All language subtitles for 7. Operator Precedence

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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,620 --> 00:00:06,000 Welcome back let's talk about a important term when it comes to programming. 2 00:00:06,270 --> 00:00:11,530 And that is operator precedents. 3 00:00:11,550 --> 00:00:13,030 Now what does that mean. 4 00:00:13,230 --> 00:00:17,540 Again we're using our knowledge from math class. 5 00:00:17,610 --> 00:00:28,530 It's the idea that if I do 20 plus three times four it means that different operators have precedence 6 00:00:28,590 --> 00:00:30,560 over different ones. 7 00:00:30,620 --> 00:00:40,600 That is we multiply this first equals to twelve and then 20 gets added to twelve because the Python 8 00:00:40,600 --> 00:00:44,880 interpreter is going to follow a basic set of rules. 9 00:00:45,000 --> 00:00:59,130 For example if I do 20 minus three here and let's print this out click Run I get eight because three 10 00:00:59,130 --> 00:01:06,260 times four gets evaluated first which equals to 12 and then subtracted from 20. 11 00:01:06,300 --> 00:01:14,340 It's not that this goes first and then we multiply 17 by four and this operator precedents shouldn't 12 00:01:14,340 --> 00:01:14,880 be new. 13 00:01:14,880 --> 00:01:15,210 Right. 14 00:01:15,210 --> 00:01:22,620 If you've taken any sort of math class you understand that this is how well math works and this works 15 00:01:22,620 --> 00:01:24,740 the same in all programming languages. 16 00:01:24,780 --> 00:01:28,390 So the order is this first. 17 00:01:28,590 --> 00:01:30,270 We follow the brackets. 18 00:01:30,270 --> 00:01:33,600 So whatever is wrapped in a bracket we do first. 19 00:01:33,600 --> 00:01:38,190 The second is we do the power of. 20 00:01:38,190 --> 00:01:43,410 So whatever is done in the power of will be after parentheses. 21 00:01:43,560 --> 00:01:55,970 For example if I do parentheses here and then to the power of let's say two or less two plus two to 22 00:01:55,970 --> 00:01:57,550 the power of two. 23 00:01:57,590 --> 00:02:05,950 Well the first operation that will happen is 20 minus three because that's the first precedence. 24 00:02:06,140 --> 00:02:13,890 And then we do two to the power of two because that's the next precedence and then only after we do 25 00:02:13,890 --> 00:02:16,170 that we add these two together. 26 00:02:16,170 --> 00:02:21,560 If I click Run I get twenty one which again makes sense. 27 00:02:21,580 --> 00:02:35,170 Seventeen plus four after the power of we have the multiplication and division and then finally the 28 00:02:35,170 --> 00:02:40,040 last precedence is addition and subtraction. 29 00:02:40,050 --> 00:02:42,660 Now this isn't going to be a math class. 30 00:02:42,690 --> 00:02:44,560 Some people really love math. 31 00:02:44,580 --> 00:02:46,570 Some people really don't. 32 00:02:46,710 --> 00:02:51,780 But I want to just give you this basic understanding of operator precedence. 33 00:02:51,810 --> 00:02:52,590 When you see it. 34 00:02:52,620 --> 00:02:55,400 We'll do some exercises here to get accustomed to it. 35 00:02:55,470 --> 00:02:59,880 But trust me this is as mathy as we're gonna get in this course. 36 00:02:59,880 --> 00:03:03,300 The math part of the course is well just here. 37 00:03:03,450 --> 00:03:07,900 It's gonna get a lot more interesting as we learn about different data types. 38 00:03:08,070 --> 00:03:09,390 I'll see in the next one. 39 00:03:09,420 --> 00:03:09,830 Bye bye. 3586

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