1 00:00:00,480 --> 00:00:01,280 Welcome back. 2 00:00:01,540 --> 00:00:09,060 In this video, we are going to check out the assignment operators and the increment or decrement operators 3 00:00:09,060 --> 00:00:10,720 because we are going to use them quite a bit. 4 00:00:10,980 --> 00:00:13,680 So assignment operators are the ones you can see here. 5 00:00:13,680 --> 00:00:19,650 And we have already seen them to a certain degree where we just had a variable and I'm going to call 6 00:00:19,650 --> 00:00:27,510 this one, my name is going to be five and then I can go ahead and say my name, plus equal three. 7 00:00:27,720 --> 00:00:32,540 So what I will do is it will add three to my num value. 8 00:00:32,549 --> 00:00:40,430 So it's going to be the same thing as if I wrote my number equals my NUM plus three. 9 00:00:41,070 --> 00:00:41,440 All right. 10 00:00:41,460 --> 00:00:47,630 So these two are interchangeable and as you can see, it even prefers the other one. 11 00:00:47,640 --> 00:00:52,800 So it even prefers the operator assignment, as we have seen here. 12 00:00:53,340 --> 00:00:53,790 All right. 13 00:00:53,820 --> 00:01:01,670 So assignment operator, is this plus equal three or this minus equal or multiplied equal and so forth. 14 00:01:02,040 --> 00:01:10,590 So now I can of course, go ahead and print this print and it's going to be my name is Tolda my name 15 00:01:11,460 --> 00:01:19,290 and I'm going to comment on all our other print line statements from earlier videos. 16 00:01:19,290 --> 00:01:20,220 And it's around this again. 17 00:01:22,280 --> 00:01:25,320 And as we see says, my name is eight. 18 00:01:25,970 --> 00:01:29,000 All right, so that is an assignment operator. 19 00:01:29,010 --> 00:01:32,330 Now, please go ahead and multiply that with four. 20 00:01:32,330 --> 00:01:38,300 So multiply my number with four and stored that in my number to use an assignment operator for this. 21 00:01:40,810 --> 00:01:50,680 All right, I hope you tried it, so it's my num multiplication or asterisk equal four, and now let's 22 00:01:50,680 --> 00:01:51,510 print this again. 23 00:01:53,560 --> 00:01:54,460 And the next line. 24 00:01:55,910 --> 00:02:00,960 And we can see it's 32, all right, so these are the assignment operators. 25 00:02:01,200 --> 00:02:07,700 Now let's look at the increment and decrement operators because they are something that is used quite 26 00:02:07,700 --> 00:02:08,680 often as well. 27 00:02:08,810 --> 00:02:12,580 And they're just a double plus or double minus sign. 28 00:02:12,950 --> 00:02:20,090 So we can just go ahead and do the following myname plus plus nothing more than that. 29 00:02:20,570 --> 00:02:23,030 So let's print my name again. 30 00:02:25,140 --> 00:02:32,180 And this is going to be here, actually gets printed here, and that's printed after the incrementing, 31 00:02:32,430 --> 00:02:39,480 so this plus plus is incrementing, which means increasing the value by one and then minus Moniz's decremental, 32 00:02:39,570 --> 00:02:43,500 which means decreasing the value by one or reducing one. 33 00:02:45,330 --> 00:02:51,840 So once we run this, we can see my name is 32 and my name is 33, so my name is 32 here at this line 34 00:02:52,110 --> 00:02:54,250 and 33 in this line. 35 00:02:54,810 --> 00:02:56,460 So that's what this increment does. 36 00:02:56,460 --> 00:02:58,860 Now let's do a decrement. 37 00:02:58,860 --> 00:03:06,960 And at that same time, I want to show you something that is super interesting, and that is to use 38 00:03:06,960 --> 00:03:15,480 the increment after use, which means we use increment after my name and then again, we can use it 39 00:03:15,480 --> 00:03:16,260 before. 40 00:03:17,650 --> 00:03:23,140 So in this case, you can see we cannot just use this approach, we have to use the brackets. 41 00:03:23,140 --> 00:03:30,070 So I'm going to use curly brackets here as well, because this is an expression that I want to execute 42 00:03:30,340 --> 00:03:33,220 before actually printing it on the screen. 43 00:03:33,370 --> 00:03:38,650 So let me show you how this will impact our application here. 44 00:03:40,420 --> 00:03:42,180 So let's run this again. 45 00:03:44,310 --> 00:03:45,420 All right, so there we are. 46 00:03:45,780 --> 00:03:49,220 So we had my numbers, 33, that's this line here, right? 47 00:03:49,350 --> 00:03:58,030 So we increased my number of being 32, which was at this point, and then we increased it by one here. 48 00:03:58,470 --> 00:04:05,760 Then we go ahead and print that number and then we say, OK, let's increase the value by one. 49 00:04:06,540 --> 00:04:08,830 But for some reason, it didn't increase the value. 50 00:04:08,850 --> 00:04:09,540 Why is that? 51 00:04:09,960 --> 00:04:18,589 Well, that is because this plus plus will only be executed once this line of code is finished. 52 00:04:18,600 --> 00:04:21,000 So pretty much at the beginning of the next line. 53 00:04:21,000 --> 00:04:25,780 So in line 75, my number is still 33. 54 00:04:26,370 --> 00:04:27,990 Then it's increased by one. 55 00:04:27,990 --> 00:04:36,180 So in line seventy six at the beginning of the line it's going to be 34 and then would you plus plus 56 00:04:36,180 --> 00:04:36,570 minus. 57 00:04:36,660 --> 00:04:44,220 Which means we increment just before we execute or we use this variable, which means that now it was 58 00:04:44,220 --> 00:04:51,480 34 at this point plus one, which means now it's 35 and that's exactly what is printed onto the console. 59 00:04:51,510 --> 00:04:55,460 So now you can see that my name is 35. 60 00:04:55,830 --> 00:05:01,500 So that's the difference between using the plus plus or the increment or decrement operators before 61 00:05:01,530 --> 00:05:06,680 or after, because it really has an impact on when they are executed. 62 00:05:06,690 --> 00:05:09,210 And now, you know, the difference. 63 00:05:09,570 --> 00:05:12,120 But very commonly it's used afterwards. 64 00:05:12,120 --> 00:05:17,910 So you increment after words because usually you don't use it in line as we do it here. 65 00:05:19,870 --> 00:05:25,720 So now please add another print line statement just underneath it, so in line 77, in my case, just 66 00:05:25,720 --> 00:05:35,980 underneath this statement, and they're decreased to value so that it will show my name is 34 as the 67 00:05:35,980 --> 00:05:37,560 next print line statement. 68 00:05:39,510 --> 00:05:41,160 All right, so I hope you tried it. 69 00:05:42,060 --> 00:05:47,830 So what I need here, of course, is to use minus minus before my name and not after my name. 70 00:05:47,880 --> 00:05:56,880 So I'm going to decrement the mine unbearable just before it is going to be displayed and printed onto 71 00:05:56,880 --> 00:05:57,490 the console. 72 00:05:58,170 --> 00:06:01,620 So just before it will be used to say so. 73 00:06:01,620 --> 00:06:02,230 There we are. 74 00:06:02,280 --> 00:06:04,590 It says, my name is 34. 75 00:06:05,480 --> 00:06:12,650 All right, so that's assignment operators and the increment and decrement operators, and in the next 76 00:06:12,650 --> 00:06:19,790 video, we are going to see how we can finally use some of those operations usefully, because so far 77 00:06:20,060 --> 00:06:23,230 we had some examples of what we can do with it. 78 00:06:23,240 --> 00:06:28,940 But now let's see what we actually can do with it and get something from it, because so far it has 79 00:06:28,940 --> 00:06:31,820 been rather fundamental or rather basic. 80 00:06:31,830 --> 00:06:35,540 So see in the next video where we're going to check out if statements.