1 00:00:02,580 --> 00:00:04,350 Hey, guys, what's up? 2 00:00:04,890 --> 00:00:09,030 So in this video, we will learn a new concept called By Value. 3 00:00:10,980 --> 00:00:13,920 So it is very important, so pay attention. 4 00:00:15,130 --> 00:00:18,250 So we'll try to understand this concept with the help of an example. 5 00:00:18,820 --> 00:00:22,690 So suppose my question is right to function. 6 00:00:23,500 --> 00:00:24,790 We have to write a function. 7 00:00:26,010 --> 00:00:28,800 To slap two numbers. 8 00:00:31,290 --> 00:00:35,310 OK, so our aim is to write a function to slap two numbers. 9 00:00:36,510 --> 00:00:37,590 So let us write the code. 10 00:00:38,130 --> 00:00:38,670 So. 11 00:00:39,800 --> 00:00:45,210 Void that isn't able to function will be void because it is not going to return anything. 12 00:00:45,930 --> 00:00:48,080 Let's say the name of the function is my SEP. 13 00:00:49,880 --> 00:00:52,670 And I am digging to numbers as input. 14 00:00:54,960 --> 00:01:04,650 And how does that two numbers, so them, because A equals B and B equals temp. 15 00:01:07,330 --> 00:01:07,590 OK. 16 00:01:07,760 --> 00:01:15,380 So they we lose the slabbed and let's say I'm calling this function from mean, so Intiman led to the 17 00:01:15,380 --> 00:01:20,000 value of is five and the value of B is seven. 18 00:01:20,780 --> 00:01:22,880 And I'm calling function my step. 19 00:01:23,000 --> 00:01:25,070 So my SPREP. 20 00:01:27,890 --> 00:01:29,370 A and B is input. 21 00:01:30,270 --> 00:01:34,410 Now let us burn the valley off A and B. 22 00:01:36,790 --> 00:01:37,840 So what do you think? 23 00:01:38,020 --> 00:01:39,050 Where do live my output? 24 00:01:40,750 --> 00:01:41,920 So I believe it should happen. 25 00:01:41,980 --> 00:01:44,260 The value of NDB should be swept. 26 00:01:44,860 --> 00:01:49,780 So if the value of is five, the new video feature becomes seven. 27 00:01:50,110 --> 00:01:57,010 If the value of BES seven, the new value of B should become five so badly, they should be more output. 28 00:01:58,690 --> 00:02:01,950 Now, let's see what will be my output. 29 00:02:04,120 --> 00:02:06,790 So I am naming this file as called by value. 30 00:02:25,540 --> 00:02:29,510 Now, let's say that doing a Mozart and a quiz. 31 00:02:29,580 --> 00:02:35,800 So An and and B equals five. 32 00:02:36,460 --> 00:02:38,200 So these are the two numbers. 33 00:02:39,130 --> 00:02:41,830 And let's to the name of the function is my step. 34 00:02:43,960 --> 00:02:46,960 And I will give A and B as input. 35 00:02:48,550 --> 00:02:48,850 OK. 36 00:02:50,050 --> 00:02:52,370 Now let us write code for swapping. 37 00:02:53,350 --> 00:02:56,500 So avoid my ASVAB. 38 00:02:59,520 --> 00:03:06,750 It will take two numbers as input and then we will write those three magical lines. 39 00:03:07,600 --> 00:03:13,800 So and --, because A A equals B. 40 00:03:15,970 --> 00:03:18,160 And B equals temp. 41 00:03:19,300 --> 00:03:25,330 So with the help of these three magical lines, the village of NDB will be swept. 42 00:03:26,410 --> 00:03:26,700 OK. 43 00:03:27,280 --> 00:03:29,690 So let us try to bend the values of NDB. 44 00:03:30,520 --> 00:03:32,410 So before swapping C out. 45 00:03:34,420 --> 00:03:36,700 Before stepping. 46 00:03:39,060 --> 00:03:43,460 So before slapping the value of let's spend the value of NDB. 47 00:03:51,960 --> 00:03:54,960 And also, let us rent the video, Flanby after sipping. 48 00:03:59,950 --> 00:04:01,420 So after sipping. 49 00:04:04,900 --> 00:04:06,610 So this is my entire record. 50 00:04:07,750 --> 00:04:09,250 Let's see where the live output. 51 00:04:12,440 --> 00:04:13,360 Before Sepi. 52 00:04:13,460 --> 00:04:13,950 OK. 53 00:04:35,450 --> 00:04:37,640 So before supping, we lose our seven and five. 54 00:04:37,670 --> 00:04:41,270 And after sipping again, the values are seven and five. 55 00:04:41,750 --> 00:04:44,480 So the values are not getting swept. 56 00:04:46,920 --> 00:04:53,200 Now, let us spend here the values of sources out in function. 57 00:04:56,640 --> 00:04:58,680 Now in a desert in the valley of a be here. 58 00:04:58,890 --> 00:05:01,020 And let's see where the values are getting Sabga. 59 00:05:01,060 --> 00:05:02,910 Not so easy out. 60 00:05:11,680 --> 00:05:18,620 And similarly, let us also, Brent, before stepping so. 61 00:05:28,250 --> 00:05:33,250 So in function, let's call it before before stepping. 62 00:05:33,350 --> 00:05:33,660 OK? 63 00:05:34,580 --> 00:05:36,380 And let's call it after stepping. 64 00:05:37,880 --> 00:05:42,760 So let's see whether my whether there is an issue with Mizer function or not. 65 00:05:46,880 --> 00:05:50,060 So before stepping so in faith, these were the initial values here. 66 00:05:50,660 --> 00:05:51,800 Now I'm in function. 67 00:05:52,250 --> 00:05:56,840 So before stepping the religion, so in fact, the seven and five correct after seven, that we lose 68 00:05:56,840 --> 00:05:57,830 our faith in seven. 69 00:05:58,400 --> 00:06:01,670 Then how these values become seven and five. 70 00:06:01,730 --> 00:06:04,010 As soon as I add each mean function. 71 00:06:05,330 --> 00:06:06,220 So justice again. 72 00:06:06,350 --> 00:06:08,080 Let's sprint real loose correctly. 73 00:06:08,540 --> 00:06:18,200 So before stepping in men in main function and after stepping in main function. 74 00:06:18,890 --> 00:06:19,760 Now let's see again. 75 00:06:22,370 --> 00:06:28,040 So before stepping in main function, the values are seven and five in function before slipping the 76 00:06:28,070 --> 00:06:28,370 values. 77 00:06:28,460 --> 00:06:29,590 So in five, correct. 78 00:06:30,020 --> 00:06:32,120 After stepping, will this become five and seven? 79 00:06:32,480 --> 00:06:38,660 But as soon as I reach function, mean the values become seven and five again. 80 00:06:39,740 --> 00:06:43,380 So basically there is no effect of stepping back by. 81 00:06:46,120 --> 00:06:48,070 So let me show you how it is happening. 82 00:06:56,400 --> 00:06:56,820 So. 83 00:06:58,380 --> 00:07:00,530 I am calling this function myself. 84 00:07:01,150 --> 00:07:02,590 So in main function. 85 00:07:04,790 --> 00:07:09,530 This is A this is B, where does the real of A seven? 86 00:07:09,590 --> 00:07:11,630 What is the value of B five? 87 00:07:12,110 --> 00:07:17,330 Then I told you that this A and this A, they both are different. 88 00:07:17,750 --> 00:07:23,240 So since they are different, they will be allocated different memory and the values are getting copied 89 00:07:23,540 --> 00:07:25,640 the way Leo Fey is getting copied. 90 00:07:26,120 --> 00:07:27,610 So a seven a. 91 00:07:30,560 --> 00:07:36,260 Similarly, this bee and this bee, they are different, only their values are getting copied. 92 00:07:37,560 --> 00:07:42,000 So five, now I am doing these kinds of stuff. 93 00:07:42,360 --> 00:07:44,030 Now this is the main part swapping. 94 00:07:44,430 --> 00:07:45,270 So what will happen? 95 00:07:45,330 --> 00:07:47,250 I will take a variable temp. 96 00:07:49,010 --> 00:07:50,390 And sipping, will they please? 97 00:07:51,800 --> 00:07:54,230 OK, so slapping will take place. 98 00:07:54,620 --> 00:07:58,520 The new belly of the new well, your fee will become five. 99 00:07:59,000 --> 00:07:59,870 And the value of. 100 00:07:59,950 --> 00:08:00,740 So this is Gosbee. 101 00:08:01,070 --> 00:08:03,440 So the value of B will become seven. 102 00:08:04,910 --> 00:08:08,840 So the values are getting swept and now I am printing the new values. 103 00:08:09,330 --> 00:08:11,500 So five and seven will get printed. 104 00:08:11,520 --> 00:08:13,260 Initial the value was seven and five. 105 00:08:13,680 --> 00:08:14,540 So this is correct. 106 00:08:16,380 --> 00:08:19,860 Now, at this point of time, this function and. 107 00:08:21,010 --> 00:08:27,400 Since this function and this whole thing goes, this whole thing is popped out of the stack. 108 00:08:27,970 --> 00:08:28,730 If you remember. 109 00:08:29,080 --> 00:08:31,630 So this whole thing is popped out of the stack. 110 00:08:32,050 --> 00:08:38,470 I will reach at this line after swiping the values of A and B are again, seven and five. 111 00:08:38,910 --> 00:08:44,260 So there is no effect of all this on the values of A and B.. 112 00:08:44,350 --> 00:08:46,500 So my step function is wrong. 113 00:08:49,250 --> 00:08:54,290 OK, so this thing is called gold by value, you call by value. 114 00:08:56,320 --> 00:09:00,550 And the name is justified because we are just giving the values. 115 00:09:01,540 --> 00:09:03,520 We are just passing on the values. 116 00:09:03,580 --> 00:09:04,060 Seven. 117 00:09:04,450 --> 00:09:08,230 And similarly, we are just calling the function by values. 118 00:09:08,320 --> 00:09:09,670 We are giving values. 119 00:09:10,330 --> 00:09:10,560 OK. 120 00:09:10,840 --> 00:09:15,130 So here I was giving seven value and I was giving five value. 121 00:09:15,610 --> 00:09:18,670 So we are calling the function by value. 122 00:09:21,580 --> 00:09:23,620 Now, how we can correct our approach. 123 00:09:25,180 --> 00:09:26,680 So how to solve this problem? 124 00:09:28,270 --> 00:09:29,360 I want to do swapping. 125 00:09:29,860 --> 00:09:35,020 So how against all this problem, this we will see in the next video. 126 00:09:35,740 --> 00:09:36,070 OK. 127 00:09:36,340 --> 00:09:36,850 Thank you.