1 00:00:01,390 --> 00:00:03,010 Hey, guys, what's up? 2 00:00:03,490 --> 00:00:06,580 So today we are going to solve one more interesting problem. 3 00:00:07,030 --> 00:00:18,490 So the problem statement is given in it was it will give us and and we have to find some of even numbers. 4 00:00:22,160 --> 00:00:29,180 From one to and so you it will give us the value of N. 5 00:00:29,240 --> 00:00:36,290 And we have to find the sum of even numbers starting from one billion, for example, and equals five. 6 00:00:36,440 --> 00:00:44,330 So even numbers are two plus for some output should be six for enclose five mild butchered B6. 7 00:00:45,020 --> 00:00:47,220 Similarly to the value of N is eight. 8 00:00:47,720 --> 00:00:55,420 So output should be two plus four plus six plus eight, which is 20. 9 00:00:55,520 --> 00:00:57,380 So output should be 20. 10 00:00:58,700 --> 00:00:58,940 OK. 11 00:00:59,510 --> 00:01:02,750 And similarly, let's say the value of an is three. 12 00:01:03,170 --> 00:01:05,300 So now it will be to. 13 00:01:06,560 --> 00:01:13,170 OK, so if you remember, we have already solved this problem in flowcharts, in pseudocode. 14 00:01:13,940 --> 00:01:16,130 But today we will be writing the actual code. 15 00:01:17,220 --> 00:01:20,360 Okay, so how we can solve this problem. 16 00:01:22,250 --> 00:01:27,900 So first of all, what I will do, I will take no scene and as in. 17 00:01:29,180 --> 00:01:29,420 OK. 18 00:01:29,870 --> 00:01:34,100 So for finding the sum what I need, I need a loop. 19 00:01:34,190 --> 00:01:35,300 I need a variable. 20 00:01:35,660 --> 00:01:37,230 Let's call it some. 21 00:01:38,300 --> 00:01:44,620 And we will add the values to the some of the variable some. 22 00:01:45,590 --> 00:01:49,250 So I need a loop and this loop will start from two. 23 00:01:49,730 --> 00:01:50,890 So I need a loop. 24 00:01:51,980 --> 00:01:56,380 And this loop will start from two three. 25 00:01:56,750 --> 00:01:59,440 I is less than ordered close to N. 26 00:02:01,280 --> 00:02:05,450 And each time what I will do I will add the value of. 27 00:02:05,840 --> 00:02:08,000 I do my variable some. 28 00:02:09,510 --> 00:02:12,900 And here I equals a plus two. 29 00:02:13,440 --> 00:02:18,240 So why I am incrementing by two, because we have to consider even numbers. 30 00:02:18,630 --> 00:02:20,400 And the first even number is two. 31 00:02:21,420 --> 00:02:22,800 So the first two numbers two. 32 00:02:22,880 --> 00:02:25,650 And that's why I initialised I equals two. 33 00:02:26,040 --> 00:02:29,430 And since we have to go see this, we have to consider only even numbers. 34 00:02:30,090 --> 00:02:32,730 So I will increase the value of Ibai to. 35 00:02:33,880 --> 00:02:40,480 OK, so after running this look, my variable sum will be containing my answer and I will print some 36 00:02:40,480 --> 00:02:41,920 here, see out some. 37 00:02:42,430 --> 00:02:44,260 So this is all that we have to do. 38 00:02:44,980 --> 00:02:46,650 So first, let us write code. 39 00:02:50,490 --> 00:02:52,490 So let us name this file as. 40 00:02:56,120 --> 00:03:00,560 Some of even Nazi BP. 41 00:03:18,200 --> 00:03:26,210 Now, what I have to do, first of all, I will take a variable in and I will take and as input from 42 00:03:26,210 --> 00:03:27,210 the user. 43 00:03:29,210 --> 00:03:33,230 So I need a variable sum which will hold my answer. 44 00:03:34,550 --> 00:03:42,140 So I need a loop which will start from two do, because two is the first even number. 45 00:03:42,650 --> 00:03:48,350 And this loop will run while I is less than ordered close to end. 46 00:03:49,100 --> 00:03:56,210 And each time this loop is learning what I have to do, I have to add the current even number to my 47 00:03:56,210 --> 00:03:57,320 variable sum. 48 00:03:57,380 --> 00:04:02,480 So some equals some plus I and I have to go to next even number. 49 00:04:03,080 --> 00:04:08,510 So next year when number can be obtained by adding two to my current given number. 50 00:04:09,890 --> 00:04:11,270 So this is all that we have to do. 51 00:04:11,870 --> 00:04:16,310 And then I will print some which is holding my answer. 52 00:04:17,300 --> 00:04:17,470 OK. 53 00:04:17,540 --> 00:04:19,490 So this is all that we have to do. 54 00:04:20,510 --> 00:04:22,210 What the output will be wrong. 55 00:04:23,550 --> 00:04:23,780 Why? 56 00:04:24,260 --> 00:04:24,790 Let's see. 57 00:04:29,440 --> 00:04:31,370 So let's say the value of any is three. 58 00:04:31,450 --> 00:04:36,970 So our purchase, we do so Oddworld is coming out to be a very strange number. 59 00:04:38,190 --> 00:04:38,370 OK. 60 00:04:38,530 --> 00:04:39,190 So let's see. 61 00:04:39,550 --> 00:04:43,820 Let's bring it on our program and let's see what went wrong. 62 00:04:48,060 --> 00:04:50,730 So the value of and is three. 63 00:04:51,560 --> 00:04:51,750 OK. 64 00:04:51,930 --> 00:04:53,640 So the first event number is two. 65 00:04:54,090 --> 00:04:59,220 So I equals two ISBN initialised way to him because two is the first event number. 66 00:04:59,790 --> 00:05:04,380 And this loop will run till I is less than articles two. 67 00:05:04,800 --> 00:05:09,520 And so if I start watching, this condition is two less than articles two three. 68 00:05:10,590 --> 00:05:12,700 So is two less than articles today. 69 00:05:12,750 --> 00:05:13,770 So the condition is true. 70 00:05:13,860 --> 00:05:15,340 I will go inside the loop. 71 00:05:15,930 --> 00:05:19,920 So I will add the current even number for my variable sum. 72 00:05:20,790 --> 00:05:29,100 So some equals current value of some plus current even number, which is to. 73 00:05:30,250 --> 00:05:34,900 But what happened here is what is the value of getting some? 74 00:05:36,730 --> 00:05:41,380 So I don't know if you remember when we had it, when we arrived in sum. 75 00:05:43,150 --> 00:05:51,280 So what will happen this some variable will be given for bites of memory and the name of these four 76 00:05:51,280 --> 00:05:52,150 bites out of some. 77 00:05:53,600 --> 00:05:55,240 OK, so we are not right. 78 00:05:55,330 --> 00:05:56,740 So we are not writing anything here. 79 00:05:56,800 --> 00:06:01,030 So by default, there is a combination of zero one zero zero one zero and so on. 80 00:06:01,600 --> 00:06:03,730 So this really is called garbage value. 81 00:06:06,450 --> 00:06:07,280 Garbage value. 82 00:06:07,960 --> 00:06:08,650 So is my son. 83 00:06:08,650 --> 00:06:11,140 Variable is containing garbage value. 84 00:06:12,040 --> 00:06:13,840 And it should have contain zero. 85 00:06:15,490 --> 00:06:16,300 So let me show you. 86 00:06:17,470 --> 00:06:18,550 So here I am. 87 00:06:18,550 --> 00:06:20,440 Printing led to the value of some. 88 00:06:21,130 --> 00:06:22,600 So I am printing some here. 89 00:06:27,860 --> 00:06:29,030 And it's commented out. 90 00:06:32,680 --> 00:06:34,510 Led to the value of and these two. 91 00:06:35,330 --> 00:06:40,830 So this is the valley of some Myozyme is containing any random number. 92 00:06:41,180 --> 00:06:45,440 And this number is called garbage because it is of no use to us. 93 00:06:46,690 --> 00:06:47,770 So what we should do? 94 00:06:50,240 --> 00:06:54,600 We have created the variable sum we have to initialize, initialize it with zero. 95 00:06:55,440 --> 00:06:58,500 OK, so initially my sum is zero. 96 00:06:59,790 --> 00:07:01,590 And now our code is hundred percent. 97 00:07:01,680 --> 00:07:02,100 Correct. 98 00:07:02,190 --> 00:07:02,810 So let's see. 99 00:07:05,820 --> 00:07:09,590 So let's turn our program low to the value of amnesty. 100 00:07:09,630 --> 00:07:12,390 So our budget we do, which is hundred percent correct. 101 00:07:14,760 --> 00:07:18,550 Four and equals five, six, four, eight, 20. 102 00:07:18,990 --> 00:07:20,460 So five and eight. 103 00:07:20,640 --> 00:07:24,470 OK, so friend equals five. 104 00:07:24,830 --> 00:07:26,130 My output is six. 105 00:07:28,990 --> 00:07:31,920 And for any equals, eight wild four days. 106 00:07:32,140 --> 00:07:33,410 Don't be so recorders. 107 00:07:33,460 --> 00:07:35,200 Hundred percent correct. 108 00:07:35,620 --> 00:07:37,840 But let's see how it works. 109 00:07:40,220 --> 00:07:41,900 So our goal is very simple. 110 00:07:43,360 --> 00:07:49,820 And I'm taking a variable sum, which is initialized to zero because initially the sum will be zero. 111 00:07:50,420 --> 00:07:52,840 And my first event number is two. 112 00:07:53,720 --> 00:08:04,160 And this loop is will be running while I is less than or equal to N and each time I will add the current 113 00:08:04,160 --> 00:08:04,550 sum. 114 00:08:05,420 --> 00:08:06,560 The current even number. 115 00:08:06,590 --> 00:08:11,060 So I is containing current even number. 116 00:08:12,320 --> 00:08:18,530 I is containing currently one number and I am adding that current event number to my variable sum. 117 00:08:20,060 --> 00:08:20,240 OK. 118 00:08:20,390 --> 00:08:22,380 Now I have to go to next event number. 119 00:08:22,940 --> 00:08:28,340 So for going to next event number, I will add two to my current division number. 120 00:08:29,150 --> 00:08:36,010 And finally, when this loop will terminate, my answer will be stored in my variable sum. 121 00:08:36,140 --> 00:08:38,030 So this is the whole code. 122 00:08:39,230 --> 00:08:42,030 Now, let us test our program for any quiz. 123 00:08:42,440 --> 00:08:43,220 Let's say five. 124 00:08:44,780 --> 00:08:46,760 So initially, the value of PHI is two. 125 00:08:47,360 --> 00:08:49,880 And initially my sum is zero. 126 00:08:50,600 --> 00:08:51,620 So check the condition. 127 00:08:51,980 --> 00:08:55,280 So is to list then or close to five. 128 00:08:55,340 --> 00:08:58,160 Yes, the condition is true and I do the same. 129 00:08:58,610 --> 00:09:02,840 So sum, it was all value of sum, which is zero plus two. 130 00:09:03,470 --> 00:09:06,670 So some equations do now increase the value of Highway two. 131 00:09:07,280 --> 00:09:10,360 So a new value of EI is for this next to number. 132 00:09:11,030 --> 00:09:12,390 And my sum is two. 133 00:09:13,160 --> 00:09:14,540 So check the condition. 134 00:09:15,530 --> 00:09:17,610 So is it for less than articles two? 135 00:09:17,660 --> 00:09:20,690 Five is food listin or close to five. 136 00:09:21,080 --> 00:09:22,370 Yes, the condition is true. 137 00:09:23,180 --> 00:09:24,840 So sum it goes oil away. 138 00:09:24,860 --> 00:09:30,110 Leave some which is two plus I, which is for the sum equals six. 139 00:09:30,950 --> 00:09:34,400 Now inglese the value of EI noticeable next to a number. 140 00:09:34,430 --> 00:09:38,750 So I equals six and my sum is containing six year. 141 00:09:42,240 --> 00:09:43,780 Now, check the condition again. 142 00:09:44,910 --> 00:09:47,970 So is six less than or close to five? 143 00:09:48,940 --> 00:09:49,090 No. 144 00:09:49,400 --> 00:09:53,130 The condition is false, since the condition is false. 145 00:09:53,220 --> 00:09:53,680 I will. 146 00:09:53,760 --> 00:09:59,850 This loop will get terminated and I will reach at this point and I am printing some. 147 00:10:00,360 --> 00:10:07,830 So I am printing six, which is correct answer because two plus four equals six for N equals five. 148 00:10:08,610 --> 00:10:11,640 So this is how our code is working. 149 00:10:12,300 --> 00:10:19,590 So the thing that we have done is called Dryden Diren means you're on your code manually on pen and 150 00:10:19,590 --> 00:10:24,510 paper to see how things are working to get a better understanding of your code. 151 00:10:25,730 --> 00:10:32,420 So what changes can we do here is so we can also write like this? 152 00:10:33,900 --> 00:10:41,290 Instead of writing some, it simply say we can write some blows equals a. they both are the same. 153 00:10:42,210 --> 00:10:48,260 Similarly, instead of writing a class, I pledge to I can write a blessed equals two. 154 00:10:49,530 --> 00:10:51,180 I'll get to the meaning will remain the same. 155 00:10:51,330 --> 00:10:54,450 This is just another way in which we can write. 156 00:10:57,280 --> 00:11:00,680 Now to the value of these five, some outproduce six. 157 00:11:02,310 --> 00:11:15,590 OK, so what I told you, you can write like some it, some place I or some classic close eye. 158 00:11:15,810 --> 00:11:16,980 They both are same. 159 00:11:17,540 --> 00:11:22,470 Similarly I was a plus two or I plus equals two. 160 00:11:22,560 --> 00:11:24,250 They both seem similarly. 161 00:11:24,750 --> 00:11:30,800 I was I you multiply by two or I might reply equals two. 162 00:11:30,880 --> 00:11:31,730 They were without him. 163 00:11:32,480 --> 00:11:39,720 Similarly I equals I two and I they will die same. 164 00:11:39,740 --> 00:11:46,710 Similarly and let's say I equals I multiply by seven so I multiply equals seven. 165 00:11:46,770 --> 00:11:49,070 So do the same. 166 00:11:49,500 --> 00:11:52,770 OK, this is just our way of writing. 167 00:11:53,330 --> 00:11:53,540 Okay. 168 00:11:53,620 --> 00:11:54,810 It doesn't make any difference. 169 00:11:55,110 --> 00:11:57,450 It is just a way of writing. 170 00:11:59,530 --> 00:12:03,580 OK, so the code was pretty simple and easy. 171 00:12:04,450 --> 00:12:05,980 So I hope you understood this problem. 172 00:12:06,010 --> 00:12:09,040 So if you have any doubt, feel free to ask. 173 00:12:09,440 --> 00:12:09,690 OK. 174 00:12:10,270 --> 00:12:12,040 So that is all for this video. 175 00:12:12,220 --> 00:12:12,700 Thank you.