All language subtitles for 6. Challenge 3 - Solution

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These are the user uploaded subtitles that are being translated: 1 00:00:00,240 --> 00:00:02,820 So let's start with the solutions right away. 2 00:00:03,390 --> 00:00:08,610 First of all, what I want you to do is to specify the function type, and we know that a multiplication 3 00:00:08,610 --> 00:00:11,640 of the jurors will be equal to integers. 4 00:00:11,720 --> 00:00:14,690 So the function is going to return an integer type. 5 00:00:14,730 --> 00:00:16,610 So we just specify end. 6 00:00:17,190 --> 00:00:20,460 And now we specify the function name in these cases. 7 00:00:20,460 --> 00:00:22,000 Factorial four. 8 00:00:22,320 --> 00:00:24,390 Sorry about that factorial. 9 00:00:24,510 --> 00:00:27,220 And we know that a functional receives a number. 10 00:00:27,240 --> 00:00:28,590 So int num. 11 00:00:29,430 --> 00:00:33,240 Now we are going to specify the functions body and in the functions body. 12 00:00:33,240 --> 00:00:37,500 We are going to first of all, to make sure that the number is not negative. 13 00:00:37,530 --> 00:00:42,510 So if it is less, if NARM is less than zero. 14 00:00:42,590 --> 00:00:45,900 And in this case the function is going to return minus one. 15 00:00:45,900 --> 00:00:46,170 Right. 16 00:00:46,240 --> 00:00:52,850 That what we agreed on, that the function is going to return minus one if the number is less than zero 17 00:00:52,860 --> 00:00:55,600 and we can not calculate the factorial for it. 18 00:00:55,770 --> 00:01:00,090 So otherwise otherwise if that's not happening. 19 00:01:00,180 --> 00:01:00,420 Right. 20 00:01:00,450 --> 00:01:02,140 We do not need to. 21 00:01:02,190 --> 00:01:05,130 We are not required to use the yellow section here. 22 00:01:05,130 --> 00:01:07,380 We can just proceed with our code. 23 00:01:07,410 --> 00:01:14,010 Because if this line if this condition happened to be true, then we will simply return the result and 24 00:01:14,010 --> 00:01:17,310 we will not continue running the next lines of code. 25 00:01:17,370 --> 00:01:20,250 So there is no need for the yellow section here. 26 00:01:20,840 --> 00:01:25,220 Now, what we are going to do is to probably use some loop, right? 27 00:01:25,260 --> 00:01:26,700 We are going to use some loop. 28 00:01:27,060 --> 00:01:30,210 And I want us to use a loop. 29 00:01:30,360 --> 00:01:31,500 Let's use a for loop. 30 00:01:31,530 --> 00:01:39,690 So in it, I will create an IV variable and then we are going to specify the slope. 31 00:01:39,720 --> 00:01:45,220 So for I equals two one as long as I is less or equal to none. 32 00:01:45,270 --> 00:01:45,510 Right. 33 00:01:45,540 --> 00:01:51,780 Because we are going to multiply by I want every duration and I plus plus. 34 00:01:51,990 --> 00:02:01,080 And now what we are going to do is to multiply on each iteration, the number we have so far multiplied 35 00:02:01,080 --> 00:02:02,060 by I. 36 00:02:02,160 --> 00:02:04,290 So it will be one multiplied by two. 37 00:02:04,290 --> 00:02:04,980 By three. 38 00:02:05,070 --> 00:02:06,840 Until we reach these numbers. 39 00:02:06,990 --> 00:02:14,370 So for that what we also need, we need to create a in some some variable that will store the result. 40 00:02:14,490 --> 00:02:17,700 And let's call this variable been resolved. 41 00:02:18,300 --> 00:02:18,570 Okay. 42 00:02:18,630 --> 00:02:21,240 So the result will hold the result. 43 00:02:21,390 --> 00:02:24,930 The result of the factorial factorial. 44 00:02:25,680 --> 00:02:27,320 And now will also. 45 00:02:27,390 --> 00:02:28,490 What what should we do. 46 00:02:28,500 --> 00:02:31,090 Well, so we should specify some. 47 00:02:31,390 --> 00:02:35,130 We will we should initialize that these variable to be let's say one. 48 00:02:35,420 --> 00:02:35,760 Okay. 49 00:02:35,970 --> 00:02:38,940 This variable will be one end of every duration. 50 00:02:39,330 --> 00:02:41,760 We are going to multiply it by I. 51 00:02:42,120 --> 00:02:47,100 So result equals to the previous result multiplied by I. 52 00:02:47,670 --> 00:02:51,100 So on the first iteration we will have resolved. 53 00:02:51,390 --> 00:02:55,470 Equals to previous result which is one multiplied by one. 54 00:02:55,500 --> 00:02:55,920 All right. 55 00:02:56,010 --> 00:02:59,700 This operation may be actually unnecessary. 56 00:03:00,720 --> 00:03:01,440 In this case. 57 00:03:01,470 --> 00:03:02,760 But we'll leave it this way. 58 00:03:02,790 --> 00:03:05,710 So result equals the result multiplied by I. 59 00:03:06,150 --> 00:03:09,420 And on the next iteration it will be equal to one. 60 00:03:09,420 --> 00:03:10,830 Multiplied by two. 61 00:03:10,860 --> 00:03:11,130 Right. 62 00:03:11,160 --> 00:03:13,470 Because I is going to be equal to two. 63 00:03:13,530 --> 00:03:14,810 We incremented it here. 64 00:03:14,910 --> 00:03:19,980 And on the 30th duration, we will have previous result, which is two multiplied by three. 65 00:03:20,010 --> 00:03:21,450 And so on and so forth. 66 00:03:21,690 --> 00:03:25,620 And that's how you calculate the result in C programming language. 67 00:03:25,740 --> 00:03:32,940 And once you've calculated the result of the factorial of these number, you are going to return it. 68 00:03:33,210 --> 00:03:33,480 Right. 69 00:03:33,510 --> 00:03:35,580 So return result. 70 00:03:35,980 --> 00:03:37,050 And that's it. 71 00:03:37,200 --> 00:03:40,860 That's how you calculate the factorial for a given number. 72 00:03:40,880 --> 00:03:41,130 Right. 73 00:03:41,370 --> 00:03:42,870 So mathematical operation. 74 00:03:43,320 --> 00:03:47,430 We have written a function that will do this for us. 75 00:03:47,550 --> 00:03:54,330 Now, all that remains is simply to go to the main section and use some variable. 76 00:03:54,340 --> 00:03:56,730 It save my number. 77 00:03:56,790 --> 00:04:00,090 My num print a corresponding message. 78 00:04:00,120 --> 00:04:01,830 Enter the user. 79 00:04:01,830 --> 00:04:02,100 Right. 80 00:04:02,460 --> 00:04:09,510 Please, please insert insert a number that you want to calculate the factorial. 81 00:04:10,110 --> 00:04:12,120 So please enter the numbers. 82 00:04:12,150 --> 00:04:13,800 Can I have percentage the. 83 00:04:14,160 --> 00:04:21,990 You put it inside my now mine number and then you're are going to call these function and you are going 84 00:04:21,990 --> 00:04:23,410 to say all right. 85 00:04:23,430 --> 00:04:25,990 So are the factorial. 86 00:04:26,320 --> 00:04:26,820 All right. 87 00:04:26,970 --> 00:04:29,010 Let's say collectively as factorial. 88 00:04:29,460 --> 00:04:33,770 Here we will specify percentage the of the number itself. 89 00:04:33,810 --> 00:04:38,150 So percentage D equals two equals two percentage. 90 00:04:38,580 --> 00:04:41,060 And instead of the first percentage, B, right. 91 00:04:41,070 --> 00:04:46,950 Instead of this place holder, we are going to specify the number itself that we received from the user. 92 00:04:47,400 --> 00:04:54,660 And here, instead of these percentage D, we need to specify the result of the factorial on these given 93 00:04:54,660 --> 00:04:55,130 number. 94 00:04:55,140 --> 00:04:59,580 And the result is going to be the function we are calling the function with. 95 00:04:59,980 --> 00:05:04,840 No, and the function is going to return, the function is going to return. 96 00:05:04,870 --> 00:05:10,150 So instead of this function, here will be some return value, which is the result. 97 00:05:10,180 --> 00:05:14,920 We've calculated by multiplying this number of times. 98 00:05:15,010 --> 00:05:16,420 So I hope that's clear. 99 00:05:17,170 --> 00:05:20,480 We could we could use another variable in store. 100 00:05:20,650 --> 00:05:23,260 The result of the factorial inside of this variable. 101 00:05:23,290 --> 00:05:28,000 But for these exercises, that will be simply useless. 102 00:05:28,360 --> 00:05:36,250 So let's build and run it and see that both of our examples for these exercise works are so pleasing. 103 00:05:36,250 --> 00:05:37,070 Certain, no. 104 00:05:37,180 --> 00:05:38,290 Let's say three. 105 00:05:38,740 --> 00:05:41,440 So the factorial for three is six. 106 00:05:42,360 --> 00:05:44,170 And let's try the second number. 107 00:05:44,170 --> 00:05:45,470 It was five four. 108 00:05:45,480 --> 00:05:46,400 Make a mistaken. 109 00:05:47,020 --> 00:05:50,500 So the factorial for five is one hundred and twenty. 110 00:05:50,950 --> 00:05:58,810 So you've developed such a nice mathematical operation that you can also add to your calculator that 111 00:05:58,810 --> 00:05:59,620 you're developing. 112 00:05:59,710 --> 00:06:02,760 So thank you both for watching and I'll see you in the next video. 9197

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