1 00:00:02,010 --> 00:00:02,670 Hello everyone. 2 00:00:02,670 --> 00:00:07,040 So in the last session we discussed what is different decks for using inheritance. 3 00:00:07,050 --> 00:00:08,610 I hope that part is clear. 4 00:00:08,610 --> 00:00:09,540 Now let's see the code 5 00:00:13,260 --> 00:00:14,570 so outline number 28. 6 00:00:14,600 --> 00:00:17,120 I am creating the object of the correctness. 7 00:00:17,130 --> 00:00:18,180 Okay so what will happen. 8 00:00:18,180 --> 00:00:23,490 So this is our weekly class and these are some of the properties. 9 00:00:23,520 --> 00:00:26,130 So at this land line number 28 what will happen. 10 00:00:26,130 --> 00:00:31,520 Default construct of the class will be called which will initialize the properties of difficult class. 11 00:00:31,620 --> 00:00:32,580 No doubt. 12 00:00:32,700 --> 00:00:36,030 Now line number twenty three I'm creating the object of got class. 13 00:00:36,040 --> 00:00:40,920 Now God is a special class white especially because it innate from difficult class. 14 00:00:40,920 --> 00:00:51,390 Okay so this is our card class and inside the god class we have some part of difficult class and some 15 00:00:51,390 --> 00:00:53,160 god specific properties. 16 00:00:53,160 --> 00:00:58,940 So the parties we have color and we have them ties. 17 00:00:59,220 --> 00:01:02,670 The third property which is the Mexican property will not be inherited. 18 00:01:03,030 --> 00:01:10,200 Okay so for creating the object of the Card class we have to create this vehicle class for creating 19 00:01:10,200 --> 00:01:11,170 kind of class object. 20 00:01:11,480 --> 00:01:11,950 Okay. 21 00:01:12,060 --> 00:01:16,710 So before greeting card class object we have to create this vehicle class object. 22 00:01:16,710 --> 00:01:21,090 So we have to initialize all those properties that are accessible to the car. 23 00:01:21,090 --> 00:01:31,570 Class Okay so when we write Ghazi so as soon as as soon as we create this kind of class object then 24 00:01:31,570 --> 00:01:36,720 first of all the color class constructed will be called okay. 25 00:01:36,770 --> 00:01:40,460 It will be called automatically it will be implicitly called okay. 26 00:01:40,520 --> 00:01:48,660 And then the guide class may be called Okay so via the victim class will be called first because first 27 00:01:48,690 --> 00:01:57,110 we have to create this part then only we can create this outer block in the memory okay. 28 00:01:57,130 --> 00:02:03,610 So when we write Ghazi see what will happen first the vehicle class constructor will be called so that 29 00:02:03,610 --> 00:02:04,720 we can initialize. 30 00:02:04,720 --> 00:02:09,820 We can create this part in the memory then that kind of constructor will be called so that we can create 31 00:02:09,850 --> 00:02:12,100 this outer block in the memory. 32 00:02:12,490 --> 00:02:13,010 Okay. 33 00:02:13,180 --> 00:02:20,780 So what do we the order of calling constructor in case of inheritance. 34 00:02:20,810 --> 00:02:24,470 So what will be the order of calling a strict linkage of inheritance. 35 00:02:24,470 --> 00:02:33,860 Suppose we have three classes Glass a class we inherited from Class A and glossy inherited from Class 36 00:02:33,860 --> 00:02:34,610 B. 37 00:02:34,700 --> 00:02:40,150 So if I create an object of Class E E then what will happen. 38 00:02:40,400 --> 00:02:42,990 Only the E class constructor will be called. 39 00:02:43,030 --> 00:02:51,890 Okay so this is a and it has some properties so only the E Class constructively because called no doubt. 40 00:02:51,900 --> 00:02:56,770 Now if I create the object of Class B then what will happen. 41 00:02:56,790 --> 00:03:05,600 So this is destructive for Class B it contains e and some B specific properties then first of all what 42 00:03:05,600 --> 00:03:06,700 will happen. 43 00:03:07,040 --> 00:03:11,910 Constructor it will be called and then construct the B will be called. 44 00:03:12,150 --> 00:03:17,300 Okay so first a class constructed with regard then because constructively with class because first we 45 00:03:17,300 --> 00:03:22,570 have to create this part then we can create the outer part. 46 00:03:22,580 --> 00:03:23,210 Okay. 47 00:03:23,360 --> 00:03:27,890 Now if I create the object of C class then what will happen. 48 00:03:27,890 --> 00:03:38,580 First of all this is the structure of class C it contains B and some C specific properties and B contains 49 00:03:38,640 --> 00:03:41,640 a and b specific properties. 50 00:03:41,970 --> 00:03:46,150 So first of all we have to create a So E class constructor will be called. 51 00:03:46,350 --> 00:03:48,870 Then we have to create B. 52 00:03:48,870 --> 00:03:52,800 So this B class constructor will be called and at last. 53 00:03:52,800 --> 00:03:55,570 This C class constructed will be called. 54 00:03:55,570 --> 00:04:01,010 Okay so I hope that you now understand the order of calling constructors in case of inheritance. 55 00:04:01,080 --> 00:04:04,140 Okay now let us verify our statement. 56 00:04:04,140 --> 00:04:05,030 So let's in 57 00:04:09,360 --> 00:04:16,110 Okay so let's make some constructors so I am creating a default constructor. 58 00:04:16,190 --> 00:04:23,440 Okay so default we could construct that and now inside the constructor let's create something see out 59 00:04:24,620 --> 00:04:26,210 the default construct that 60 00:04:31,620 --> 00:04:40,180 and now let us also create the default their default destructor for vehicle class. 61 00:04:40,270 --> 00:04:46,610 Okay so a special symbol and vehicle the go district. 62 00:04:46,720 --> 00:04:46,970 Okay 63 00:04:51,920 --> 00:04:53,630 and now let's do the same for God. 64 00:04:53,630 --> 00:05:01,220 Class also Okay so we will create the god class default constructor and district in constructor. 65 00:05:01,220 --> 00:05:01,580 Okay. 66 00:05:01,580 --> 00:05:09,300 So God now let us bring something C out. 67 00:05:09,460 --> 00:05:10,740 Car default constructed 68 00:05:19,280 --> 00:05:21,500 and now let us all to create the destructor. 69 00:05:21,520 --> 00:05:21,740 Okay 70 00:05:31,810 --> 00:05:40,210 okay so we have because class default constructed and destructor similarly called class or default constructor 71 00:05:40,240 --> 00:05:43,310 and destructor okay. 72 00:05:43,400 --> 00:05:45,340 Now what will happen. 73 00:05:48,270 --> 00:05:50,820 So add this line what will happen. 74 00:05:50,820 --> 00:05:53,490 So v class default constructor will be called. 75 00:05:53,520 --> 00:05:57,640 Okay so we call class default constructor will be called and add this line. 76 00:05:57,690 --> 00:06:04,140 Gotta see what will happen first the vacate class default construct that will be called and then the 77 00:06:04,140 --> 00:06:04,440 car. 78 00:06:04,440 --> 00:06:07,020 Class default constructor will be called. 79 00:06:07,110 --> 00:06:10,920 Okay now let's run this file to see the output. 80 00:06:10,940 --> 00:06:12,710 Now let's come and everything out 81 00:06:19,540 --> 00:06:21,920 okay so we call V and Ghazi. 82 00:06:21,970 --> 00:06:22,900 Now let's add this file 83 00:06:26,920 --> 00:06:27,190 okay. 84 00:06:27,200 --> 00:06:32,350 Now let us try to analyze what is the output. 85 00:06:32,440 --> 00:06:36,150 So first the vocal class constructor will be called. 86 00:06:36,190 --> 00:06:39,520 Now this construct based being called for creating the VK class object. 87 00:06:39,550 --> 00:06:43,660 Okay so this first output is due to be called class. 88 00:06:43,660 --> 00:06:46,690 Now the second output is we are creating the called Class object. 89 00:06:46,960 --> 00:06:52,550 So first the vehicle default constructor will be called then called constructor will recall. 90 00:06:52,550 --> 00:06:56,050 Okay so the first line is do you do the class. 91 00:06:56,060 --> 00:07:01,610 Now the next two line are due to Card class and the order for District is just opposite the order of 92 00:07:01,610 --> 00:07:02,610 the inheritance. 93 00:07:02,630 --> 00:07:07,040 So first the card destructively McCall then the school district. 94 00:07:07,070 --> 00:07:09,240 So these are due to go out of class. 95 00:07:09,290 --> 00:07:12,730 And the last line it is due to the class. 96 00:07:12,740 --> 00:07:17,930 Okay so the order of district Burke called is just the opposite of the inheritance. 97 00:07:18,980 --> 00:07:24,610 Okay so the first line this is due to class the next to line. 98 00:07:24,680 --> 00:07:26,030 This is due to card class. 99 00:07:26,060 --> 00:07:29,440 Again the next two line are due to card class destructor. 100 00:07:29,540 --> 00:07:32,350 And the last line is due to the class destructor. 101 00:07:33,230 --> 00:07:38,600 Okay so the order for District based oppose it off the order of the inheritance. 102 00:07:38,600 --> 00:07:39,160 Okay. 103 00:07:39,260 --> 00:07:40,640 Now what is happening here is 104 00:07:45,630 --> 00:07:54,350 so had this line implicitly what happens is it is something like this so we have started about initialization 105 00:07:54,350 --> 00:07:55,300 list. 106 00:07:55,490 --> 00:08:00,980 So what is happening here is when we are writing code to see what will happen it will call its default 107 00:08:00,980 --> 00:08:01,910 constructor. 108 00:08:02,030 --> 00:08:08,950 So when we will reach this default construct but it is implicitly something like this initialization 109 00:08:08,950 --> 00:08:09,480 list. 110 00:08:09,520 --> 00:08:09,780 Okay. 111 00:08:09,790 --> 00:08:10,810 So what will happen. 112 00:08:10,900 --> 00:08:13,040 What is the use of initialization list. 113 00:08:13,090 --> 00:08:20,000 So before entering this constructor before reaching line number 29 we will go to the vehicle construct. 114 00:08:20,020 --> 00:08:24,420 Okay so that's why this code is getting printed first. 115 00:08:24,550 --> 00:08:28,000 This called the default construct is getting printed first. 116 00:08:28,030 --> 00:08:35,380 Okay so okay so implicitly this is something like this but you do not need to write this here because 117 00:08:35,860 --> 00:08:39,230 the vehicle class default construct it is called implicitly okay. 118 00:08:39,250 --> 00:08:42,790 This call automatically so we don't need to write this. 119 00:08:42,790 --> 00:08:43,510 Okay. 120 00:08:43,540 --> 00:08:48,750 Now what will happen if I create a better mid priced vehicle constructor. 121 00:08:48,790 --> 00:08:57,830 Okay so we have a better motorized vehicle constructor it takes an argument Lex's ID and what it does 122 00:08:57,830 --> 00:09:03,220 is Max speed is Z. 123 00:09:03,470 --> 00:09:03,800 Okay. 124 00:09:03,800 --> 00:09:05,070 So what will happen now. 125 00:09:06,110 --> 00:09:12,650 Okay so what happened is so when we write Ghazi what will happen. 126 00:09:12,690 --> 00:09:16,300 It will call their default constructor of the vehicle class. 127 00:09:16,410 --> 00:09:16,800 Okay. 128 00:09:16,890 --> 00:09:20,670 So always the default constructed will be called automatically. 129 00:09:20,880 --> 00:09:25,320 Okay but if we want to call the betterment based construct of the vehicle class then we have to call 130 00:09:25,410 --> 00:09:27,140 explicitly okay. 131 00:09:27,330 --> 00:09:31,320 I'm repeating myself when we write Ghazi what it will do. 132 00:09:31,320 --> 00:09:36,980 It will call the default constructor of the vehicle class. 133 00:09:37,300 --> 00:09:44,430 But now what I want is I have a better memorized constructor parameter traced the call constructor and 134 00:09:44,640 --> 00:09:51,140 I want to call this better my place constructor I want to call this better taste construct better. 135 00:09:51,140 --> 00:09:54,060 So what we have to do we have to call explicitly 136 00:09:56,640 --> 00:10:00,320 and this is implicitly we don't need to write anything. 137 00:10:00,360 --> 00:10:05,950 This will recall implicitly but for calling the paramedics constructor we have to call explicitly. 138 00:10:06,000 --> 00:10:12,300 So what is this index so in Texas very simple we will write God C then with the help of initialization 139 00:10:12,300 --> 00:10:14,320 list we call. 140 00:10:14,580 --> 00:10:19,600 And since it takes only one argument so we will give one argument okay. 141 00:10:19,710 --> 00:10:21,900 And that's all okay. 142 00:10:21,910 --> 00:10:26,600 So this is just an index for calling the betterment days constructed. 143 00:10:26,920 --> 00:10:27,570 Okay. 144 00:10:27,670 --> 00:10:35,920 And for default construct this index is very simple Ghazi and simple we call okay. 145 00:10:36,020 --> 00:10:39,570 But in case of default we do not need to write this. 146 00:10:39,650 --> 00:10:48,300 Okay now let us call the param at base constructor so I want to call this better my test constructor. 147 00:10:48,340 --> 00:10:51,130 So I have to pass a value let's say 5. 148 00:10:51,850 --> 00:10:52,150 Okay. 149 00:10:52,180 --> 00:10:53,470 Now this is correct. 150 00:10:53,590 --> 00:10:57,960 Okay print something so that we can verify. 151 00:10:58,060 --> 00:11:04,530 So we'll see out we call barometer based constructor 152 00:11:10,540 --> 00:11:11,290 okay. 153 00:11:11,470 --> 00:11:13,580 So now let us comment out everything. 154 00:11:13,600 --> 00:11:15,600 So to avoid any confusion. 155 00:11:15,640 --> 00:11:17,670 So we have only got to see here. 156 00:11:18,560 --> 00:11:23,800 Now we will try to analyse for boolean output so Ghazi see will. 157 00:11:23,810 --> 00:11:30,020 We will reach here Ghazi and in the initialization list we are calling the better metrics constructor 158 00:11:31,040 --> 00:11:32,240 of the weekly class. 159 00:11:32,240 --> 00:11:33,610 So we will reach here. 160 00:11:33,740 --> 00:11:39,710 So the output will be we call a paramedic based constructor and then got a default constructor. 161 00:11:40,210 --> 00:11:40,480 Okay. 162 00:11:40,490 --> 00:11:42,030 So this will be our output. 163 00:11:42,170 --> 00:11:47,030 And then the order of district pay is just the opposite of the order of inheritance. 164 00:11:47,150 --> 00:11:47,750 Okay. 165 00:11:47,810 --> 00:11:49,040 So now let us turn our file 166 00:11:53,590 --> 00:11:59,980 okay so we can see here is we call paramedics construct a card then card default construct a card and 167 00:12:00,030 --> 00:12:02,710 our district pays deposit first. 168 00:12:02,890 --> 00:12:07,650 The car will be destroyed and then the vehicle will be destroyed okay. 169 00:12:08,150 --> 00:12:12,730 So everything is running fine okay. 170 00:12:12,780 --> 00:12:15,780 So now let's take more examples. 171 00:12:15,780 --> 00:12:16,510 Okay. 172 00:12:16,710 --> 00:12:19,710 So okay let's remove this 173 00:12:23,080 --> 00:12:27,030 and now let us also commend the vehicle default constructor. 174 00:12:27,160 --> 00:12:27,430 Okay 175 00:12:30,680 --> 00:12:33,980 so I'm commenting out we a default constructor. 176 00:12:34,160 --> 00:12:34,720 Okay. 177 00:12:34,730 --> 00:12:40,300 So now their default construct of the vehicle class is not visible since we have created our own betterment 178 00:12:40,310 --> 00:12:41,210 based construct. 179 00:12:42,050 --> 00:12:42,310 Okay. 180 00:12:42,320 --> 00:12:47,010 I'm repeating myself since we have created our own betterment based construct that the vehicle. 181 00:12:47,010 --> 00:12:50,600 Class default construct is not visible to us any. 182 00:12:50,630 --> 00:12:51,670 Now what will happen. 183 00:12:51,710 --> 00:12:54,540 Can we create our class object now. 184 00:12:54,620 --> 00:12:56,180 So will this line work. 185 00:12:56,250 --> 00:13:02,540 Ghazi will it work on artwork so the output is it will not work. 186 00:13:02,810 --> 00:13:03,180 Okay. 187 00:13:03,830 --> 00:13:07,670 So let us in this file so we will get an added. 188 00:13:07,830 --> 00:13:11,880 And now let us try to analyze what is the advice you are getting an added. 189 00:13:11,880 --> 00:13:12,170 Okay 190 00:13:16,630 --> 00:13:20,600 so when we write Ghazi what it will do. 191 00:13:20,800 --> 00:13:25,720 It will try to call the default constructor of the because class and their default construct of the 192 00:13:25,730 --> 00:13:30,370 vehicle class is not there because we have created our own parameters constructor. 193 00:13:30,460 --> 00:13:32,370 So this line is wrong. 194 00:13:32,410 --> 00:13:33,960 This line will throw us at it. 195 00:13:34,060 --> 00:13:36,330 So we cannot create objects of the car class. 196 00:13:36,360 --> 00:13:36,640 No. 197 00:13:37,250 --> 00:13:39,010 Okay so what we have to do. 198 00:13:39,190 --> 00:13:40,990 So here we have a compulsion. 199 00:13:41,140 --> 00:13:41,370 Okay. 200 00:13:41,380 --> 00:13:47,170 So now in order to create a guide class object there is a compulsion now that we have to call the parametric 201 00:13:47,200 --> 00:13:50,830 constructor or difficult class because the default one is not visible. 202 00:13:51,220 --> 00:13:51,810 Okay. 203 00:13:52,060 --> 00:13:57,300 So here we have a compulsion in order to create the object of the second class. 204 00:13:57,310 --> 00:14:03,430 We have to call the paramedics constructor or difficult class because the default construct of difficult 205 00:14:03,450 --> 00:14:05,650 classes not there. 206 00:14:05,650 --> 00:14:06,280 Okay. 207 00:14:06,280 --> 00:14:09,950 Now disconnect correct if you will render a file you will not get any added. 208 00:14:10,710 --> 00:14:13,750 Okay so our code is working without any errors. 209 00:14:13,750 --> 00:14:14,020 Okay. 210 00:14:14,020 --> 00:14:15,890 Now this is not the right way. 211 00:14:15,910 --> 00:14:17,140 So what is the right way. 212 00:14:17,170 --> 00:14:23,300 So that I ways first we will take the input and then we will pass the X here. 213 00:14:23,380 --> 00:14:23,800 Okay. 214 00:14:23,920 --> 00:14:25,170 So this is the right way. 215 00:14:25,210 --> 00:14:31,270 Now if you will write Ghazi we have to change this also because Ghazi will call the default constructor 216 00:14:31,450 --> 00:14:36,520 and we do not have default constructor we have better my taste this is now a paramedic's constructor. 217 00:14:36,520 --> 00:14:37,600 So let us change 218 00:14:42,720 --> 00:14:48,480 okay so we cannot create objects like this because we do not have a default constructor because we we 219 00:14:48,480 --> 00:14:50,870 have created our own parameters constructor. 220 00:14:50,970 --> 00:14:57,530 So in order to create the object we have to pass a value we have to call paramedics constructor. 221 00:14:57,630 --> 00:14:59,360 Okay now let's on this file 222 00:15:02,370 --> 00:15:04,080 okay so everything is working fine. 223 00:15:04,320 --> 00:15:04,980 Okay. 224 00:15:05,010 --> 00:15:07,120 Also no let us try to analyze the output. 225 00:15:07,200 --> 00:15:12,360 So first the vehicle class better my desk constructor will be called then God better my test constructively 226 00:15:12,360 --> 00:15:14,870 be called and then the order of District based deposit. 227 00:15:14,910 --> 00:15:17,670 Okay okay. 228 00:15:17,680 --> 00:15:27,010 So now let us take one more example so now let us create another class Gaussian density okay. 229 00:15:27,090 --> 00:15:34,910 So this class from the city let us and headed this class in that it's from the court class. 230 00:15:34,920 --> 00:15:42,070 Okay now let us also create its gastric band destructor okay 231 00:15:53,040 --> 00:15:54,190 city constructed 232 00:16:01,010 --> 00:16:01,480 unnecessary. 233 00:16:01,500 --> 00:16:03,510 The forward concept is better. 234 00:16:03,540 --> 00:16:10,810 Okay so let's leave it you deconstruct only and it will also create or unnecessary destructor 235 00:16:25,040 --> 00:16:25,610 okay. 236 00:16:25,630 --> 00:16:28,340 So now we have T levels of inheritance. 237 00:16:28,350 --> 00:16:28,700 No. 238 00:16:28,990 --> 00:16:29,290 Okay 239 00:16:32,690 --> 00:16:40,010 so what we have is we have this little glass God glass inherits from the victim glass and there are 240 00:16:40,030 --> 00:16:43,630 only 30 glass inherits from the car glass. 241 00:16:43,640 --> 00:16:45,870 Okay so three levels of inheritance is there. 242 00:16:45,870 --> 00:16:46,160 No. 243 00:16:46,820 --> 00:16:47,330 Okay. 244 00:16:47,330 --> 00:16:49,820 So when we create the audacity object. 245 00:16:49,940 --> 00:16:50,900 So if I write 246 00:16:53,670 --> 00:16:57,020 letter at the edge then what will happen. 247 00:16:57,020 --> 00:16:59,500 First of all it will call. 248 00:16:59,600 --> 00:17:02,330 So what will be the order of inheritance. 249 00:17:02,330 --> 00:17:02,860 Okay. 250 00:17:02,900 --> 00:17:09,830 So first the victim class object will be called the class will be called then the car class construct 251 00:17:09,830 --> 00:17:12,800 that will be called and then the university construct that will be called. 252 00:17:12,830 --> 00:17:14,380 So this will be the order. 253 00:17:14,390 --> 00:17:19,510 Now what will happen when we write this object on the city edge what it will do. 254 00:17:19,670 --> 00:17:20,660 It will reach here. 255 00:17:20,750 --> 00:17:23,090 Line number 48 and implicitly what will happen. 256 00:17:23,090 --> 00:17:25,100 Got a class default constructor will be called. 257 00:17:25,580 --> 00:17:26,280 Okay. 258 00:17:26,570 --> 00:17:33,440 So we will call God class default constructor and God class default constructor is not visible to us. 259 00:17:33,590 --> 00:17:33,890 Why. 260 00:17:33,920 --> 00:17:38,040 Because we have created betterment based constructor so we will get an added. 261 00:17:38,060 --> 00:17:44,030 Okay so this line will throw at it why it will throw at it because the car class default constructor 262 00:17:44,030 --> 00:17:47,390 will be called and the car class default constructor is not there. 263 00:17:47,870 --> 00:17:53,220 Okay let's see dieted Okay so let's come and out everything. 264 00:17:55,970 --> 00:18:00,690 So we are creating an object of unnecessary. 265 00:18:00,820 --> 00:18:05,100 So what it will do we will reach this line for dessert. 266 00:18:05,110 --> 00:18:09,850 It will call the car last default constructor and the Goddard class default construct based not there. 267 00:18:09,910 --> 00:18:10,300 Right. 268 00:18:10,300 --> 00:18:15,560 We call car class default constructor because implicitly default constructor is called. 269 00:18:15,670 --> 00:18:16,190 Okay. 270 00:18:16,300 --> 00:18:17,430 So we will get an idea. 271 00:18:17,560 --> 00:18:17,990 Okay. 272 00:18:19,660 --> 00:18:22,800 So we are getting an added now in order to resolve this error. 273 00:18:22,810 --> 00:18:26,180 What we have to do since we only have better my constructor. 274 00:18:26,290 --> 00:18:28,510 So we have to call this better my test constructor. 275 00:18:28,510 --> 00:18:33,040 Now there is a compulsion here we have to use the initialization list. 276 00:18:33,370 --> 00:18:36,690 So God 5 in order to call the paramedics constructor. 277 00:18:37,270 --> 00:18:39,750 Okay so now it will work. 278 00:18:39,820 --> 00:18:43,980 Okay now we have to explicitly call paramedics constructor. 279 00:18:43,990 --> 00:18:45,130 Now let's add in this file 280 00:18:49,080 --> 00:18:55,380 okay so what is happening here is this is daughter first that we could last better my test constructor 281 00:18:55,440 --> 00:19:00,780 then guided by my place constructor and the whole city construct and the order of District based deposit. 282 00:19:00,840 --> 00:19:08,070 Okay so everything is running fine now if I want to pass parameters. 283 00:19:08,440 --> 00:19:20,020 Suppose I want to pass barometers so God and anyway so X will go to the victim class and for Y what 284 00:19:20,020 --> 00:19:22,900 we are planning to use here is the let's say number of gears 285 00:19:26,780 --> 00:19:29,860 number of gears is Y Okay. 286 00:19:30,210 --> 00:19:35,700 Now what will happen here is since the car class is now taking two arguments has input. 287 00:19:36,080 --> 00:19:39,750 So let's see this is ridiculous. 288 00:19:39,780 --> 00:19:46,760 It takes two arguments x and y okay because the car class constructor takes two arguments so we'll pass 289 00:19:46,790 --> 00:19:49,750 X and we will pass Y Okay. 290 00:19:49,850 --> 00:19:55,340 Now for creating the horn that's the object we cannot create object like this because it will call the 291 00:19:55,340 --> 00:20:00,470 default concept then default construct is not dead because it's a paramedic's constructor No. 292 00:20:00,500 --> 00:20:06,050 Okay so we have to call better my test constructor we have to pass two values use every possible values 293 00:20:06,410 --> 00:20:09,960 lecture two values that four and five okay. 294 00:20:10,150 --> 00:20:13,390 So what will happen better my desk and said I will be called. 295 00:20:13,420 --> 00:20:17,920 So it will reach here X and Y will be passed to the god class parameters constructor. 296 00:20:17,980 --> 00:20:21,240 So a number of games that way and it will pass x. 297 00:20:21,400 --> 00:20:27,910 So from here we will reach the vehicle class and first of all because last better make this constructor 298 00:20:27,960 --> 00:20:33,830 called then God class Parramatta's constructor called and then the homeless you deconstruct the code 299 00:20:33,910 --> 00:20:35,130 so this will be our output. 300 00:20:35,230 --> 00:20:36,540 Okay next on this file 301 00:20:40,700 --> 00:20:40,990 okay. 302 00:20:41,030 --> 00:20:46,070 So first of all we get class paramedic's constructor then God and then horn deputy and the District 303 00:20:46,070 --> 00:20:47,310 based just the opposite. 304 00:20:47,570 --> 00:20:53,360 Okay so when lasting so one last thing is. 305 00:20:53,360 --> 00:20:58,610 So we have this weekly class called Class in added from the working class and the whole industry to 306 00:20:58,610 --> 00:21:02,210 cut down this class inherits from the car class. 307 00:21:02,210 --> 00:21:02,870 Okay. 308 00:21:02,870 --> 00:21:06,490 So a class can only call the constructor of its immediate parent. 309 00:21:06,650 --> 00:21:07,300 Okay. 310 00:21:07,340 --> 00:21:11,410 A class can only call the constructor of its immediate appearance. 311 00:21:11,450 --> 00:21:13,220 So this is right. 312 00:21:13,220 --> 00:21:22,190 And this is wrong okay our class can only call the concept of its immediate parent. 313 00:21:22,720 --> 00:21:23,300 Okay. 314 00:21:23,380 --> 00:21:29,050 Similarly our class can call the construct of the working class but don't assume the class cannot call 315 00:21:29,200 --> 00:21:31,490 the constructor of the working class. 316 00:21:31,540 --> 00:21:33,180 Okay so that's all from my side. 317 00:21:33,190 --> 00:21:33,610 Thank you.