1 00:00:00,850 --> 00:00:04,810 Let me actually run my project and see what happens. 2 00:00:04,820 --> 00:00:09,800 So as you can see here it outputs this value to the console. 3 00:00:09,920 --> 00:00:13,440 This is the value of they can buy a car valuable farts. 4 00:00:13,460 --> 00:00:18,450 So as you can see this is the value of my Channa by car value. 5 00:00:18,460 --> 00:00:18,790 OK. 6 00:00:18,800 --> 00:00:20,180 False. 7 00:00:20,210 --> 00:00:25,800 So as you can see here I assigned the value of dollars to my can buy a car variable here. 8 00:00:25,820 --> 00:00:26,670 OK. 9 00:00:27,080 --> 00:00:33,190 And in like 24 I decided to output the value of this variable to the console. 10 00:00:33,440 --> 00:00:34,410 As you can see here. 11 00:00:34,520 --> 00:00:35,230 OK. 12 00:00:35,720 --> 00:00:41,780 So now I want to actually combine expressions together so let's see how we can do that in the previous 13 00:00:41,780 --> 00:00:49,600 example we just created one expression and we assigned the value of this expression to our boolean variable 14 00:00:49,610 --> 00:00:49,870 here. 15 00:00:49,920 --> 00:00:56,660 OK but now I want to actually combine two or three or four expressions together and then assign the 16 00:00:56,660 --> 00:00:59,560 value of those expressions to my variable. 17 00:00:59,570 --> 00:01:01,370 So let's see how we can do that. 18 00:01:01,370 --> 00:01:04,700 You can actually combine unlimited expressions together. 19 00:01:04,700 --> 00:01:05,310 OK. 20 00:01:05,480 --> 00:01:14,060 So now as you can see I want to assign another value to my can by car variable that I created in line 21 00:01:14,180 --> 00:01:18,010 23 can buy car. 22 00:01:18,200 --> 00:01:18,910 OK. 23 00:01:19,340 --> 00:01:25,370 And now I want to combine expressions together and then assign the value of those expressions to my 24 00:01:25,370 --> 00:01:26,580 Tran by card value. 25 00:01:26,600 --> 00:01:27,110 OK. 26 00:01:27,290 --> 00:01:30,890 So now I just need to put emphasis here. 27 00:01:31,340 --> 00:01:34,820 And that inside Apprentice's I want to create an expression. 28 00:01:34,820 --> 00:01:42,720 For example the value of my money valuable is greater than 500. 29 00:01:43,070 --> 00:01:43,620 OK. 30 00:01:43,800 --> 00:01:48,020 So and now I want to actually create another expression how I can do that. 31 00:01:48,020 --> 00:01:53,570 I cannot actually put another emphasis here and then put another explosion inside Apprentice's for example 32 00:01:53,570 --> 00:01:55,700 money is less than 50. 33 00:01:55,740 --> 00:01:56,280 OK. 34 00:01:56,330 --> 00:01:59,070 And put a semicolon at the end of my statement. 35 00:01:59,090 --> 00:02:02,140 So as you can see here is now showing us an error. 36 00:02:02,160 --> 00:02:06,230 Ok it cannot handle this value for us. 37 00:02:06,230 --> 00:02:13,370 So how we can actually deal with this problem we cannot actually put these two expressions together 38 00:02:13,970 --> 00:02:17,790 here and then assign the value of these two expressions to my variable. 39 00:02:17,960 --> 00:02:22,100 So the solution is to use logical operators. 40 00:02:22,490 --> 00:02:29,870 OK this is very important in programming that you should know how to use these logical operators in 41 00:02:29,870 --> 00:02:30,720 your programs. 42 00:02:30,820 --> 00:02:34,340 OK so now you want to actually use the and operator. 43 00:02:34,460 --> 00:02:41,720 So in order to actually use the and operator and combine two expressions together I just need to put 44 00:02:42,060 --> 00:02:46,040 2 and percent symbols between my expressions. 45 00:02:46,070 --> 00:02:46,630 OK. 46 00:02:46,760 --> 00:02:52,840 So as you can see here I put two ampersand symbols between my expressions. 47 00:02:52,910 --> 00:02:57,560 OK so what's the meaning of these two ampersand symbols here. 48 00:02:58,160 --> 00:03:05,990 I am telling the computer that the value of this money valuable must be greater than 500 in order to 49 00:03:05,990 --> 00:03:09,000 evaluate this expression to true. 50 00:03:09,310 --> 00:03:09,950 OK. 51 00:03:10,250 --> 00:03:14,640 So as you can see here the value of my money variable is 100 OK. 52 00:03:14,840 --> 00:03:18,060 And it is not greater than 500. 53 00:03:18,250 --> 00:03:18,710 OK. 54 00:03:18,830 --> 00:03:20,790 So it is less than 500. 55 00:03:20,790 --> 00:03:22,910 One hundred is less than 500. 56 00:03:22,910 --> 00:03:23,580 OK. 57 00:03:23,930 --> 00:03:28,020 So the value of this expression evaluates to false. 58 00:03:28,220 --> 00:03:31,190 So let me actually create a comment here for fots. 59 00:03:31,270 --> 00:03:32,280 OK. 60 00:03:32,930 --> 00:03:43,580 And here as you can see in this expression I am telling the computer that the value of the money variable 61 00:03:43,670 --> 00:03:46,380 must be less than 50 here. 62 00:03:46,490 --> 00:03:47,930 It doesn't make any sense. 63 00:03:47,930 --> 00:03:53,260 So let me actually change this value to 1000 for example. 64 00:03:53,660 --> 00:04:02,310 And here I am telling the computer that the value of the money variable must be less than 1000. 65 00:04:02,330 --> 00:04:02,920 OK. 66 00:04:03,320 --> 00:04:10,580 So as you can see here the value of my money value bet is 100 and it is less than 1000. 67 00:04:10,610 --> 00:04:14,610 So the value of the expression evaluates to TRUE. 68 00:04:15,500 --> 00:04:16,150 OK. 69 00:04:16,370 --> 00:04:21,890 So now Lydney actually outputs the value of this variable to the console and let's see what happens. 70 00:04:22,220 --> 00:04:28,340 So just typing here system that out that princeling. 71 00:04:28,850 --> 00:04:36,830 And then inside the apprentice's I just need to refer to the name of my variable can by car. 72 00:04:37,220 --> 00:04:37,910 OK. 73 00:04:38,420 --> 00:04:42,520 And then at the end of my statement I need to put in a semi-colon OK. 74 00:04:43,070 --> 00:04:53,100 So if I actually run my project as you can see the value of MY can buy charivari about is false here. 75 00:04:53,390 --> 00:05:00,330 OK so now let me actually comment out these lines of code here because I don't want to execute them. 76 00:05:00,410 --> 00:05:02,290 So if I run my project again. 77 00:05:02,330 --> 00:05:08,600 So as you can see it outputs the value of my can buy car valuable to the console for us. 78 00:05:08,750 --> 00:05:10,450 So let's see what's going on here. 79 00:05:10,940 --> 00:05:15,390 As you can see the value of this expression evaluates to false. 80 00:05:15,390 --> 00:05:15,890 Okay. 81 00:05:16,250 --> 00:05:19,440 And the value of the expression evaluates to TRUE. 82 00:05:19,820 --> 00:05:20,600 Okay. 83 00:05:20,940 --> 00:05:29,000 But because we are using the and operator here the value of these two expressions must evaluate to true 84 00:05:29,540 --> 00:05:38,360 in order to evaluate the value of the entire expression to true the value of this expression is false 85 00:05:38,810 --> 00:05:41,820 here and the value of this expression is true. 86 00:05:42,170 --> 00:05:50,330 The value of the entire expression evaluates to false and that false value will be assigned to or can 87 00:05:50,330 --> 00:05:51,370 buy Karadi of it. 88 00:05:51,460 --> 00:05:58,670 OK but so now as you can see the value of all can buy called variable is false. 89 00:05:58,790 --> 00:06:07,610 If you want to for example change the value of my money variable to 600 and if I run my project as you 90 00:06:07,610 --> 00:06:13,250 can see the value of my entire expression evaluates to true. 91 00:06:13,550 --> 00:06:16,550 So now this expression evaluates to TRUE. 92 00:06:16,790 --> 00:06:17,670 OK. 93 00:06:18,170 --> 00:06:24,960 The value of my entire expression evaluates to true and this value is now out to the council. 94 00:06:25,000 --> 00:06:25,490 Okay. 95 00:06:25,610 --> 00:06:29,180 So let me actually explain to you what's going on here. 96 00:06:29,230 --> 00:06:35,680 Here this expression evaluates to true because the value of the money value is greater than 500. 97 00:06:35,720 --> 00:06:39,530 And as you can see I am using the and logical operator here. 98 00:06:39,540 --> 00:06:40,360 OK. 99 00:06:41,060 --> 00:06:46,680 And the value of my money valuable is less than one thousand. 100 00:06:46,910 --> 00:06:47,550 OK. 101 00:06:47,840 --> 00:06:53,550 As you can see the value of my money variable is 600 and it is less than 1000. 102 00:06:53,720 --> 00:06:58,570 So the value of the entire expression evaluates to TRUE. 103 00:06:59,120 --> 00:06:59,930 Okay. 104 00:07:00,470 --> 00:07:05,440 So as you can see in the console the value of my entire expression evaluates to TRUE. 105 00:07:05,480 --> 00:07:06,000 Okay. 106 00:07:06,290 --> 00:07:15,010 But if I change the value of my money variable to 400 OK the value of this expression evaluates to false 107 00:07:15,020 --> 00:07:15,850 again. 108 00:07:16,300 --> 00:07:16,820 OK. 109 00:07:16,970 --> 00:07:17,340 Why. 110 00:07:17,360 --> 00:07:22,330 Because the value of the money variable is less than 500. 111 00:07:22,480 --> 00:07:31,130 OK here I am telling the computer that the value of the money variable must be greater than 500 in order 112 00:07:31,370 --> 00:07:35,280 to actually evaluate the value of the expression to true. 113 00:07:35,300 --> 00:07:43,040 But because the value of the money value is less than 500 as you can see here the value of the expression 114 00:07:43,040 --> 00:07:44,660 evaluates to false. 115 00:07:44,930 --> 00:07:45,610 OK. 116 00:07:46,010 --> 00:07:54,830 And because I am using the ant logical operator here the value of these two expressions must evaluate 117 00:07:54,830 --> 00:08:01,200 to true in order to actually evaluate the entire expression total. 118 00:08:01,400 --> 00:08:06,530 So as you can see in the console the value of my Chan by charivari about is false. 119 00:08:06,550 --> 00:08:07,100 Okay. 120 00:08:07,220 --> 00:08:12,110 And if I for example want to actually put another expression here. 121 00:08:12,170 --> 00:08:18,530 I just need to put him into ampersands and here I can actually put my statement inside Apprentice's 122 00:08:19,030 --> 00:08:20,690 money. 123 00:08:20,810 --> 00:08:24,710 For example less than 900. 124 00:08:25,200 --> 00:08:25,920 OK. 125 00:08:26,150 --> 00:08:33,300 And here I am telling the computer that the value of the money variable must be less than 100. 126 00:08:33,320 --> 00:08:33,700 OK. 127 00:08:33,710 --> 00:08:38,860 In order to actually evaluate the value of this expression to true. 128 00:08:38,900 --> 00:08:39,570 OK. 129 00:08:40,070 --> 00:08:48,710 So now if I run my project as you can see it is false the value of the expression is true because the 130 00:08:48,710 --> 00:08:54,150 value of that money variable is 400 and it is less than 900. 131 00:08:54,170 --> 00:09:01,270 OK so this expression evaluates to true but this expression evaluates to false because we are using 132 00:09:01,450 --> 00:09:09,500 and logical operators here and here the value of these free expressions must be true in order to actually 133 00:09:09,500 --> 00:09:12,300 evaluate the entire expression to true. 134 00:09:12,470 --> 00:09:13,820 OK. 135 00:09:13,820 --> 00:09:22,550 So as you can see if I actually change the value of this value about 2 for example 700 and if I run 136 00:09:22,550 --> 00:09:27,510 my project again the value of my can by car variable evaluates to TRUE. 137 00:09:27,580 --> 00:09:28,120 OK. 138 00:09:28,340 --> 00:09:31,880 Because the entire expression now evaluates to true. 139 00:09:32,150 --> 00:09:33,940 This expression evaluates to true. 140 00:09:34,100 --> 00:09:36,730 This expression evaluates to true as you can see here. 141 00:09:36,950 --> 00:09:38,990 And this expression evaluates to TRUE. 142 00:09:39,080 --> 00:09:39,960 OK. 143 00:09:40,280 --> 00:09:44,710 So now let me actually show you another example about using the OR. 144 00:09:44,720 --> 00:09:46,600 Operator OK. 145 00:09:47,420 --> 00:09:51,370 So let me actually comment out these lines of code here. 146 00:09:52,220 --> 00:09:52,700 OK.