All language subtitles for 5. Challenge 3 - Calculate FACTORIAL!

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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,540 --> 00:00:08,100 So another day, another challenge, right, guys, in this challenge, we proceed with practicing functions. 2 00:00:08,520 --> 00:00:15,180 And the reason for that, for why I so much insist on practicing more and more exercises with functions, 3 00:00:15,390 --> 00:00:19,380 is because this topic is actually so important. 4 00:00:19,710 --> 00:00:23,130 And it will guide you during most of your programming career. 5 00:00:23,700 --> 00:00:26,480 So pay close attention and let's go. 6 00:00:26,730 --> 00:00:32,400 And what I want you to do in this challenge is simply to write a function that will receive a number 7 00:00:32,400 --> 00:00:33,750 of an integer type. 8 00:00:34,110 --> 00:00:37,490 And then the function is going to calculate its factorial. 9 00:00:37,650 --> 00:00:43,650 And just a quick reminder, for those of you who is not familiar with water, if Victoria really means 10 00:00:43,650 --> 00:00:50,520 and how it's calculated, the factorial of a given number is calculated by multiplying all the natural 11 00:00:50,520 --> 00:00:53,700 numbers from one up to the given number. 12 00:00:53,730 --> 00:01:01,440 So a factorial of NUM equals two one multiplied by two by three and so on up to the multiplication by 13 00:01:01,500 --> 00:01:02,010 NUM. 14 00:01:02,040 --> 00:01:02,440 All right. 15 00:01:02,460 --> 00:01:05,740 In this case, we specified D as M name equals to M. 16 00:01:05,940 --> 00:01:12,300 So for example, if you have a m to calculate the factorial of three equals two, one multiplied by 17 00:01:12,300 --> 00:01:16,680 two multiplied by three, which is a total of just six. 18 00:01:16,800 --> 00:01:23,370 And if you have to calculate the factorial of a number five, then you will say that eight equals two, 19 00:01:23,370 --> 00:01:30,120 one by two by three by four by five, which is a total of one hundred and twenty. 20 00:01:30,250 --> 00:01:30,720 Whoops. 21 00:01:30,900 --> 00:01:32,490 Here I have only six. 22 00:01:32,730 --> 00:01:36,000 That should be fixed to one hundred and twenty. 23 00:01:36,690 --> 00:01:40,410 So basically you've got the point hand and that's my mistake. 24 00:01:40,410 --> 00:01:41,340 I will fix it up. 25 00:01:41,400 --> 00:01:47,880 So basically you multiply all the numbers from one, two, three up to the specified number to find 26 00:01:47,970 --> 00:01:49,050 Edes factorial. 27 00:01:49,410 --> 00:01:52,140 And then the function is going to return. 28 00:01:52,170 --> 00:01:52,860 The result? 29 00:01:52,890 --> 00:01:56,300 It will calculate the factorial and return the result. 30 00:01:56,350 --> 00:01:59,690 And not printed to the screen, but rather it will return it. 31 00:01:59,880 --> 00:02:06,090 So there we can check with the main function that it actually works as we expected it to work. 32 00:02:06,360 --> 00:02:10,410 And that will basically bid for these function. 33 00:02:10,410 --> 00:02:18,150 And one thing that I would like you to notice is that if then if a given number is going to be a negative 34 00:02:18,150 --> 00:02:26,310 number, then the function will return minus one, because we cannot calculate a factorial for a negative 35 00:02:26,310 --> 00:02:26,880 number. 36 00:02:27,000 --> 00:02:31,440 And these minus one will specify that something something was wrong there. 37 00:02:31,950 --> 00:02:36,000 And we will know how to treat it later on. 38 00:02:36,150 --> 00:02:37,440 So good luck, guys. 39 00:02:37,490 --> 00:02:40,350 Give it a try and I'll see you in the next video. 3748

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