1 00:00:01,700 --> 00:00:02,370 Hello everyone. 2 00:00:02,400 --> 00:00:05,780 So till now we have discussed in detail about inheritance. 3 00:00:05,810 --> 00:00:07,640 I hope that part is now clear. 4 00:00:07,640 --> 00:00:11,150 Now in this video I want to discuss next topic of Opes. 5 00:00:11,170 --> 00:00:17,900 Note This polymorphism so polymorphism means many forms okay. 6 00:00:18,000 --> 00:00:24,930 So in terms of code we can see polymorphism means there a set of code behave differently in different 7 00:00:24,930 --> 00:00:25,800 situation. 8 00:00:25,800 --> 00:00:26,230 Okay. 9 00:00:26,310 --> 00:00:28,320 So there are two types of polymorphism. 10 00:00:28,320 --> 00:00:33,870 So first one is the compiler that polymorphism and the second one is runtime polymorphism. 11 00:00:33,870 --> 00:00:40,080 So compile time polymorphism means how a set of code will behave outside of court will behave will we 12 00:00:40,080 --> 00:00:46,980 decided at the compile time Okay and then type one on one with him how the set of code will behave will 13 00:00:46,980 --> 00:00:50,550 be decided at the current time okay. 14 00:00:50,580 --> 00:00:57,020 So in this we do our focus is on compile time polymorphism and the next we deal we will cover in time 15 00:00:57,030 --> 00:00:58,970 polymorphism as well okay. 16 00:00:59,070 --> 00:01:05,090 So compile time polymorphism to compile time polymorphism can be achieved using movies. 17 00:01:05,100 --> 00:01:12,310 So the first way to achieve compile them polymorphism is function overloading which we have already 18 00:01:12,310 --> 00:01:13,260 started. 19 00:01:13,360 --> 00:01:20,050 And the second way to achieve compile time polymorphism is operator overloading which we have also started 20 00:01:20,170 --> 00:01:22,280 in OBS in details. 21 00:01:22,450 --> 00:01:25,970 Okay so what is the meaning of function overloading. 22 00:01:26,020 --> 00:01:30,890 So it means that different functions with the same name but destructor will be different. 23 00:01:31,720 --> 00:01:35,820 Okay so we will have many functions we will have many functions. 24 00:01:35,980 --> 00:01:39,330 Those function will have the same name but destructor will be different. 25 00:01:39,340 --> 00:01:41,580 Okay so let's see in code. 26 00:01:41,650 --> 00:01:41,950 Okay. 27 00:01:46,120 --> 00:01:53,860 So I have this called so as we can see here we have many functions with the same name based function 28 00:01:53,860 --> 00:01:59,320 test function test function all the three functions have the same name but then the modified arguments 29 00:01:59,320 --> 00:02:00,140 are different. 30 00:02:00,160 --> 00:02:07,410 So if I will call best then it will call this function because a number of 5 arguments are do. 31 00:02:07,860 --> 00:02:16,290 If I will write test 1 then this function will be called okay because of the number of arguments. 32 00:02:16,370 --> 00:02:20,530 So we are deciding at the compile them which function will be called. 33 00:02:20,650 --> 00:02:21,350 Okay. 34 00:02:21,380 --> 00:02:24,350 So we are deciding that the compiler which function will be called. 35 00:02:24,390 --> 00:02:29,300 That's why we can use function overloading to achieve compile time polymorphism. 36 00:02:29,300 --> 00:02:29,900 Okay. 37 00:02:29,960 --> 00:02:32,590 So what will happen if I create one more function. 38 00:02:32,600 --> 00:02:39,080 Suppose I have these three functions and now I am creating one more function by then I will the function 39 00:02:39,080 --> 00:02:43,370 is void and the function name is same as test. 40 00:02:43,430 --> 00:02:50,130 Okay the function name is best and we also have a function in test. 41 00:02:50,360 --> 00:02:55,790 So among these two functions only the return type is different here there than there was in PJ and here 42 00:02:55,790 --> 00:02:58,440 there than diapers void everything the same. 43 00:02:58,460 --> 00:02:58,750 Okay. 44 00:02:58,750 --> 00:03:01,790 Same function name and the number of arguments of 0. 45 00:03:01,820 --> 00:03:02,360 Okay. 46 00:03:02,390 --> 00:03:04,240 We are not receiving any argument. 47 00:03:04,400 --> 00:03:08,840 So one thing that I wondered earlier is we cannot differentiate between these two function with the 48 00:03:08,840 --> 00:03:09,970 help of return type. 49 00:03:09,980 --> 00:03:10,680 Okay. 50 00:03:10,700 --> 00:03:12,950 You don't type with the help of return type. 51 00:03:12,950 --> 00:03:16,020 We cannot differentiate between these two functions. 52 00:03:16,070 --> 00:03:16,550 Okay. 53 00:03:16,670 --> 00:03:23,000 If I will call from the mean test then the compiler will get confused which function to call this one 54 00:03:23,360 --> 00:03:25,250 or this one. 55 00:03:25,250 --> 00:03:27,510 Okay so there will be ambiguity. 56 00:03:27,500 --> 00:03:30,380 The compiler will get confused among these two functions. 57 00:03:30,470 --> 00:03:33,670 So these two functions cannot be created in one file. 58 00:03:34,300 --> 00:03:34,790 Okay. 59 00:03:34,880 --> 00:03:37,340 We cannot differentiate with the help of return type. 60 00:03:37,460 --> 00:03:42,500 If you want to differentiate if you want to differentiate then with the help of function name we can 61 00:03:42,500 --> 00:03:47,330 differentiate with the help of function name the number of arguments and the type of argument but not 62 00:03:47,330 --> 00:03:49,130 with the return type. 63 00:03:49,130 --> 00:03:54,960 Okay now now we have already know where this function overloading. 64 00:03:55,010 --> 00:03:57,480 Now let's see what is operator overloading. 65 00:03:57,530 --> 00:04:04,060 So if you remember we have discussed about operator overloading in detail in section only. 66 00:04:04,130 --> 00:04:04,570 Okay. 67 00:04:04,700 --> 00:04:06,940 So let's take the example of plus operator. 68 00:04:07,010 --> 00:04:10,910 Okay so let's take the example of plus operator. 69 00:04:10,910 --> 00:04:14,650 So when I write two plus three output will be five. 70 00:04:14,660 --> 00:04:17,410 So here plus adds to integer. 71 00:04:17,660 --> 00:04:21,190 When I write three point five plus let's say one point five. 72 00:04:21,240 --> 00:04:23,640 And I would probably be five point zero. 73 00:04:23,700 --> 00:04:32,140 So plus operator add to the doubles here if I write correctly a plus character B then word plus operator 74 00:04:32,150 --> 00:04:37,490 will lower it will convert these two values in goods ask I value so this will be 97 and this will be 75 00:04:37,490 --> 00:04:38,090 98. 76 00:04:38,480 --> 00:04:40,610 So plus add two characters here. 77 00:04:40,610 --> 00:04:45,800 So we have only one operator which is the plus operator and plus operators behaving differently in different 78 00:04:45,800 --> 00:04:46,940 situation. 79 00:04:46,940 --> 00:04:47,490 Okay. 80 00:04:47,540 --> 00:04:52,820 If you remember the complex number class we have overloaded the plus operator for complex number class. 81 00:04:52,820 --> 00:04:58,970 Then if I write seven plus you do then here the plus operator is working differently. 82 00:04:59,220 --> 00:04:59,690 Okay. 83 00:04:59,760 --> 00:05:04,310 So we are deciding at the compile time only that how the operator will work. 84 00:05:04,320 --> 00:05:04,590 Okay. 85 00:05:04,590 --> 00:05:09,000 So with the help of operator overloading we can achieve compile time polymorphism. 86 00:05:09,000 --> 00:05:09,300 Okay. 87 00:05:09,330 --> 00:05:16,010 So I hope these two are very clear how we are achieving compile them but in my wisdom we are deciding 88 00:05:16,010 --> 00:05:19,550 at the compile them only that what a set of code will do. 89 00:05:20,140 --> 00:05:20,810 Okay. 90 00:05:20,810 --> 00:05:22,910 Now there is a third way. 91 00:05:23,130 --> 00:05:29,090 There is a territory also to achieve the compile type polymorphism and it is called Method overwriting 92 00:05:29,150 --> 00:05:30,990 or we can save function overwriting. 93 00:05:31,010 --> 00:05:31,820 Okay. 94 00:05:32,150 --> 00:05:35,630 Matador function overwriting. 95 00:05:35,770 --> 00:05:39,930 Now let us try to understand what is the meaning of function overwriting. 96 00:05:40,030 --> 00:05:40,330 Okay. 97 00:05:42,750 --> 00:05:51,690 Now okay so where does functional writing so let's say I have two classes Class A and Class B B in that 98 00:05:51,690 --> 00:05:53,200 it's class A. 99 00:05:53,440 --> 00:06:00,790 And so is the parent class and being taught based class and b d child that I have to class. 100 00:06:01,660 --> 00:06:05,050 Okay now suppose Class E has a brain function 101 00:06:07,700 --> 00:06:11,350 and we have also created a brain function inside Class B. 102 00:06:11,350 --> 00:06:13,160 We also use brain function of its own. 103 00:06:13,190 --> 00:06:13,970 So what it will have. 104 00:06:14,000 --> 00:06:19,700 So what will happen this brain function will override this brain function. 105 00:06:19,740 --> 00:06:22,580 Okay now let us understand with the help of code. 106 00:06:22,650 --> 00:06:22,860 Okay 107 00:06:26,450 --> 00:06:33,400 so I have this class so I have a class with can and I have a class got so inside the class we call I 108 00:06:33,410 --> 00:06:37,340 have a brain function and inside the car class so called class. 109 00:06:37,340 --> 00:06:43,790 First of all it in that it's from the class and it is and it is also having a brain function. 110 00:06:43,850 --> 00:06:48,290 Okay so what will happen this brain function will override this print function. 111 00:06:48,290 --> 00:06:57,290 Now what I want to convey here is let's say we are creating objects so I am creating object of the class 112 00:06:58,510 --> 00:07:01,740 and let's see I am also creating the object of kind of class. 113 00:07:01,810 --> 00:07:05,260 Okay so what do you with the order of the constructor call. 114 00:07:05,860 --> 00:07:10,990 So we have already discussed about the order of constructor called but let's say let's revise it again. 115 00:07:10,990 --> 00:07:12,050 Let's recap. 116 00:07:12,190 --> 00:07:18,700 So in this case what will happen only DV Could a class constructor will be called and in this case first 117 00:07:18,820 --> 00:07:23,270 the vehicle's less constructor will be called and then the of class constructor will be called. 118 00:07:23,280 --> 00:07:25,810 Okay so what is the structure of working class. 119 00:07:25,810 --> 00:07:35,420 So this is some political class and inside and it and it has print function so this is called class 120 00:07:35,540 --> 00:07:38,240 and it has the class. 121 00:07:38,240 --> 00:07:43,810 It has print function and the Car class also has brain function of its own. 122 00:07:43,850 --> 00:07:49,880 Okay so now if I run this file what will happen first of all the class constructor will be called and 123 00:07:49,880 --> 00:07:55,520 in this case first class and then called class constructor but I have not created any constructor so 124 00:07:55,550 --> 00:07:57,720 we will not be able to see the messages. 125 00:07:57,770 --> 00:07:58,270 Okay. 126 00:07:58,430 --> 00:08:00,920 Now what will happen if I call the print function. 127 00:08:00,920 --> 00:08:09,020 So if I write we don't print and if I write see dark print then what do we think what will happen. 128 00:08:09,020 --> 00:08:14,330 So we already know we don't print it will call the print function of the vehicle class so the output 129 00:08:14,330 --> 00:08:15,270 will be vehicle. 130 00:08:15,380 --> 00:08:20,840 And if I call you Lord print what will happen it will call the print function of the God class. 131 00:08:21,080 --> 00:08:24,700 Okay so the output will be God okay. 132 00:08:24,800 --> 00:08:29,450 So we are deciding at the compile time which function to be called. 133 00:08:29,450 --> 00:08:30,560 Okay. 134 00:08:30,560 --> 00:08:31,660 I am repeating myself. 135 00:08:31,700 --> 00:08:35,000 We are deciding at the compile time or leaders which function will be called. 136 00:08:35,030 --> 00:08:37,480 If we have multiple options available to us. 137 00:08:37,490 --> 00:08:40,630 So in this case I have multiple options available to us. 138 00:08:40,670 --> 00:08:45,380 I have two print functions so I am deciding at the compile them only that this print function would 139 00:08:45,380 --> 00:08:45,880 be called. 140 00:08:45,920 --> 00:08:52,790 Now how I am able to decided to compile them because we can see here this week it belongs to vehicle 141 00:08:52,850 --> 00:08:53,630 object. 142 00:08:53,630 --> 00:08:54,850 This is a vehicle object. 143 00:08:54,920 --> 00:08:59,750 So when I write we document it will call the print function of the vehicle class. 144 00:08:59,750 --> 00:09:01,740 Now here I am writing C document. 145 00:09:01,760 --> 00:09:07,770 Now C is an object of God class so it will call the print function of the God class. 146 00:09:07,850 --> 00:09:10,100 So that's why this print function will be called. 147 00:09:10,160 --> 00:09:14,820 So with the help of type of object we can decide which function will be called. 148 00:09:14,840 --> 00:09:16,540 Okay now let's win this fight. 149 00:09:18,670 --> 00:09:23,530 Okay so first of all let's write we don't print and see Dortmund 150 00:09:29,360 --> 00:09:30,610 no alerts on this file 151 00:09:34,180 --> 00:09:37,120 so the output this vehicle and God. 152 00:09:37,120 --> 00:09:39,150 We don't print and see Dortmund. 153 00:09:39,340 --> 00:09:43,470 Now if the car doesn't have any print function then we will call. 154 00:09:43,920 --> 00:09:44,160 Okay. 155 00:09:44,170 --> 00:09:51,150 So what I want to say here is if I do not have let's see the car plus do not have been functional for 156 00:09:51,190 --> 00:09:54,450 John so we know what will happen. 157 00:09:56,240 --> 00:10:01,260 So if the car doesn't have brain function of its own then we will call the print function of the vehicle 158 00:10:01,380 --> 00:10:02,190 class. 159 00:10:02,390 --> 00:10:02,690 Okay. 160 00:10:02,690 --> 00:10:06,200 And if because class doesn't have brain function also then it will throw it in. 161 00:10:06,230 --> 00:10:07,870 Okay so this land throws at it. 162 00:10:07,940 --> 00:10:10,340 If the vehicle doesn't have print function. 163 00:10:10,400 --> 00:10:13,640 Okay now let's take one more example. 164 00:10:13,700 --> 00:10:14,290 Okay. 165 00:10:14,300 --> 00:10:17,270 Now here we are creating the objects statically. 166 00:10:17,300 --> 00:10:19,940 Now what will happen if I create the object manually. 167 00:10:19,970 --> 00:10:28,190 So we could start we let's say V1 because V has really been created. 168 00:10:28,220 --> 00:10:32,290 Now this is new we call okay. 169 00:10:32,340 --> 00:10:33,570 So what will happen now. 170 00:10:34,950 --> 00:10:37,610 So what is happening here is that this line what will happen. 171 00:10:37,890 --> 00:10:43,820 So this is when and this even points to a vehicle object. 172 00:10:43,830 --> 00:10:51,830 So this is a vehicle object and this is a vehicle point that even is a vehicle pointer size will be 173 00:10:51,830 --> 00:10:54,820 eight bytes okay. 174 00:10:54,830 --> 00:11:00,850 Now what if I create another object let's say I am creating what if I will right. 175 00:11:00,860 --> 00:11:02,990 Because start we do. 176 00:11:02,990 --> 00:11:03,270 Okay. 177 00:11:03,280 --> 00:11:04,480 So what will happen. 178 00:11:04,520 --> 00:11:08,080 So a view to point to a vehicle point that will be created. 179 00:11:08,120 --> 00:11:11,420 And it will point to a random garbage location. 180 00:11:11,480 --> 00:11:12,010 Okay. 181 00:11:12,020 --> 00:11:18,080 And if we want to initialize if we want to initialize this vehicle pointer Then we can pointed towards 182 00:11:18,170 --> 00:11:18,650 any vehicle. 183 00:11:18,880 --> 00:11:19,390 Okay. 184 00:11:19,390 --> 00:11:27,760 What I want to say here is let's say I am creating one motor vehicle vehicle pointer now this vehicle 185 00:11:27,870 --> 00:11:32,960 pointer is not pointing towards a vehicle it is pointing towards item then garbage location. 186 00:11:32,970 --> 00:11:37,350 And if we want to initialize this point that we can point it towards any vehicle for example we can 187 00:11:37,350 --> 00:11:43,510 write we do is we do is containing the address of we basically we do is pointing towards will. 188 00:11:44,310 --> 00:11:44,950 Okay. 189 00:11:45,060 --> 00:11:55,200 So what will happen when I write we do is so when I write we do is pointing towards we. 190 00:11:55,290 --> 00:11:59,310 So we do we do is the pointer and we Wednesday actually call object. 191 00:11:59,400 --> 00:12:02,920 So we do is pointing towards even okay. 192 00:12:03,000 --> 00:12:04,360 We can also. 193 00:12:04,380 --> 00:12:12,970 So what we can also do here is so let's come and get out so we do use a vehicle pointer but we can also 194 00:12:12,970 --> 00:12:14,580 do something like this. 195 00:12:14,830 --> 00:12:18,490 We do know points toward the car glass object. 196 00:12:18,530 --> 00:12:18,810 OK. 197 00:12:18,820 --> 00:12:20,940 We do this pointing towards the car glass object. 198 00:12:21,010 --> 00:12:26,890 So this is my God a glass object. 199 00:12:26,890 --> 00:12:31,980 See the name is C. And this is we call and this is the brain function. 200 00:12:31,990 --> 00:12:33,040 This is the brain function. 201 00:12:33,040 --> 00:12:33,550 OK. 202 00:12:33,730 --> 00:12:39,280 So what I did here is we do is now pointing towards the car glass object. 203 00:12:40,050 --> 00:12:40,320 OK. 204 00:12:40,330 --> 00:12:42,680 So this now this will be the scenario. 205 00:12:42,790 --> 00:12:43,300 OK. 206 00:12:43,450 --> 00:12:45,900 So if it is pointing towards the car glass object. 207 00:12:45,940 --> 00:12:48,120 So what we do is a basic glass pointer. 208 00:12:48,250 --> 00:12:55,180 So this is a basic glass pointer and see this is the right glass object. 209 00:12:55,240 --> 00:12:55,500 OK. 210 00:12:55,540 --> 00:12:57,850 So they raised the glass object. 211 00:12:58,360 --> 00:13:06,230 So what I want to say here is a basic glass point that can point to words are derived does object but 212 00:13:06,250 --> 00:13:07,750 divisive as that is not true. 213 00:13:07,860 --> 00:13:08,510 Okay. 214 00:13:08,560 --> 00:13:13,260 So when I write we do is pointing toward C.. 215 00:13:13,300 --> 00:13:14,430 So what is the meaning. 216 00:13:14,440 --> 00:13:17,440 So basically just pointer can point to it. 217 00:13:17,470 --> 00:13:20,600 Child the glass object but the vice versa is not allowed. 218 00:13:21,010 --> 00:13:24,220 Okay now I'm explaining the whole code again. 219 00:13:24,220 --> 00:13:27,480 Okay so what is the scenario. 220 00:13:27,720 --> 00:13:31,020 Okay so we call we first of all this line we call we. 221 00:13:31,020 --> 00:13:31,980 So what is the scenario. 222 00:13:32,010 --> 00:13:35,610 Let's say this is we call view object. 223 00:13:35,610 --> 00:13:40,790 This has brain function and let's say it addresses 300. 224 00:13:40,950 --> 00:13:41,830 Okay. 225 00:13:41,910 --> 00:13:49,870 Now Ghazi so it inherits from the working class so this is C object. 226 00:13:50,030 --> 00:13:51,020 This is V. 227 00:13:51,020 --> 00:13:55,520 This is the brain function and this is the brain function. 228 00:13:55,520 --> 00:13:55,810 Okay. 229 00:13:55,810 --> 00:14:00,150 And let's say that this is 400 view dot paint. 230 00:14:00,190 --> 00:14:04,510 Pseudo argument then I'm creating and then I'm creating the object dynamically. 231 00:14:04,530 --> 00:14:12,550 Okay so this is this is V1 and this is my dynamic object. 232 00:14:12,550 --> 00:14:13,740 This is what we call object. 233 00:14:14,490 --> 00:14:15,100 Okay. 234 00:14:15,290 --> 00:14:19,580 This we call object has print function and let's say it said this is hundred. 235 00:14:19,600 --> 00:14:21,050 So we even condensed hundred. 236 00:14:21,070 --> 00:14:22,750 And it is pointing. 237 00:14:22,750 --> 00:14:23,080 Okay. 238 00:14:23,110 --> 00:14:25,590 It is pointing towards this dynamic object. 239 00:14:25,750 --> 00:14:32,530 Then I created an added dynamic object so it is not a dynamic object. 240 00:14:32,540 --> 00:14:35,590 It's a point that only okay because last pointer. 241 00:14:35,750 --> 00:14:37,970 So let's say the name is we do. 242 00:14:37,970 --> 00:14:41,280 And then v2 is pointing towards that derived class object. 243 00:14:41,750 --> 00:14:43,670 So basically it said this is for it. 244 00:14:43,680 --> 00:14:45,710 So it will contain four rendered. 245 00:14:45,800 --> 00:14:47,810 And this is the scenario. 246 00:14:47,810 --> 00:14:48,040 Okay. 247 00:14:48,050 --> 00:14:50,500 So this is the complete scenario. 248 00:14:50,580 --> 00:14:56,570 Now what will happen if I try and if I try to write this code V2 arrow print. 249 00:14:57,770 --> 00:14:59,300 Okay so what will be the output. 250 00:14:59,900 --> 00:15:01,700 So when I write V to Arrow print. 251 00:15:02,300 --> 00:15:08,430 So we have two options either this print function will be called or this print function will be called. 252 00:15:08,540 --> 00:15:09,830 Now what will happen. 253 00:15:09,830 --> 00:15:14,610 So if I will write we want not print then it is very simple. 254 00:15:14,610 --> 00:15:21,310 So even out of print then it is very simple We only have one option that is this print function. 255 00:15:21,320 --> 00:15:25,220 Okay so this print function will get called but here we do at open. 256 00:15:25,280 --> 00:15:26,430 We have two options. 257 00:15:26,540 --> 00:15:28,970 This print and this print. 258 00:15:29,030 --> 00:15:30,040 And why does the scenario. 259 00:15:30,050 --> 00:15:34,190 Because a basic last point that is pointing towards are derived class object. 260 00:15:34,460 --> 00:15:38,420 So which print function will be called. 261 00:15:38,420 --> 00:15:38,680 Okay. 262 00:15:38,690 --> 00:15:39,570 So what do you think. 263 00:15:39,590 --> 00:15:41,380 Which print function will be called. 264 00:15:41,390 --> 00:15:48,530 So one thing that is important here whenever we do something like this we do is M percent of C.. 265 00:15:48,710 --> 00:15:51,340 So what happened is whenever we do something like this. 266 00:15:51,500 --> 00:15:57,800 This means so with the help of we do we can only access those properties that are present in the base 267 00:15:57,800 --> 00:15:59,200 class. 268 00:15:59,360 --> 00:16:00,200 Okay. 269 00:16:00,200 --> 00:16:05,510 Although we do as a base class point and it is pointing towards a derived class object but with the 270 00:16:05,510 --> 00:16:10,850 help of we do we can only access those properties that are present in the base class. 271 00:16:10,880 --> 00:16:14,050 So that means this print function will be called. 272 00:16:14,090 --> 00:16:17,520 Okay so this print function will be called Always remember this. 273 00:16:17,540 --> 00:16:23,450 Okay make it a point a base class pointer whenever a base class point is pointing towards or drive class 274 00:16:23,460 --> 00:16:24,090 object. 275 00:16:24,290 --> 00:16:29,720 And if you are using we do it to excess something then we can access only those properties that are 276 00:16:29,720 --> 00:16:31,130 present in the base class. 277 00:16:31,820 --> 00:16:32,310 Okay. 278 00:16:32,390 --> 00:16:34,610 Now listen this file. 279 00:16:34,610 --> 00:16:42,470 Okay so let's come on out this one and this one so we what we are doing here is I am calling the print 280 00:16:42,470 --> 00:16:53,660 function truly do Okay so I am writing here a note we can only access basic class properties properties 281 00:16:53,660 --> 00:16:55,500 that are present in the base class. 282 00:16:55,660 --> 00:16:55,940 Okay 283 00:16:58,870 --> 00:17:05,380 so that's way the output of this line will be this print function will get called output we biblical. 284 00:17:05,380 --> 00:17:10,650 Okay let's turn our file okay so this is trying I said it. 285 00:17:11,160 --> 00:17:13,610 Okay so the mistake is spelling mistake 286 00:17:16,940 --> 00:17:20,050 and similarly we did a spelling mistake okay. 287 00:17:20,220 --> 00:17:21,060 So now disconnect 288 00:17:24,670 --> 00:17:31,850 so the output is we call okay so we can only access only that we can access only those properties are 289 00:17:31,870 --> 00:17:33,750 not present in the base class. 290 00:17:33,820 --> 00:17:34,380 Okay. 291 00:17:34,510 --> 00:17:38,280 Now here it is the example of a compiled and polymorphism. 292 00:17:38,290 --> 00:17:44,020 Now why it is an example of compile time polymorphism so basically which function will be called We 293 00:17:44,020 --> 00:17:46,870 are taking that decision at the compile time only. 294 00:17:46,870 --> 00:17:47,120 Okay. 295 00:17:47,140 --> 00:17:48,970 So I am repeating myself. 296 00:17:48,970 --> 00:17:52,560 So when we write we do arrow print. 297 00:17:52,560 --> 00:17:55,890 So this is an example of compile time wildfire wisdom. 298 00:17:55,890 --> 00:18:01,110 Now why it is an example of compile time polymorphism because we are deciding at the compile time which 299 00:18:01,110 --> 00:18:02,320 function will be called. 300 00:18:02,400 --> 00:18:06,910 So we have two choices for the print function first in the Guard class print function and the second 301 00:18:06,910 --> 00:18:08,950 was that we could last print function. 302 00:18:09,030 --> 00:18:14,120 So we do first of all I don't care to whom we do is pointing. 303 00:18:14,130 --> 00:18:19,950 So we do is pointing towards the car glass the car glass derived basically derived object but I don't 304 00:18:19,950 --> 00:18:20,420 care. 305 00:18:20,470 --> 00:18:25,500 Okay so I don't care to only do it pointing since we do is a type of vehicle. 306 00:18:25,500 --> 00:18:28,910 So I will call only vehicle print function blandly. 307 00:18:29,030 --> 00:18:29,490 Okay. 308 00:18:29,640 --> 00:18:34,560 I will call you to print function vehicle print function blindly so we are deciding at the compile time 309 00:18:34,560 --> 00:18:36,450 only which function will be called. 310 00:18:36,480 --> 00:18:36,930 That's right. 311 00:18:36,930 --> 00:18:40,320 This is an example of compile time polymorphism. 312 00:18:40,340 --> 00:18:41,080 Okay. 313 00:18:41,220 --> 00:18:41,670 Thank you.