All language subtitles for 130 Leap Year Solution.en_US

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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,090 --> 00:00:02,570 All right so let's try to tackle this challenge. 2 00:00:02,610 --> 00:00:03,990 Step by step. 3 00:00:03,990 --> 00:00:10,850 Now if we look at the flow chart the first question we ask is Is it cleanly divisible by four. 4 00:00:10,860 --> 00:00:13,470 If no then it's definitely not a leap year. 5 00:00:13,470 --> 00:00:16,340 If yes then we have to ask more questions. 6 00:00:16,410 --> 00:00:19,110 So how would we write this in terms of code. 7 00:00:19,650 --> 00:00:27,390 Well we'd probably use an if statement to check if the year that were being passed in here is cleanly 8 00:00:27,390 --> 00:00:28,600 divisible by four. 9 00:00:29,220 --> 00:00:35,250 And remember that on a previous lesson which I linked to here we learned about the modulo operator which 10 00:00:35,250 --> 00:00:37,680 gives you the remainder of a division. 11 00:00:37,680 --> 00:00:46,260 So if the year modulo four is equal to zero namely if there is no remainder when you divide the year 12 00:00:46,260 --> 00:00:47,320 by four. 13 00:00:47,330 --> 00:00:50,130 Well in that case then it's likely to be a leap year. 14 00:00:50,700 --> 00:00:56,790 But if it's not even divisible by four then it's definitely not a leap year. 15 00:00:56,790 --> 00:01:00,540 So here we could simply return not leap year. 16 00:01:01,140 --> 00:01:03,350 So any year that is not divisible by four. 17 00:01:03,360 --> 00:01:09,750 That is definitely not a leap year but if it is divisible by four we still have to check is it cleanly 18 00:01:09,750 --> 00:01:11,860 divisible by 100. 19 00:01:12,030 --> 00:01:14,700 Because if no then it's definitely a leap year. 20 00:01:15,000 --> 00:01:17,670 But if yes then we have to check further. 21 00:01:17,670 --> 00:01:24,240 So the best way to represent that logic is to create another if statement inside this if statement. 22 00:01:24,260 --> 00:01:26,320 So it's already divisible by four. 23 00:01:26,460 --> 00:01:29,720 But we have to check whether if it's divisible by 100. 24 00:01:29,790 --> 00:01:38,010 So if the year modulo 100 is equal to zero Well then we have to make some further checks. 25 00:01:38,100 --> 00:01:42,120 But if it's not then it's definitely a leap year. 26 00:01:42,150 --> 00:01:45,250 So we can return leap year. 27 00:01:45,270 --> 00:01:51,210 Now finally we're in the homestretch and we have to ask ourselves the last question is it cleanly divisible 28 00:01:51,210 --> 00:01:52,710 by 400. 29 00:01:52,740 --> 00:01:54,600 If no then it's not a leap year. 30 00:01:54,600 --> 00:01:56,320 If yes then it is a leap year. 31 00:01:56,820 --> 00:02:04,470 So inside this if statement we're going to ask ourselves one further question if the year is divisible 32 00:02:04,470 --> 00:02:06,240 by 400. 33 00:02:06,480 --> 00:02:08,250 And that has no remainder. 34 00:02:08,580 --> 00:02:11,120 Well then it's definitely a leap year. 35 00:02:11,160 --> 00:02:16,960 And if that's not true then it's definitely not a leap year. 36 00:02:17,060 --> 00:02:25,340 So this is the logic that we saw in the flowchart mapped out with javascript code and going from these 37 00:02:25,340 --> 00:02:28,360 words to code is actually quite a big jump. 38 00:02:28,730 --> 00:02:35,930 But going via that middle ground that flowchart makes it so much easier to actually map out the logic 39 00:02:36,260 --> 00:02:38,610 and then converting it into code. 40 00:02:38,630 --> 00:02:43,220 So hope you enjoy that challenge and you managed to get it right and at least if you didn't you saw 41 00:02:43,220 --> 00:02:50,480 how you can use flow charts to simplify and clarify your own idea of the logic because at the end of 42 00:02:50,480 --> 00:02:52,190 the day the code is easy. 43 00:02:52,280 --> 00:02:55,020 But the logic is the path that you've got to get right first. 44 00:02:55,190 --> 00:02:59,480 So now if we check our solution then everything should pass. 3992

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