1 00:00:00,300 --> 00:00:06,030 So I need to actually write another line of code in order to put the value of this variable. 2 00:00:06,270 --> 00:00:07,590 After the decremented. 3 00:00:07,600 --> 00:00:07,950 OK. 4 00:00:07,950 --> 00:00:13,240 So in this line of code we decremented the value of this variable by one. 5 00:00:13,350 --> 00:00:13,820 OK. 6 00:00:13,980 --> 00:00:22,540 So I need to type in here system that out that print land and then inside Apprentice's it refers to 7 00:00:22,560 --> 00:00:24,650 the name of my variable. 8 00:00:25,500 --> 00:00:28,830 And then at the end of my statement I need to put in a semicolon. 9 00:00:28,840 --> 00:00:29,370 OK. 10 00:00:29,640 --> 00:00:35,290 So now if I run my project as you can see it's going to output this value to the consulate. 11 00:00:35,430 --> 00:00:38,900 The value of my value is now subtracted by 1. 12 00:00:39,030 --> 00:00:40,040 OK. 13 00:00:40,620 --> 00:00:46,920 So that sets up for actually incrementing and decrementing operator. 14 00:00:46,980 --> 00:00:55,160 So these increment and decrement operators can be placed before or after a variable name. 15 00:00:55,290 --> 00:00:56,230 OK. 16 00:00:56,580 --> 00:00:58,500 So now let me show you some examples. 17 00:00:58,590 --> 00:01:02,770 When we actually place these operators before the variable name. 18 00:01:02,790 --> 00:01:03,310 OK. 19 00:01:03,480 --> 00:01:10,560 So for example I want to create another variable here ain't number one and then I assign a value to 20 00:01:10,560 --> 00:01:11,410 my variable here. 21 00:01:11,430 --> 00:01:12,010 OK. 22 00:01:12,240 --> 00:01:15,440 And then at the end of my statement I need to put in a semicolon. 23 00:01:15,600 --> 00:01:22,660 So now I want to output the value of this to the console system out of that princeling and then inside 24 00:01:22,650 --> 00:01:23,520 the practices. 25 00:01:23,730 --> 00:01:29,190 I just need to refer to the name of my variable and at the end of my statement I need to put in a semi-colon. 26 00:01:29,190 --> 00:01:29,710 OK. 27 00:01:30,000 --> 00:01:35,070 So now if I run my project as you can see it's going to output this value to the console. 28 00:01:35,070 --> 00:01:35,750 OK. 29 00:01:36,240 --> 00:01:42,340 So now I want to use this increment or decrement operator before the variable name. 30 00:01:42,450 --> 00:01:44,990 So now I put the increment operator. 31 00:01:45,240 --> 00:01:50,240 And after that I referred to the name of my valuable number one. 32 00:01:50,720 --> 00:01:51,500 OK. 33 00:01:51,510 --> 00:01:55,010 And then at the end of my statement I need to put in a semi-colon. 34 00:01:55,320 --> 00:01:58,730 So now I want to output the value of this valuable to the console. 35 00:01:58,780 --> 00:02:06,230 Sister out of print land and then inside the parenthesis I need to refer to the name of my variable 36 00:02:06,990 --> 00:02:11,660 non-fun and at the end of my statement I need to put a semicolon. 37 00:02:11,660 --> 00:02:12,200 OK. 38 00:02:12,410 --> 00:02:15,920 So now if I write on my project let's see what happens. 39 00:02:15,950 --> 00:02:20,980 So as you can see again it increments the value of this variable by 1. 40 00:02:21,050 --> 00:02:22,060 OK. 41 00:02:22,550 --> 00:02:27,070 So this is the code for actually incrementing the value of this variable by 1. 42 00:02:27,130 --> 00:02:27,720 OK. 43 00:02:27,890 --> 00:02:30,760 We put the increments. 44 00:02:30,770 --> 00:02:35,260 Operator we put the increment operator before the variable name. 45 00:02:35,330 --> 00:02:36,170 OK. 46 00:02:36,740 --> 00:02:41,260 And if you want to actually decrement the value of this variable by one. 47 00:02:41,300 --> 00:02:44,010 So let me comment out these lines of code here. 48 00:02:44,240 --> 00:02:48,010 And now I want to decrement the value of this variable by 1. 49 00:02:48,050 --> 00:02:48,670 OK. 50 00:02:48,920 --> 00:02:52,980 So I put the decrement operator before the value. 51 00:02:53,110 --> 00:02:54,190 OK. 52 00:02:55,070 --> 00:02:59,170 So as you can see I need to put a semi-colon at the end of my statement. 53 00:02:59,270 --> 00:03:05,900 So now I want to output the value of this valuable to the concert system that's out that printer land. 54 00:03:06,560 --> 00:03:12,290 And then inside the prentices I need to refer to the name of my variable and at the end of my statement 55 00:03:12,350 --> 00:03:14,030 I need to put in a semicolon. 56 00:03:14,240 --> 00:03:21,290 So now if I run my project as you can see it decrements this value by 1. 57 00:03:21,350 --> 00:03:21,950 OK. 58 00:03:22,040 --> 00:03:26,350 Decremented the value of this variable which is number 30 by 1. 59 00:03:26,510 --> 00:03:27,130 OK. 60 00:03:27,350 --> 00:03:29,110 So this is our value. 61 00:03:29,180 --> 00:03:36,620 So what's the difference between actually putting these operators after or before the variable name. 62 00:03:36,830 --> 00:03:42,430 In simple expressions such as these expressions as you can see it doesn't make any difference OK. 63 00:03:42,650 --> 00:03:47,910 But in larger expressions it's going to be it's going to actually make a huge difference. 64 00:03:47,930 --> 00:03:48,440 OK. 65 00:03:48,680 --> 00:03:54,510 So now let me show you some real examples in order to make this concept more clear for you. 66 00:03:54,560 --> 00:03:55,090 OK. 67 00:03:55,280 --> 00:04:01,860 So increment and decrement operators are called prefix operators. 68 00:04:01,880 --> 00:04:08,250 If listed before the variable name and postfix operators if listed after a value of a name. 69 00:04:08,270 --> 00:04:09,000 OK. 70 00:04:09,410 --> 00:04:17,870 So as you can see here in this example as you can see this increment operator is called prefix operator 71 00:04:18,350 --> 00:04:22,980 and this decrement operator here is called prefix operator. 72 00:04:23,240 --> 00:04:33,710 And in this example for example this increment operator is called postfix operator and these decrement 73 00:04:33,710 --> 00:04:36,200 operator is called postfix. 74 00:04:36,200 --> 00:04:37,480 OPERATOR OK. 75 00:04:37,580 --> 00:04:40,620 So now let me actually show you some real examples. 76 00:04:40,640 --> 00:04:41,260 OK. 77 00:04:41,420 --> 00:04:44,420 So first I'm going to actually create some variables here. 78 00:04:44,480 --> 00:04:48,130 So are the Data Type of my first Raddy is it. 79 00:04:48,380 --> 00:04:53,230 And the name of my first variable is for example first value. 80 00:04:53,240 --> 00:04:54,110 OK. 81 00:04:54,660 --> 00:04:55,320 Okay. 82 00:04:55,610 --> 00:04:58,400 And then I assign no value to my valuable here. 83 00:04:58,400 --> 00:04:59,060 OK. 84 00:04:59,390 --> 00:05:09,930 And then again the Data Type of my variable is in the name of my variable is second variable OK. 85 00:05:10,470 --> 00:05:17,400 And again I want to create another variable data type of data type of my valuable is it. 86 00:05:17,580 --> 00:05:21,390 And the name of my is for value it. 87 00:05:21,870 --> 00:05:22,770 OK. 88 00:05:23,370 --> 00:05:25,930 And then I assign no value to my variable here. 89 00:05:26,010 --> 00:05:30,940 OK so now I want to actually give my first value a bad value. 90 00:05:31,140 --> 00:05:37,440 So I just need to refer to the name of my first variable and then I assign a value to my variable for 91 00:05:37,440 --> 00:05:38,830 example number 30. 92 00:05:38,940 --> 00:05:39,680 OK. 93 00:05:39,990 --> 00:05:43,330 And then at the end of my statement I need to put in a semicolon. 94 00:05:43,530 --> 00:05:48,560 So now I want to output the value of this variable to the cancer OK. 95 00:05:48,650 --> 00:05:54,410 And then inside the prentices I need to refer to the name of my variable and then at the end of my statement 96 00:05:54,440 --> 00:05:55,810 I need to put in a semicolon. 97 00:05:55,820 --> 00:05:56,280 OK. 98 00:05:56,570 --> 00:06:02,450 So now if I write on my project as you can see it's going output the value of this first variable to 99 00:06:02,450 --> 00:06:03,360 the console OK. 100 00:06:03,410 --> 00:06:07,900 So now I'm going to actually assign a value to my second variable. 101 00:06:07,910 --> 00:06:08,750 OK. 102 00:06:09,050 --> 00:06:16,610 So I just need to refer to the name of my second variable and then I want to assign the value of this 103 00:06:16,610 --> 00:06:19,430 first variable to my second variable. 104 00:06:19,640 --> 00:06:24,980 So now I want to actually assign a value to my second variable here. 105 00:06:24,980 --> 00:06:25,440 OK. 106 00:06:25,520 --> 00:06:33,110 So I want to assign the value of this first valuable ok to my second variable. 107 00:06:33,230 --> 00:06:40,010 So in order to assign the value of my first Avari Abella to my second variable i just need to refer 108 00:06:40,010 --> 00:06:42,260 to the name of my first variable. 109 00:06:42,520 --> 00:06:43,140 OK. 110 00:06:43,190 --> 00:06:46,040 In order to read it's value OK. 111 00:06:46,580 --> 00:06:50,380 And at the end of my statement I just need to put a semicolon OK. 112 00:06:50,720 --> 00:06:57,650 So now if I want to actually output the value of the second variable to the console I just need to actually 113 00:06:57,650 --> 00:07:03,260 type in a system that's out that insulin. 114 00:07:04,640 --> 00:07:10,290 And then inside Apprentice's I just need to refer to the name of my second variable. 115 00:07:10,590 --> 00:07:14,740 And at the end of my statement I need to put in a semicolon OK. 116 00:07:15,020 --> 00:07:23,330 So now if I actually run my project as I can see again it's going to output this this number 40 to the 117 00:07:23,330 --> 00:07:23,900 console. 118 00:07:23,990 --> 00:07:24,570 OK. 119 00:07:24,740 --> 00:07:27,730 So this value is the value of the first value of it. 120 00:07:27,830 --> 00:07:28,310 OK. 121 00:07:28,430 --> 00:07:34,030 And we assigned the value of the first variable to my second variable. 122 00:07:34,220 --> 00:07:34,830 Okay. 123 00:07:35,150 --> 00:07:41,820 And in line 47 We decided to output the value of the second variable to the OK. 124 00:07:41,840 --> 00:07:43,490 As you can see here. 125 00:07:43,490 --> 00:07:48,300 So now I want to actually assign a value to my first variable OK. 126 00:07:48,320 --> 00:07:52,310 So again I just need to refer to the name of my first variable. 127 00:07:52,790 --> 00:07:59,070 As you can see here and then again are you want to assign the value of the first variable. 128 00:07:59,150 --> 00:08:02,990 As you can see here the value of the first variable is 40. 129 00:08:02,990 --> 00:08:03,520 OK. 130 00:08:03,740 --> 00:08:05,180 To my first value. 131 00:08:05,270 --> 00:08:06,230 OK. 132 00:08:06,230 --> 00:08:11,730 So I just need to refer to the name of my first variable in order to read its value. 133 00:08:11,860 --> 00:08:12,660 Okay. 134 00:08:12,710 --> 00:08:16,920 And then at the end of my statement I need to put a semi-colon OK. 135 00:08:17,480 --> 00:08:22,970 So now I want to actually output the value of this first variable to the console. 136 00:08:23,150 --> 00:08:30,470 So just type in here a system that out that Prensa learn and then inside Apprentice's. 137 00:08:30,650 --> 00:08:36,950 I just need to refer to the name of my first variable and then at the end of my statement I just need 138 00:08:36,950 --> 00:08:38,980 to put a semi-colon OK. 139 00:08:39,070 --> 00:08:45,140 So now if I run my project as you can see again it's going to output this value. 140 00:08:45,260 --> 00:08:46,960 This number for the concert. 141 00:08:46,970 --> 00:08:55,420 Ok this value is the value of the first variable as we assign a value to this variable in line 44. 142 00:08:55,460 --> 00:08:56,080 OK. 143 00:08:56,480 --> 00:09:05,960 We assigned a value to this first variable in line 44 and in line 45 we decided to output the value 144 00:09:05,960 --> 00:09:08,020 of this first variable to the console. 145 00:09:08,300 --> 00:09:13,670 So as you can see here this value is the result of execution of this line of code here. 146 00:09:13,780 --> 00:09:22,460 We decided to output the value of this first variable to the console and in line 46 I actually assigned 147 00:09:22,900 --> 00:09:30,590 a value to my second value and I assigned the value of the first variable to my second variable and 148 00:09:30,680 --> 00:09:37,650 in line 47 I decided to output the value of the second variable to the console. 149 00:09:37,670 --> 00:09:44,660 So as you can see here a decent value here this number 40 is the result of execution of this line of 150 00:09:44,660 --> 00:09:45,210 code here. 151 00:09:45,230 --> 00:09:46,260 Okay. 152 00:09:46,740 --> 00:09:54,550 And line 48 I decided to actually assign a value to my first variable.