1 00:00:01,980 --> 00:00:03,480 Hey, guys, what's up? 2 00:00:03,930 --> 00:00:10,610 So today we are going to study a new topic called Scope of Lady of. 3 00:00:16,720 --> 00:00:20,290 So, for example, if my code is in DeMain. 4 00:00:23,840 --> 00:00:26,640 Suppose I have a variable and I. 5 00:00:27,450 --> 00:00:29,380 And suppose I have a for loop. 6 00:00:32,710 --> 00:00:39,040 And I'm doing some work here, and for example, if I create a variable G inside the for loop. 7 00:00:40,990 --> 00:00:41,210 OK. 8 00:00:41,310 --> 00:00:46,120 And then I am printing the value of G outside the for loop. 9 00:00:47,050 --> 00:00:48,640 So my question is. 10 00:00:49,990 --> 00:00:51,180 Is this correct? 11 00:00:52,720 --> 00:00:54,960 So is this code correct or not? 12 00:00:57,160 --> 00:00:58,690 So what is happening here? 13 00:00:59,170 --> 00:01:06,170 You declared the variable G inside the for loop and you are trying to access the G outside the for loop. 14 00:01:06,690 --> 00:01:08,230 So Compiler will give us added. 15 00:01:10,220 --> 00:01:18,140 And what error compiler will give compiler will say, I don't know, Compiler will say, I don't know 16 00:01:18,140 --> 00:01:18,650 what DG. 17 00:01:19,970 --> 00:01:22,710 I don't know where this G. 18 00:01:23,670 --> 00:01:23,960 Why? 19 00:01:24,380 --> 00:01:30,970 Because the existence of G is between these brackets, these curly brackets. 20 00:01:32,370 --> 00:01:32,630 OK. 21 00:01:32,970 --> 00:01:36,040 You have declared a variable J inside the for loop. 22 00:01:36,990 --> 00:01:43,870 And since this J is declared inside the for loop, so its existence is between these calibrate codes. 23 00:01:43,890 --> 00:01:51,510 Only if you are trying to access if you will try to access this J outside this Becket's then compiler 24 00:01:51,510 --> 00:01:55,320 will say, hey, I don't know what this G. 25 00:01:56,530 --> 00:01:56,780 OK. 26 00:01:57,360 --> 00:02:04,390 So if someone ask you what is scope of G, so what is the scope of variable G? 27 00:02:04,680 --> 00:02:05,530 So the scope of J. 28 00:02:05,640 --> 00:02:08,130 Is between these curly brackets. 29 00:02:09,920 --> 00:02:11,300 Outside these Carlebach kids. 30 00:02:12,360 --> 00:02:14,160 Compiler don't know where d.g. 31 00:02:15,090 --> 00:02:15,430 OK. 32 00:02:17,190 --> 00:02:17,970 Now, let's see. 33 00:02:19,600 --> 00:02:22,800 Okay, so let us write some code to get a better understanding. 34 00:02:27,040 --> 00:02:31,180 So let's name it Scope Nazi, BP. 35 00:02:46,110 --> 00:02:50,370 So I will show you some exciting things. 36 00:02:51,180 --> 00:02:54,310 Suppose I have a variable index equals 10. 37 00:02:55,740 --> 00:02:56,040 OK. 38 00:02:56,460 --> 00:03:02,220 Now if you will create the same variable and X, then compiler will show you edit. 39 00:03:02,730 --> 00:03:03,240 Let's see. 40 00:03:06,210 --> 00:03:13,650 So the compiler is showing us error and error is that you can't have two variables with the same name. 41 00:03:15,450 --> 00:03:17,100 So X equals 10. 42 00:03:17,700 --> 00:03:20,720 And you are again making a variable and X. 43 00:03:21,000 --> 00:03:25,680 So compiler will say, hey, buddy, you can't have two variables with the same name. 44 00:03:27,060 --> 00:03:28,110 But let me show you. 45 00:03:30,300 --> 00:03:31,440 Some interesting things. 46 00:03:31,500 --> 00:03:41,140 So what I will do for and I equals zero I less than two five. 47 00:03:41,520 --> 00:03:42,680 I bless, bless. 48 00:03:44,100 --> 00:03:48,570 And let's see here I am making a variable again with the same name X. 49 00:03:49,830 --> 00:03:51,320 Let's say your index equals I. 50 00:03:52,440 --> 00:03:55,920 And then I am printing the value of X. 51 00:03:58,720 --> 00:03:59,260 And Len. 52 00:04:02,250 --> 00:04:02,510 OK. 53 00:04:04,340 --> 00:04:07,700 So what do you think Combiner will show us at it or not? 54 00:04:09,340 --> 00:04:10,820 OK, let's do one more thing. 55 00:04:11,540 --> 00:04:15,260 Let us spend the value of X, also see outtakes. 56 00:04:16,220 --> 00:04:18,230 Let's see what will be our output. 57 00:04:18,830 --> 00:04:24,290 So my first question is whether compiler will show us error at line number 10 because we are creating 58 00:04:24,290 --> 00:04:25,120 a variable X. 59 00:04:25,790 --> 00:04:27,800 And the name already exists. 60 00:04:27,980 --> 00:04:32,120 We are already having the same variable variable with the same name. 61 00:04:33,670 --> 00:04:34,330 So let's see. 62 00:04:38,400 --> 00:04:40,930 No, the compiler is not giving us added way. 63 00:04:42,210 --> 00:04:46,590 Let's try to understand why the compiler is not giving this error in the previous case. 64 00:04:47,780 --> 00:04:49,020 Kambala showed us at a. 65 00:04:51,020 --> 00:04:52,430 So just try to focus. 66 00:04:52,850 --> 00:04:58,870 What was the last case in Texaco's 10 and thanks so come by, Lessie. 67 00:04:59,570 --> 00:05:02,030 Hey, you can't have two variables with the same name. 68 00:05:02,150 --> 00:05:07,610 I say, OK, now here I am again, having variables with the same name. 69 00:05:07,790 --> 00:05:12,890 Then Weida come by Lisen or jingoes error because they have different scope. 70 00:05:13,640 --> 00:05:22,610 The scope of this variable is between this Blackard and this Blackard, whereas the scope of this variable 71 00:05:22,640 --> 00:05:26,030 X is between this Blackard and this Blackard. 72 00:05:27,600 --> 00:05:30,080 OK, so the main reason is different. 73 00:05:30,140 --> 00:05:30,650 Schoop. 74 00:05:32,910 --> 00:05:35,740 They're too variable, X has different scope. 75 00:05:37,060 --> 00:05:40,330 OK, so these two variables X are different. 76 00:05:40,720 --> 00:05:45,040 And the main reason is because of the different scope. 77 00:05:48,470 --> 00:05:50,120 OK, so this variable. 78 00:05:51,530 --> 00:05:52,610 Let me clear all this. 79 00:05:57,990 --> 00:06:00,100 So this variable X is different. 80 00:06:03,110 --> 00:06:05,060 This variable X is different. 81 00:06:07,000 --> 00:06:07,960 And what is the reason? 82 00:06:08,230 --> 00:06:09,760 Because they have different scope. 83 00:06:13,630 --> 00:06:18,250 The last example was and X equals 10 and X. 84 00:06:18,670 --> 00:06:21,940 They both were not different because their scope was him. 85 00:06:22,890 --> 00:06:23,200 OK. 86 00:06:23,680 --> 00:06:25,210 Their scope was same. 87 00:06:25,240 --> 00:06:26,230 So come by level. 88 00:06:26,560 --> 00:06:27,340 Show us at it. 89 00:06:27,670 --> 00:06:29,500 But here, their scope are different. 90 00:06:29,590 --> 00:06:32,020 So they will be treated as different variables. 91 00:06:33,720 --> 00:06:33,960 OK. 92 00:06:34,060 --> 00:06:36,550 So they will be treated as different variables. 93 00:06:39,480 --> 00:06:41,700 One more thing that I want to tell you is. 94 00:06:43,870 --> 00:06:44,860 Let's see the output. 95 00:06:45,130 --> 00:06:46,000 Where does my output? 96 00:06:49,710 --> 00:06:51,600 So now I put this coming out with this. 97 00:06:51,720 --> 00:06:53,160 Now let's see how it comes. 98 00:06:59,800 --> 00:07:02,390 So first of all, I told you, this is different takes. 99 00:07:02,860 --> 00:07:10,060 So what I'm doing are variable, I is varying from zero to five and the value of I assigned to X and 100 00:07:10,060 --> 00:07:11,320 then I am printing X. 101 00:07:11,770 --> 00:07:14,470 So zero to four is expected. 102 00:07:16,140 --> 00:07:16,850 Zero to four. 103 00:07:18,170 --> 00:07:19,040 Will remain output. 104 00:07:19,400 --> 00:07:20,660 This is the output of loop. 105 00:07:21,390 --> 00:07:21,570 OK. 106 00:07:21,650 --> 00:07:23,770 So what is the output of loop output of Lopez? 107 00:07:23,840 --> 00:07:24,380 Zero. 108 00:07:24,500 --> 00:07:26,540 One, two, three and four. 109 00:07:27,470 --> 00:07:29,300 Now, focus on line number 14. 110 00:07:31,040 --> 00:07:33,050 So the value of X is ten. 111 00:07:33,770 --> 00:07:38,080 If we treat this X and the value of X is four. 112 00:07:38,510 --> 00:07:44,720 If I treat this X, so vich values getting printed, then why not four? 113 00:07:45,590 --> 00:07:50,960 Because this variable X doesn't exist after these Beckert. 114 00:07:52,510 --> 00:07:55,900 OK, so this X is this X? 115 00:07:59,120 --> 00:07:59,440 OK. 116 00:08:00,570 --> 00:08:01,650 Just one more time. 117 00:08:06,710 --> 00:08:10,700 First thing first, the sex and the sex are different. 118 00:08:11,520 --> 00:08:11,830 OK? 119 00:08:12,290 --> 00:08:14,840 What is the output of the loop, aka the loop is zero. 120 00:08:14,840 --> 00:08:16,130 One, two, three and four. 121 00:08:16,800 --> 00:08:18,740 Now, with each line number 14. 122 00:08:19,100 --> 00:08:20,000 So red line number four. 123 00:08:20,050 --> 00:08:20,170 Ding! 124 00:08:20,240 --> 00:08:21,740 I am bringing the value of X. 125 00:08:22,470 --> 00:08:25,640 OK, so which X is this. 126 00:08:25,760 --> 00:08:27,140 This one or this one. 127 00:08:27,440 --> 00:08:34,250 So obviously this one to be Y because this X exists only between this and this. 128 00:08:35,690 --> 00:08:39,560 So obviously this X is this one. 129 00:08:40,070 --> 00:08:40,830 Now what div. 130 00:08:44,660 --> 00:08:47,060 Now, what if I remove and from here? 131 00:08:49,810 --> 00:08:52,900 What will happen to this is normal conditions. 132 00:08:53,770 --> 00:08:54,220 Let's see. 133 00:08:57,590 --> 00:08:59,750 So I would argue this is zero, one, two, three, four. 134 00:08:59,780 --> 00:09:02,890 And again, four in the last example, it was 10. 135 00:09:03,860 --> 00:09:04,200 OK. 136 00:09:04,520 --> 00:09:05,810 Now let's see what is happening here. 137 00:09:09,500 --> 00:09:11,570 So there is no confusion in this. 138 00:09:12,110 --> 00:09:13,490 So there is no confusion. 139 00:09:14,060 --> 00:09:14,390 Why? 140 00:09:14,630 --> 00:09:17,200 Because there is only one X and Y. 141 00:09:17,300 --> 00:09:19,160 Can I use this X between this X? 142 00:09:19,430 --> 00:09:26,400 Because the scope of this X is between this and this and full loop comes between this and this. 143 00:09:27,080 --> 00:09:33,020 OK, so I can use X inside the loop so X equals I and bring the value of X so zero. 144 00:09:33,020 --> 00:09:33,770 One, two, three, four. 145 00:09:34,950 --> 00:09:37,250 Of this, now I am bringing eggs. 146 00:09:37,690 --> 00:09:38,500 So this eggs. 147 00:09:39,720 --> 00:09:40,520 Should be good, Brender. 148 00:09:40,710 --> 00:09:42,840 But this X and this X is same. 149 00:09:43,110 --> 00:09:46,620 If I am changing the value of X, this X value will also change. 150 00:09:46,650 --> 00:09:47,690 Basically the same. 151 00:09:48,970 --> 00:09:50,040 They are same. 152 00:09:50,670 --> 00:09:53,130 So since they are saying my output will be for. 153 00:09:54,150 --> 00:09:55,890 Because the law desperately affects this food. 154 00:09:56,400 --> 00:09:56,940 One more time. 155 00:10:03,820 --> 00:10:06,910 And this woman, this ex and this ex Assim. 156 00:10:08,430 --> 00:10:08,700 OK. 157 00:10:09,220 --> 00:10:10,660 I am changing the value of X. 158 00:10:10,690 --> 00:10:11,460 X equals I. 159 00:10:12,130 --> 00:10:14,260 So this value will be changed. 160 00:10:15,350 --> 00:10:20,150 And finally, the updated value, which is full, will get printed. 161 00:10:23,170 --> 00:10:24,850 OK, now one more thing. 162 00:10:28,000 --> 00:10:32,880 What will happen if I try and print you out? 163 00:10:33,830 --> 00:10:34,680 Let's say I. 164 00:10:38,780 --> 00:10:50,180 So I think Compiler will show us a way, because this eye is a part of for loop and hence the scope 165 00:10:50,180 --> 00:10:54,620 of variable eye is between this Blackard and this record. 166 00:10:55,280 --> 00:10:58,400 And I am using it outside the for loop. 167 00:10:58,870 --> 00:11:00,760 So Compiler should source it. 168 00:11:01,520 --> 00:11:02,750 And I should all cut. 169 00:11:05,430 --> 00:11:05,630 OK. 170 00:11:05,870 --> 00:11:06,590 So there it is. 171 00:11:07,580 --> 00:11:10,130 That is very simple, Combiner don't know what is a. 172 00:11:12,280 --> 00:11:16,240 OK, now let's see some more interesting things. 173 00:11:19,220 --> 00:11:21,800 So you have to tell me what will be my output? 174 00:11:22,370 --> 00:11:23,480 So InterMune. 175 00:11:27,560 --> 00:11:32,360 And it's suppose now there's a for loop. 176 00:11:35,830 --> 00:11:41,430 There's something written, and now I'm printing the value of X. 177 00:11:42,670 --> 00:11:44,140 So what will be my output? 178 00:11:46,400 --> 00:11:46,650 OK. 179 00:11:46,750 --> 00:11:48,910 So tell me where to live, my output. 180 00:11:50,170 --> 00:11:51,520 So the answer is very simple. 181 00:11:51,880 --> 00:11:53,440 Output will be a Garveys value. 182 00:11:54,340 --> 00:11:55,370 Sodrel will be at that rate. 183 00:11:55,470 --> 00:11:57,480 When do I have not given X anyway, Lou? 184 00:11:57,850 --> 00:12:01,000 So when you will train for index, you will get a Gadsby's value. 185 00:12:01,450 --> 00:12:03,730 This question is not at all related to scope. 186 00:12:04,720 --> 00:12:07,270 I just give this cushion to open your mind. 187 00:12:08,200 --> 00:12:08,410 OK. 188 00:12:08,710 --> 00:12:11,200 So what value output are garbage value. 189 00:12:12,740 --> 00:12:16,210 Now you have to tell me if I try and print. 190 00:12:17,320 --> 00:12:17,890 Let's say. 191 00:12:19,050 --> 00:12:19,750 And I mean. 192 00:12:24,790 --> 00:12:33,310 And eye for and eye equals zero, eye less than, let's say, five. 193 00:12:33,980 --> 00:12:34,900 I bless, bless. 194 00:12:35,700 --> 00:12:40,330 I am doing some work here and now I am finding the value of a. 195 00:12:41,500 --> 00:12:43,000 So widely we might output. 196 00:12:45,630 --> 00:12:51,810 So you have to tell me whether there will be another compilation error will occur or otherwise. 197 00:12:51,870 --> 00:12:53,610 Tell me what will be Moudud? 198 00:12:55,660 --> 00:12:59,740 OK, so I think compilation that I will not be there. 199 00:13:00,120 --> 00:13:00,390 Why? 200 00:13:01,150 --> 00:13:04,870 Because this I and this I, they both are different. 201 00:13:05,050 --> 00:13:05,230 Why? 202 00:13:05,230 --> 00:13:05,770 They are different? 203 00:13:05,800 --> 00:13:07,120 Because they have different scope. 204 00:13:07,960 --> 00:13:12,670 The scope of this eye is this record and this record. 205 00:13:12,790 --> 00:13:20,020 The scope of this eye is this record and this record, since these two eyes are different. 206 00:13:20,320 --> 00:13:21,400 They are independent. 207 00:13:23,260 --> 00:13:25,920 Now, add this line, I am bringing the value of I. 208 00:13:26,530 --> 00:13:34,990 So at this point of time, only, only when I exist, only when I exist. 209 00:13:35,440 --> 00:13:36,260 This I. 210 00:13:36,940 --> 00:13:38,230 Does not exist. 211 00:13:39,070 --> 00:13:39,890 This I. 212 00:13:40,180 --> 00:13:46,300 Does not exist outside records of loop. 213 00:13:48,300 --> 00:13:48,500 OK. 214 00:13:48,590 --> 00:13:49,790 So this I. 215 00:13:50,770 --> 00:13:52,510 Doesn't exist at this line. 216 00:13:53,440 --> 00:13:54,490 OK, so add this line. 217 00:13:54,550 --> 00:13:55,680 I have only one eye. 218 00:13:55,840 --> 00:13:57,040 Which is this one. 219 00:13:59,600 --> 00:14:06,250 Since I have only Varnay, I will print the value of the day and hence my would probably be a God visually. 220 00:14:09,040 --> 00:14:09,350 OK. 221 00:14:11,070 --> 00:14:13,190 So if you don't believe me, I can show you. 222 00:14:15,240 --> 00:14:21,630 So what I will do here, I just have to create two variables, and I know at this point of time only 223 00:14:21,630 --> 00:14:23,070 when I exist in the memory. 224 00:14:25,620 --> 00:14:26,910 Now, when I did this. 225 00:14:27,420 --> 00:14:29,070 Now they exist to in the memory. 226 00:14:29,100 --> 00:14:34,520 But those two, why they are different, why they're different because they have different scope. 227 00:14:36,710 --> 00:14:37,080 Okay. 228 00:14:38,880 --> 00:14:41,110 Now, I am not doing anything inside the loop. 229 00:14:42,870 --> 00:14:45,570 And here I am bringing the value of a. 230 00:14:49,230 --> 00:14:58,490 Now, again, headline number 23, there exist only one eye in the memory, and this is that I had somehow 231 00:14:58,530 --> 00:15:00,930 butchered we are garbage value simple. 232 00:15:05,880 --> 00:15:07,360 So the output is our garbage value. 233 00:15:08,350 --> 00:15:09,790 This was also the same case. 234 00:15:11,320 --> 00:15:12,400 Now, let's go into doubt. 235 00:15:18,910 --> 00:15:22,200 So when here I was having an thanks. 236 00:15:22,810 --> 00:15:23,900 So what was happening here? 237 00:15:25,540 --> 00:15:31,290 At this point of time, line number seven, there exist only 16 in the memory lane, number 10. 238 00:15:31,420 --> 00:15:34,660 They exist to extend their memory, but they both are different. 239 00:15:34,750 --> 00:15:35,350 Why different? 240 00:15:35,410 --> 00:15:38,860 Because different scope now at lane number 14. 241 00:15:39,280 --> 00:15:42,210 I am bringing the X at lane number 14. 242 00:15:42,280 --> 00:15:49,420 They exist only when X and the memory Y because this X as soon as this X will cross it boundary. 243 00:15:50,880 --> 00:15:52,330 It will not exist, okay? 244 00:15:52,650 --> 00:15:54,300 It will die or it will not exist. 245 00:15:55,020 --> 00:15:56,000 So headline number fording. 246 00:15:56,190 --> 00:15:58,860 They exist on live next in their memory, which is this one. 247 00:16:00,110 --> 00:16:05,930 But as soon as you reach line number 16, you are printing them well, if I come by, I will say I don't 248 00:16:05,930 --> 00:16:06,350 know I. 249 00:16:06,920 --> 00:16:07,760 Why you don't know? 250 00:16:08,000 --> 00:16:09,710 Because I exist. 251 00:16:10,850 --> 00:16:15,250 Well, the for loop, as well as the for loop end, and it doesn't exist in the memory. 252 00:16:18,440 --> 00:16:18,610 OK. 253 00:16:19,180 --> 00:16:24,150 So I hope you've got some feel of what is its global variable. 254 00:16:25,150 --> 00:16:29,020 So what we will do now and next we do I will cover what is global variable. 255 00:16:29,100 --> 00:16:32,370 And then next we do I will cover some more questions on scrollbar. 256 00:16:32,380 --> 00:16:32,890 Very well. 257 00:16:32,980 --> 00:16:34,420 And global variable mix. 258 00:16:35,590 --> 00:16:35,910 OK. 259 00:16:37,100 --> 00:16:41,590 So this is it for this video, if you have any doubt, you can ask me, OK? 260 00:16:42,340 --> 00:16:42,820 Thank you.