1 00:00:00,520 --> 00:00:06,250 Really well and then I use a plus operator and then I refer to the name the name of your body. 2 00:00:06,260 --> 00:00:13,170 But for example number here and that again I can use a plus operator in order to concatenate these values 3 00:00:13,320 --> 00:00:19,060 to other values for example again I use double quotes and inside the double code. 4 00:00:19,110 --> 00:00:22,060 I just use actually space here. 5 00:00:22,500 --> 00:00:24,600 And then I can enter my text. 6 00:00:24,600 --> 00:00:32,320 For example this is my variable and this is great. 7 00:00:32,380 --> 00:00:37,360 This is great for programming. 8 00:00:37,370 --> 00:00:46,090 So now if I actually press on the Enter key on my keyboard Let's see what happens. 9 00:00:46,670 --> 00:00:47,260 OK. 10 00:00:47,360 --> 00:00:48,760 Just press ENTER key. 11 00:00:48,890 --> 00:00:56,660 So as you can see it automatically puts up plus operator and two double codes in order to help me continue 12 00:00:56,660 --> 00:00:57,900 adding other values. 13 00:00:57,920 --> 00:00:58,460 OK. 14 00:00:58,550 --> 00:01:06,640 For example here inside these double quotes I can put another value for example other values. 15 00:01:06,740 --> 00:01:07,480 OK. 16 00:01:07,820 --> 00:01:12,680 And then at the end I just need to put a semicolon into my statement. 17 00:01:12,710 --> 00:01:17,480 So now actually let's run our project and see what happens. 18 00:01:17,480 --> 00:01:23,620 So as you can see it now it has output had these values to their console area. 19 00:01:23,690 --> 00:01:24,430 OK. 20 00:01:24,860 --> 00:01:27,090 So I think that's enough for concatenation. 21 00:01:27,140 --> 00:01:27,700 OK. 22 00:01:27,800 --> 00:01:32,890 Now I want to output the value of this and other number variable to the console. 23 00:01:32,980 --> 00:01:33,850 OK. 24 00:01:34,100 --> 00:01:40,160 So first let me point out that I don't want to execute these other statements here. 25 00:01:40,160 --> 00:01:43,630 So I just need to actually comment out these lines of code. 26 00:01:43,940 --> 00:01:44,350 OK. 27 00:01:44,360 --> 00:01:53,520 As you can see here so now as you can see I want to output the value of this variable to the concert 28 00:01:54,390 --> 00:02:00,010 and you can see that I didn't assign a value to my variable here. 29 00:02:00,030 --> 00:02:06,900 So now let's just output the value of this and other number but as you can see here to the console. 30 00:02:06,930 --> 00:02:07,550 OK. 31 00:02:07,830 --> 00:02:13,000 So we need to type in a system that's out that princeling. 32 00:02:13,680 --> 00:02:18,660 And that inside the apprentice's just referred to the name of that variable. 33 00:02:18,700 --> 00:02:22,250 OK the number okay. 34 00:02:22,520 --> 00:02:27,430 And then we need to put a semicolon at the end of our statement. 35 00:02:27,560 --> 00:02:31,950 So as you can see here it's now showing us a nasty error. 36 00:02:32,090 --> 00:02:34,290 So let's see what's this error. 37 00:02:34,700 --> 00:02:37,630 As you can see here it says the local variable. 38 00:02:37,630 --> 00:02:40,860 Another number may not have been initialized. 39 00:02:40,940 --> 00:02:46,900 I talked more about local variables later in this section but for now just ignore it. 40 00:02:47,090 --> 00:02:52,880 And as you can see here it's now telling us that this another number of about does not have a value. 41 00:02:52,940 --> 00:02:59,550 OK we didn't assign a value to this variable when we created this variable. 42 00:02:59,750 --> 00:03:05,250 So now if I for example assign a value numbers 10 to this variable. 43 00:03:05,260 --> 00:03:07,340 Now as you can see the error is gone. 44 00:03:07,370 --> 00:03:09,680 Now I can run my project. 45 00:03:09,680 --> 00:03:10,880 So this is number 10. 46 00:03:10,950 --> 00:03:15,550 OK this is the value of this and other numbers here. 47 00:03:15,620 --> 00:03:21,950 So it's a very good programming practice that you assign a value to your valuables when you create them. 48 00:03:22,160 --> 00:03:22,840 OK. 49 00:03:23,210 --> 00:03:27,770 But let me point out another important point here. 50 00:03:27,770 --> 00:03:34,060 For example if I actually assign a value value to my variable and now is showing us an error. 51 00:03:34,070 --> 00:03:34,490 OK. 52 00:03:34,550 --> 00:03:41,050 So if I hover over the error it's now recommending us that we should initialize the variable. 53 00:03:41,060 --> 00:03:41,600 OK. 54 00:03:41,750 --> 00:03:44,460 So if I click on this initialize Maribelle. 55 00:03:45,020 --> 00:03:49,600 Now as you can see it automatically assigned a value to my body. 56 00:03:49,760 --> 00:03:51,120 Now the error is gone. 57 00:03:51,260 --> 00:03:55,780 And when I run my project the value of my variable is showing here. 58 00:03:55,820 --> 00:03:56,320 OK. 59 00:03:56,440 --> 00:03:57,090 OK. 60 00:03:57,230 --> 00:04:01,810 Now I'm going to you about declaring variables in another way. 61 00:04:01,910 --> 00:04:02,470 OK. 62 00:04:02,630 --> 00:04:06,320 So first let me comment out these lines of code. 63 00:04:06,700 --> 00:04:07,160 OK. 64 00:04:07,190 --> 00:04:09,020 Because I don't want to execute them. 65 00:04:09,290 --> 00:04:17,840 So first let me actually point out when you are creating several variables of the same type you can 66 00:04:17,840 --> 00:04:24,320 declare all of them in the same statement by separating the variable names with commas. 67 00:04:24,370 --> 00:04:27,360 OK so what do you mean by that. 68 00:04:27,410 --> 00:04:31,740 First let me assure you that I will not declare three different variables here. 69 00:04:31,780 --> 00:04:36,430 OK the first one would be it is data type is it. 70 00:04:36,440 --> 00:04:37,390 As you can see here. 71 00:04:37,640 --> 00:04:39,870 And the name of my variable is number one. 72 00:04:39,980 --> 00:04:48,570 OK the second one will be in again and its name will be known to the first one with the end and the 73 00:04:48,580 --> 00:04:50,040 it's name would be number three. 74 00:04:50,090 --> 00:04:50,780 OK. 75 00:04:50,780 --> 00:04:57,020 So as you can see here I've got three different variables but it's the same as you can see with the 76 00:04:57,020 --> 00:04:57,990 same data. 77 00:04:58,010 --> 00:04:58,520 OK. 78 00:04:58,670 --> 00:05:04,970 Three different variables with three different names but these three variables have got the same data 79 00:05:05,030 --> 00:05:06,400 type which is in here. 80 00:05:06,440 --> 00:05:06,950 OK. 81 00:05:07,220 --> 00:05:12,040 So now I want to show you how you can declare these variables in an other way. 82 00:05:12,170 --> 00:05:12,570 OK. 83 00:05:12,710 --> 00:05:17,280 So first let me actually comment about these three variables here. 84 00:05:17,510 --> 00:05:18,650 As you can see here. 85 00:05:18,830 --> 00:05:25,010 So now I want to show you another way to actually declare this for the variables the data type as you 86 00:05:25,010 --> 00:05:26,230 can see here is it. 87 00:05:26,270 --> 00:05:31,030 OK so now the name of the first variable is number one. 88 00:05:31,130 --> 00:05:32,660 So now I'm typing here now what. 89 00:05:32,670 --> 00:05:34,500 It's a comma. 90 00:05:34,940 --> 00:05:37,890 The name of the second variable is number two. 91 00:05:38,180 --> 00:05:41,290 Ok now I'm typing here not to. 92 00:05:41,320 --> 00:05:41,850 OK. 93 00:05:41,930 --> 00:05:42,620 After the comma. 94 00:05:42,620 --> 00:05:43,730 Just type in two. 95 00:05:43,820 --> 00:05:50,310 OK the name of this first actually the name of the first variable is now three. 96 00:05:50,390 --> 00:05:53,350 So I just type here number three. 97 00:05:53,720 --> 00:05:59,280 So as you can see here I declared these free variables in one statement here. 98 00:05:59,400 --> 00:06:03,980 OK these are these are three different variables with the same. 99 00:06:04,190 --> 00:06:11,970 Actually data type and also make sure that you put the semi-colon at the end of your statement here. 100 00:06:12,020 --> 00:06:14,300 OK this is very important. 101 00:06:14,360 --> 00:06:19,290 So now you may ask that can I actually assign values to these variables here. 102 00:06:19,340 --> 00:06:19,990 Yes you can. 103 00:06:20,000 --> 00:06:23,940 For example I can assign a value to this. 104 00:06:23,960 --> 00:06:25,460 Now one variable here. 105 00:06:25,550 --> 00:06:26,040 OK. 106 00:06:26,180 --> 00:06:29,060 So first I need an assignment operator. 107 00:06:29,090 --> 00:06:36,790 As I said before and that I need a value to actually assign that value to this variable so the value 108 00:06:36,810 --> 00:06:37,220 would be. 109 00:06:37,220 --> 00:06:38,820 For example number 50. 110 00:06:38,930 --> 00:06:39,740 OK. 111 00:06:39,740 --> 00:06:45,770 Now as you can see here I assigned the value of 50 on the right hand side of the operator to the left 112 00:06:45,770 --> 00:06:47,050 hand side of the operator. 113 00:06:47,100 --> 00:06:48,930 And now you may ask that. 114 00:06:48,970 --> 00:06:53,380 Can I actually output the value of this variable to the console. 115 00:06:53,510 --> 00:06:54,430 Yes you can. 116 00:06:54,610 --> 00:07:02,750 You can actually just type in here a system that out that print line and inside the parenthesis you 117 00:07:02,750 --> 00:07:06,450 just need to refer to the name of that specific value. 118 00:07:06,490 --> 00:07:10,780 OK so now I want to read the value of this valuable here. 119 00:07:10,910 --> 00:07:14,840 So I just need to refer to the name of that variable which is number 1. 120 00:07:14,870 --> 00:07:15,390 OK. 121 00:07:15,530 --> 00:07:18,930 And at the end I need to put the semicolon here. 122 00:07:19,120 --> 00:07:19,680 OK. 123 00:07:20,010 --> 00:07:25,830 So now if I run my project as you can see it's going to output the value of 50 to the console. 124 00:07:25,890 --> 00:07:31,750 And here if I want to for example refer to the name of the valuable number two. 125 00:07:31,980 --> 00:07:38,820 Let's see what happens system that out that Queensland land and inside the prentices. 126 00:07:39,090 --> 00:07:43,910 I just need to refer to the name of this variable in order to read its value. 127 00:07:44,030 --> 00:07:44,590 OK. 128 00:07:44,790 --> 00:07:50,940 So if I just typed in here number two and at the end I just need to put a semicolon here at the end 129 00:07:50,940 --> 00:07:52,600 of my statement. 130 00:07:52,650 --> 00:07:58,530 So as you can see here it's going to show me an error again because I didn't assign a value to this 131 00:07:58,530 --> 00:07:59,470 variable here. 132 00:07:59,540 --> 00:08:00,390 OK. 133 00:08:00,420 --> 00:08:06,850 So now if I actually assign a value for example number 20 to this variable. 134 00:08:06,900 --> 00:08:10,230 The error is gone and I can run my project now. 135 00:08:10,470 --> 00:08:16,360 And now I want to output the value of this number three valuable to the console. 136 00:08:16,440 --> 00:08:22,260 OK so now let me show you how you can do that because you want to actually explain another important 137 00:08:22,260 --> 00:08:26,110 point about assigning values to variables. 138 00:08:26,240 --> 00:08:32,080 OK now I'm going to output the value of is now free variable to the cost. 139 00:08:32,100 --> 00:08:32,800 OK. 140 00:08:33,030 --> 00:08:42,210 So first I need to type in System system that out that print alone and inside Apprentice's. 141 00:08:42,450 --> 00:08:45,830 I just need to refer to this now everywhere. 142 00:08:45,870 --> 00:08:46,450 OK. 143 00:08:46,860 --> 00:08:48,360 Now I'm free. 144 00:08:48,570 --> 00:08:52,840 And then at the end of my statement I just say to put in our semicolon. 145 00:08:52,920 --> 00:08:53,660 OK. 146 00:08:54,120 --> 00:09:00,630 So now as you can see it's now showing me an error again because I didn't assign a value to this variable 147 00:09:00,630 --> 00:09:02,150 when I created this variable. 148 00:09:02,160 --> 00:09:02,740 OK. 149 00:09:02,880 --> 00:09:09,840 So now I want to show you how you can actually assign a value in our variable after creation of that 150 00:09:09,840 --> 00:09:10,560 variable. 151 00:09:10,710 --> 00:09:15,990 So now as you can see I'm going to refer to the name of this variable not. 152 00:09:16,110 --> 00:09:16,780 OK. 153 00:09:16,980 --> 00:09:20,520 And then I just put in us an assignment operator. 154 00:09:20,970 --> 00:09:26,650 And then I just assign a value to my variable for example number 50 55. 155 00:09:26,760 --> 00:09:27,510 OK. 156 00:09:27,990 --> 00:09:30,380 So as you can see the error is now gone. 157 00:09:30,570 --> 00:09:31,050 OK. 158 00:09:31,230 --> 00:09:38,440 So now if I run my project as you can see here it's going to Outwood this value of 35 to the concert. 159 00:09:38,460 --> 00:09:46,000 OK so first let me actually comment out these two lines of code and again I just need to run my project 160 00:09:46,030 --> 00:09:47,090 as you can see here. 161 00:09:47,200 --> 00:09:51,110 It's going to outfalls the value of 35 to the concert. 162 00:09:51,130 --> 00:09:53,320 This value is the value of this. 163 00:09:53,320 --> 00:09:54,260 Now everybody about.