57,140 OK, no doubt below. 284 00:17:58,560 --> 00:17:59,850 Now, what will happen? 285 00:18:00,920 --> 00:18:06,230 If I do build a fence, be it was, let's say, 50. 286 00:18:07,440 --> 00:18:08,400 So what will happen? 287 00:18:08,970 --> 00:18:14,250 And in the next lane, fired prior to print, the value of B, B defense. 288 00:18:14,280 --> 00:18:14,520 B. 289 00:18:16,440 --> 00:18:17,340 So what will happen? 290 00:18:19,470 --> 00:18:19,920 Let's see. 291 00:18:20,310 --> 00:18:21,150 So venue. 292 00:18:21,260 --> 00:18:22,070 Dude, venue. 293 00:18:22,080 --> 00:18:22,360 All right. 294 00:18:22,410 --> 00:18:23,490 This line, what will happen? 295 00:18:24,180 --> 00:18:27,900 This is a point B and distorting a garbage at this. 296 00:18:29,510 --> 00:18:30,920 No outline, no, this. 297 00:18:31,510 --> 00:18:32,630 What I am trying to do. 298 00:18:33,110 --> 00:18:34,910 Go through that garbage address. 299 00:18:35,820 --> 00:18:36,830 Go to the garbage. 300 00:18:36,890 --> 00:18:40,640 This dead garbage memory location and write 50 dear. 301 00:18:41,880 --> 00:18:42,140 OK. 302 00:18:42,460 --> 00:18:48,990 This is very scary for entropy is containing a garbage address. 303 00:18:50,170 --> 00:18:56,170 And what we are trying to do at this line go to get the garbage address and relative to the. 304 00:18:57,120 --> 00:18:58,470 But this is very scary. 305 00:18:58,840 --> 00:19:01,910 This memory, this address doesn't belong to us. 306 00:19:03,890 --> 00:19:06,050 This might be a protected memory. 307 00:19:08,990 --> 00:19:10,220 This might be Rome. 308 00:19:11,710 --> 00:19:12,950 So what I'm trying to do. 309 00:19:13,280 --> 00:19:14,960 Go to that garbage location. 310 00:19:15,080 --> 00:19:17,620 Go to the garbage address and drive 50 there. 311 00:19:19,040 --> 00:19:20,450 So this is very, very scary. 312 00:19:20,950 --> 00:19:22,040 You should not do it. 313 00:19:22,160 --> 00:19:23,130 We should never do it. 314 00:19:24,240 --> 00:19:24,460 OK. 315 00:19:25,460 --> 00:19:32,210 So what we will do, so we will always we will always initialise. 316 00:19:32,660 --> 00:19:36,200 We will always initialize our point or do none. 317 00:19:40,050 --> 00:19:48,260 So then I will create my pointer in Star P and the next line if I want to do this. 318 00:19:49,290 --> 00:19:51,180 So we should never do this. 319 00:19:52,080 --> 00:19:53,170 I've explained before. 320 00:19:53,730 --> 00:19:54,580 So what do we do? 321 00:19:55,580 --> 00:19:59,960 As soon as you create the pointer, either give it some ideas. 322 00:20:00,950 --> 00:20:07,790 So option number one, they're given some address and option number two is if you don't know what is 323 00:20:07,790 --> 00:20:09,170 their district desperately want to give. 324 00:20:10,150 --> 00:20:11,600 To initialise it with an. 325 00:20:13,100 --> 00:20:20,540 So meaning of this line is there is a point or B and this point B is pointing towards nothing. 326 00:20:21,470 --> 00:20:23,550 This point is pointing towards nothing. 327 00:20:23,930 --> 00:20:25,280 So if in the next lane. 328 00:20:26,780 --> 00:20:27,770 They will do this. 329 00:20:28,370 --> 00:20:29,210 It will give us added. 330 00:20:30,320 --> 00:20:32,420 It will give us at it our system will crash. 331 00:20:33,560 --> 00:20:35,150 Basically, what is the meaning of this line? 332 00:20:36,500 --> 00:20:39,110 Go to hell and write 50, dear. 333 00:20:39,980 --> 00:20:40,790 Very strange. 334 00:20:41,150 --> 00:20:43,460 So this will give us at it. 335 00:20:43,610 --> 00:20:45,110 And our system will crash. 336 00:20:45,650 --> 00:20:47,540 And I want our system to crash. 337 00:20:47,570 --> 00:20:49,050 We want our system to crash. 338 00:20:49,100 --> 00:20:51,560 Because I am doing a very stupid thing. 339 00:20:52,430 --> 00:20:59,260 If I do some stupidity, then I must get out of a crash. 340 00:20:59,340 --> 00:21:02,500 Must appear segmentation fault must be dear. 341 00:21:03,480 --> 00:21:03,750 OK. 342 00:21:04,130 --> 00:21:07,210 So that is the reason we will always initialize our Lapoint of. 343 00:21:08,800 --> 00:21:09,070 Okay. 344 00:21:09,350 --> 00:21:12,470 So if you will not initialize our pointer with what will happen. 345 00:21:13,400 --> 00:21:16,380 So here I was not initializing my point provisional. 346 00:21:17,750 --> 00:21:18,950 So anything can happen. 347 00:21:19,420 --> 00:21:19,690 Okay. 348 00:21:20,030 --> 00:21:25,190 So but if I really initialize my point of it then I will get an error. 349 00:21:25,970 --> 00:21:26,810 I will get an error. 350 00:21:26,840 --> 00:21:28,010 Our system will crash. 351 00:21:28,490 --> 00:21:30,020 Then I will come to understand. 352 00:21:30,230 --> 00:21:32,450 All I did some stupidity. 353 00:21:33,560 --> 00:21:33,750 OK. 354 00:21:34,360 --> 00:21:35,560 So let's write code. 355 00:21:49,160 --> 00:21:55,490 So suppose Entergy see LG, what will happen? 356 00:21:55,580 --> 00:21:57,560 I've got a bagian deja will get printed 357 00:22:01,100 --> 00:22:06,350 and Appointer, which is containing garbagey orders if you will print. 358 00:22:06,450 --> 00:22:07,790 B, what will happen? 359 00:22:08,360 --> 00:22:09,000 I've got a major. 360 00:22:09,020 --> 00:22:10,220 This will get printed. 361 00:22:11,030 --> 00:22:11,300 OK. 362 00:22:12,080 --> 00:22:12,830 So let's see. 363 00:22:16,440 --> 00:22:20,130 So random garbage in danger and a garbage at this. 364 00:22:21,580 --> 00:22:26,190 So what I told you, we will always initialize our pointer with null. 365 00:22:26,760 --> 00:22:28,630 So initialize our point provisionally. 366 00:22:30,340 --> 00:22:37,760 Now, if in the next line I will if I will change the value of being if I am the referencing B. 367 00:22:38,500 --> 00:22:39,820 Our system will crash. 368 00:22:39,910 --> 00:22:41,410 There will be segmentation void. 369 00:22:47,320 --> 00:22:52,300 Sally's system got crashed and something and it has caught appeared beard. 370 00:22:53,250 --> 00:22:56,440 OK, so this is this segmentation for Dinamo Gold. 371 00:22:56,740 --> 00:22:59,680 OK, so I hope now you know the meaning of this line. 372 00:23:00,790 --> 00:23:04,080 Never did a fence and a garbage address. 373 00:23:04,660 --> 00:23:08,620 So always initialize your pointer to null. 374 00:23:11,130 --> 00:23:13,720 OK, so this is it for this video. 375 00:23:13,780 --> 00:23:15,550 If you have any doubt, feel free to ask. 376 00:23:15,610 --> 00:23:16,120 Thank you.