1 00:00:00,600 --> 00:00:09,060 So the value of a variable is fine as you can see I didn't assign a value to this valuable. 2 00:00:09,540 --> 00:00:16,780 When I created this valuable so this value comes from this value comes from this line of code here. 3 00:00:17,040 --> 00:00:26,080 OK here I assigned the value of the Zed's valuable to all of my valuables OK. 4 00:00:26,100 --> 00:00:36,600 As you can see so here in this line of code I specified that a assignment operator B assignment operator 5 00:00:36,730 --> 00:00:39,850 C and assignment operator is that. 6 00:00:39,930 --> 00:00:40,530 OK. 7 00:00:40,770 --> 00:00:47,560 So actually I assigned the value of this variable which is the that variable. 8 00:00:47,610 --> 00:00:54,290 Ok I assigned the value of this variable which is 5 to the variable. 9 00:00:54,420 --> 00:00:59,490 And then I assigned the value of this variable to the Beaverhead table here. 10 00:00:59,700 --> 00:01:04,620 And then I assigned the value of this variable to the a variable. 11 00:01:04,620 --> 00:01:05,100 OK. 12 00:01:05,190 --> 00:01:12,090 As you can see here and as you can see in the console the value of the variable is 5. 13 00:01:12,090 --> 00:01:14,970 The value of that be valuable is five. 14 00:01:14,970 --> 00:01:20,320 The value of the C variable is 5 and the value of this that Loughrea about is 5. 15 00:01:20,400 --> 00:01:20,900 OK. 16 00:01:21,090 --> 00:01:26,700 So you can actually assign values to your variables in this way that I showed you. 17 00:01:26,700 --> 00:01:27,070 OK. 18 00:01:27,090 --> 00:01:33,360 So as I said before assigning a value to a variable is an expression. 19 00:01:33,450 --> 00:01:33,920 OK. 20 00:01:34,080 --> 00:01:38,900 So here in this line of code for example we are assigning a value to this variable. 21 00:01:39,040 --> 00:01:39,520 OK. 22 00:01:39,540 --> 00:01:45,030 So this line of code is an expression OK because it produces a value. 23 00:01:45,060 --> 00:01:53,330 So the right side of an assignment expression always is calculated before the assignment takes place. 24 00:01:53,640 --> 00:01:58,290 So as you can see of it we actually assign a value to this variable. 25 00:01:58,320 --> 00:02:06,650 For example if I want to multiply this number by for this operation here is going to be evaluated first 26 00:02:06,990 --> 00:02:13,830 and then the result of this operation will be assigned to the value on the left hand side of the OPERATOR 27 00:02:13,950 --> 00:02:15,500 OK. 28 00:02:15,540 --> 00:02:20,030 So if I want to actually again I want food the value of this variable to the console. 29 00:02:20,100 --> 00:02:23,440 So as you can see the value of that variable is 20. 30 00:02:23,620 --> 00:02:32,160 Okay the right side of an assignment expression is always the right side of an assignment expression 31 00:02:32,520 --> 00:02:36,450 always is calculated before the assignment takes place. 32 00:02:36,480 --> 00:02:36,880 OK. 33 00:02:36,900 --> 00:02:44,010 So this operation here is going to be calculated first and then the value of this operation is going 34 00:02:44,010 --> 00:02:48,280 to be assigned to the value on the left hand side of the OPERATOR OK. 35 00:02:48,420 --> 00:02:51,240 So this is not an equal OPERATOR OK. 36 00:02:51,660 --> 00:02:54,120 This is an assignment operator. 37 00:02:54,120 --> 00:02:55,580 This is very important. 38 00:02:55,590 --> 00:02:56,720 OK. 39 00:02:56,790 --> 00:03:03,750 Using an expression to change of variables value is a common task in programming. 40 00:03:03,770 --> 00:03:04,320 OK. 41 00:03:04,350 --> 00:03:07,550 Several operators are used in these cases. 42 00:03:07,800 --> 00:03:14,850 So first let me actually comment out these lines of code here because I don't want to execute that. 43 00:03:14,870 --> 00:03:16,710 So now let me show you some examples. 44 00:03:16,730 --> 00:03:17,170 OK. 45 00:03:17,240 --> 00:03:20,140 For example I want to create two variables here. 46 00:03:20,150 --> 00:03:20,750 OK. 47 00:03:20,900 --> 00:03:26,870 So the data type of my variable is ain't and the name of my volumen is not one. 48 00:03:26,920 --> 00:03:27,490 OK. 49 00:03:27,680 --> 00:03:30,410 And then I assign a value to my variable. 50 00:03:30,410 --> 00:03:32,290 For example numbers 10 or J. 51 00:03:32,420 --> 00:03:37,040 And then at the end of my statement I need to put in a semi-colon OK. 52 00:03:37,610 --> 00:03:45,730 And here I want to create another variable in the name of my variable would be number two. 53 00:03:46,070 --> 00:03:48,650 And then I assign a value to my variable. 54 00:03:48,650 --> 00:03:50,120 For example number 8. 55 00:03:50,220 --> 00:03:50,700 OK. 56 00:03:50,780 --> 00:03:54,540 And then I need to add the semi-colon at the end of my value. 57 00:03:54,550 --> 00:04:00,440 OK so now I want to show you some operators in order to change of variables value. 58 00:04:00,470 --> 00:04:01,130 OK. 59 00:04:01,160 --> 00:04:07,030 And in the past we wanted to actually add a value to our variable. 60 00:04:07,130 --> 00:04:15,650 We would just refer to the name of our variable and then we put an assignment operator and then we referred 61 00:04:15,800 --> 00:04:17,170 to the name of our idea. 62 00:04:17,300 --> 00:04:20,820 And then we for example added a value to our value. 63 00:04:20,880 --> 00:04:27,990 OK so let me actually output the value of this variable with the concert system. 64 00:04:28,090 --> 00:04:35,780 Of that printin and then inside the parenthesis I just need to refer to the name of my variable here 65 00:04:36,320 --> 00:04:39,560 and at the end of my statement I need to put in a semi-colon. 66 00:04:39,570 --> 00:04:45,980 OK so if I run my project as you can see it's going to output this value for the console. 67 00:04:46,010 --> 00:04:46,930 OK. 68 00:04:47,300 --> 00:04:52,110 This value is the result of this operation that you can see here. 69 00:04:52,250 --> 00:04:52,730 OK. 70 00:04:52,820 --> 00:04:56,580 And here we assigned this value to our variable here. 71 00:04:56,600 --> 00:04:57,390 OK. 72 00:04:57,770 --> 00:05:01,290 Or I can actually add one value to my variable. 73 00:05:01,610 --> 00:05:07,410 And then if I run on my project as you can see it's going to output this value to the console. 74 00:05:07,630 --> 00:05:08,600 OK. 75 00:05:09,350 --> 00:05:15,810 So now let me show you another way of actually adding one value to our variable. 76 00:05:16,040 --> 00:05:16,510 OK. 77 00:05:16,580 --> 00:05:21,360 Again I need to refer to the name of my variable number one. 78 00:05:21,560 --> 00:05:27,180 And then I put the plus operator and the assignment operator OK. 79 00:05:27,620 --> 00:05:34,790 And then I just put in the number one here and at the end of my statement I need to add the semi-colon. 80 00:05:34,790 --> 00:05:36,230 OK. 81 00:05:36,230 --> 00:05:45,230 So if I actually output the value of this variable to the console Now system that out that insulin and 82 00:05:45,230 --> 00:05:52,250 then inside the prentices again I need to refer to the name of my variable and I need to actually add 83 00:05:52,310 --> 00:05:57,600 the semi-colon at the end of my statement in order to end this statement here. 84 00:05:57,830 --> 00:06:04,520 And if you run my project as you can see it's going to Outwood is going to output this value to the 85 00:06:04,520 --> 00:06:06,230 console like a number two. 86 00:06:06,450 --> 00:06:07,250 OK. 87 00:06:07,400 --> 00:06:16,220 So here in this line of code we added one value to our rowdier and so for example if we wanted to add 88 00:06:16,430 --> 00:06:21,470 free value to our free value free. 89 00:06:22,580 --> 00:06:25,610 So for example if I wanted to add free value. 90 00:06:25,940 --> 00:06:28,560 So for example. 91 00:06:29,210 --> 00:06:30,600 So for example. 92 00:06:30,800 --> 00:06:37,820 So for example if I wanted to add free to my valuable Let's see what happens let's let's run our project 93 00:06:37,850 --> 00:06:38,930 and see what happens. 94 00:06:38,930 --> 00:06:43,650 So as you can see it's going to add free value to the value of our value. 95 00:06:43,660 --> 00:06:44,250 OK. 96 00:06:44,570 --> 00:06:46,940 11 plus free is 14. 97 00:06:47,120 --> 00:06:47,540 OK. 98 00:06:47,540 --> 00:06:55,530 For example if I wanted to actually subtract some values from the value of this not too variable. 99 00:06:55,790 --> 00:06:58,430 I just need to type in here number two. 100 00:06:58,600 --> 00:06:59,200 Okay. 101 00:06:59,210 --> 00:07:07,570 And then I just need to put in minus and assignment operator here and here I need to actually put in 102 00:07:08,180 --> 00:07:12,540 there value that want to subtract from the value of this variable. 103 00:07:12,600 --> 00:07:14,510 Ok for example 5. 104 00:07:14,990 --> 00:07:18,940 And then at the end of my statement I need to put in a semi-colon OK. 105 00:07:19,190 --> 00:07:24,870 So I just need to type in here system that out that princeling. 106 00:07:25,840 --> 00:07:30,670 And then inside Apprentice's I just need to refer to the name of my value. 107 00:07:30,850 --> 00:07:35,260 And at the end of my statement I need to put in a semi-colon OK. 108 00:07:35,680 --> 00:07:40,990 So if I do it on my project as you can see it's going to output this value to the console. 109 00:07:41,030 --> 00:07:44,330 OK so 8 minus five is free. 110 00:07:44,580 --> 00:07:44,850 OK. 111 00:07:44,860 --> 00:07:54,790 As you can see here so as you can see here this statement here is the same as this statement. 112 00:07:54,830 --> 00:07:55,580 OK. 113 00:07:55,620 --> 00:08:01,760 Now one and then we put the assignment operator and then if you put the name of our variable plus number 114 00:08:01,760 --> 00:08:02,150 one. 115 00:08:02,240 --> 00:08:03,190 OK. 116 00:08:03,710 --> 00:08:09,500 And again this statement here is the same as this statement. 117 00:08:10,100 --> 00:08:15,570 And this one again is the same as this statement OK. 118 00:08:16,170 --> 00:08:20,900 And this statement is the same as this statement. 119 00:08:21,300 --> 00:08:25,890 And this statement is the same as this statements. 120 00:08:25,890 --> 00:08:26,660 OK. 121 00:08:27,210 --> 00:08:31,830 So this way of actually writing your statements is a lot of advice. 122 00:08:31,860 --> 00:08:32,340 OK. 123 00:08:32,400 --> 00:08:36,120 So you can actually assign values to your variables this way. 124 00:08:36,320 --> 00:08:36,780 OK. 125 00:08:36,960 --> 00:08:43,580 But are wanted to show you how you can actually assign values to your variables in this way. 126 00:08:43,710 --> 00:08:51,700 So maybe in the future you may see in some other source codes the program may have actually used this 127 00:08:51,710 --> 00:08:57,570 way of assigning values to the ballots in his or her Java programs. 128 00:08:57,610 --> 00:09:02,300 OK this is just another way of assigning values to your valuables. 129 00:09:02,310 --> 00:09:02,760 OK. 130 00:09:02,760 --> 00:09:10,080 So another important point that I want to show you here is that for example if I want to declare another 131 00:09:10,080 --> 00:09:10,990 variable here. 132 00:09:11,090 --> 00:09:13,600 Ain't no free. 133 00:09:14,250 --> 00:09:16,460 And then I assign a value to my value. 134 00:09:16,490 --> 00:09:17,250 OK. 135 00:09:17,580 --> 00:09:25,010 So here if you want to add value to my variable i just need to type in here now free plus. 136 00:09:25,050 --> 00:09:26,950 And then the assignment operator. 137 00:09:27,180 --> 00:09:30,120 And then I just need to put in a value here. 138 00:09:30,120 --> 00:09:31,610 For example number four. 139 00:09:31,790 --> 00:09:32,220 OK. 140 00:09:32,220 --> 00:09:35,400 At the end of my statement I need to put in a semi-colon. 141 00:09:35,730 --> 00:09:41,520 So if I actually want to output the value of this variable to the console I just need to type in your 142 00:09:41,520 --> 00:09:49,390 system with out that insulin and then inside the prentices I need to refer to the name of my variable. 143 00:09:49,610 --> 00:09:50,300 Now free. 144 00:09:50,390 --> 00:09:54,230 And then at the end of my statement I need to add the semi-colon OK.