1 00:00:00,240 --> 00:00:07,470 So if actually putting a value here for example Number 20 Let's see what happens and then click on this. 2 00:00:07,470 --> 00:00:09,210 Show me the results button here. 3 00:00:09,240 --> 00:00:15,120 So as you can see here it says The value is not 51 and the value is 20. 4 00:00:15,350 --> 00:00:15,960 OK. 5 00:00:15,960 --> 00:00:22,890 So let's actually change these value to another value for example number 51 and then click on this. 6 00:00:22,890 --> 00:00:24,500 Show me the results button here. 7 00:00:24,540 --> 00:00:25,770 So it says 51. 8 00:00:25,770 --> 00:00:26,750 Great. 9 00:00:26,760 --> 00:00:29,940 So it did actually execute these lines of code here. 10 00:00:29,940 --> 00:00:30,450 OK. 11 00:00:30,600 --> 00:00:37,170 So if the value of these are textfield value actually contains this number it's going to actually execute 12 00:00:37,170 --> 00:00:38,100 this line of code here. 13 00:00:38,100 --> 00:00:38,550 OK. 14 00:00:38,700 --> 00:00:40,820 Textfield plus great. 15 00:00:40,840 --> 00:00:42,790 So 51 spacecraft. 16 00:00:43,080 --> 00:00:50,820 And if the value of these are textfield here actually doesn't contain this number here and it it may 17 00:00:50,820 --> 00:00:53,410 contain actually other values or any value. 18 00:00:53,580 --> 00:00:57,700 It's going to actually execute this line of code inside of these else statement here. 19 00:00:57,720 --> 00:00:58,450 OK. 20 00:00:58,650 --> 00:01:04,420 If textfield value that contains 51 is going to execute this line of code here. 21 00:01:04,680 --> 00:01:08,340 But illis and this means anything else. 22 00:01:08,340 --> 00:01:08,750 OK. 23 00:01:08,880 --> 00:01:15,240 If anything else happens if we actually putting any value here it's going to actually execute this line 24 00:01:15,240 --> 00:01:15,830 of code. 25 00:01:16,020 --> 00:01:16,540 OK. 26 00:01:16,710 --> 00:01:23,910 So let's actually delete this 51 and we can actually put in another value for example number 80 and 27 00:01:24,390 --> 00:01:30,860 click on this show me there is at the bottom here and it says The value is not 51 and the value is 80. 28 00:01:31,010 --> 00:01:31,690 OK. 29 00:01:31,710 --> 00:01:33,220 So hopefully that makes sense. 30 00:01:33,330 --> 00:01:37,870 OK so now let's actually go back inside this main activity class here. 31 00:01:38,160 --> 00:01:44,880 And let's actually as you can see here we've got some duplicated Kautsky or KTXA result set text and 32 00:01:44,930 --> 00:01:46,890 TXI the result that said text. 33 00:01:46,890 --> 00:01:47,430 OK. 34 00:01:47,700 --> 00:01:56,170 So we can actually create only one line of code that actually says X degrees and that set text OK. 35 00:01:56,250 --> 00:01:59,030 So there is a solution for this problem here OK. 36 00:01:59,100 --> 00:02:04,020 I don't like actually producing duplicated code in in my program. 37 00:02:04,080 --> 00:02:04,550 OK. 38 00:02:04,680 --> 00:02:07,950 Because that may actually result in bugs. 39 00:02:07,950 --> 00:02:15,100 So in order to solve this problem we can actually create a strange object here named result. 40 00:02:15,620 --> 00:02:16,110 OK. 41 00:02:16,230 --> 00:02:20,920 And then we need to actually assign a value to these valuable here. 42 00:02:20,940 --> 00:02:21,550 OK. 43 00:02:21,680 --> 00:02:23,450 Or an empty variable is enough. 44 00:02:23,550 --> 00:02:24,140 OK. 45 00:02:24,480 --> 00:02:27,810 If you want to you can actually not to assign any value to this variable. 46 00:02:28,020 --> 00:02:32,240 And here we can actually comment out these lines of code here. 47 00:02:32,760 --> 00:02:33,110 OK. 48 00:02:33,120 --> 00:02:41,550 Because I want to show you an important point here and now I can actually assign these values to this 49 00:02:41,870 --> 00:02:42,990 string object here. 50 00:02:42,990 --> 00:02:45,530 OK so I can't just type in here result. 51 00:02:45,820 --> 00:02:53,270 Assignment operator and then I can actually refer to the name of this textfield value object plus. 52 00:02:53,280 --> 00:02:55,980 And then I can actually put into double quotes space. 53 00:02:56,190 --> 00:02:57,280 Great. 54 00:02:57,960 --> 00:02:58,440 OK. 55 00:02:58,440 --> 00:03:05,710 And here again I can actually refer to the name of this result variable result assignment operator. 56 00:03:05,910 --> 00:03:10,130 And then I can actually assign this value to my result variable. 57 00:03:10,140 --> 00:03:10,610 OK. 58 00:03:10,620 --> 00:03:16,680 So as you can see here this result valuable is actually a local variable OK a local variable is a value 59 00:03:16,700 --> 00:03:19,360 but that is actually declared inside of the method. 60 00:03:19,440 --> 00:03:29,700 OK so now as you can see after this if else statement here I can just type in here X the result that 61 00:03:30,120 --> 00:03:37,320 said text and then inside Apprentice's I can just refer to the name of this resolved value. 62 00:03:37,410 --> 00:03:41,250 OK so now let's actually run our project and see what happens. 63 00:03:41,250 --> 00:03:48,420 So now as you can see here I can actually enter a number here for example number 27 and if I click on 64 00:03:48,420 --> 00:03:56,550 the spot in here show me the result as you can see it says the value is not 51 and the value is 27. 65 00:03:56,580 --> 00:03:58,690 So now let's actually did it this value here. 66 00:03:58,710 --> 00:04:04,020 And let's actually put the number 51 here and it says again 51. 67 00:04:04,020 --> 00:04:05,020 Great. 68 00:04:05,070 --> 00:04:05,730 OK. 69 00:04:05,730 --> 00:04:11,280 So as you can see here in this way all our codes are actually more maintainable. 70 00:04:11,280 --> 00:04:13,200 This is a very professional way. 71 00:04:13,380 --> 00:04:15,020 In order to write your code here. 72 00:04:15,090 --> 00:04:15,490 OK. 73 00:04:15,570 --> 00:04:19,260 So now let me actually comment out this if else statement here. 74 00:04:19,350 --> 00:04:22,680 And now let me actually create another if else statements. 75 00:04:22,710 --> 00:04:29,610 So if and then inside the prentices I can actually specify an expression that actually results in a 76 00:04:29,640 --> 00:04:32,410 true all of or a false value. 77 00:04:32,700 --> 00:04:34,100 So I can just type in here. 78 00:04:34,260 --> 00:04:40,980 Textfield value that as you can see here we can actually call D. 79 00:04:41,010 --> 00:04:43,550 All of these methods on our object here. 80 00:04:43,550 --> 00:04:43,940 OK. 81 00:04:43,980 --> 00:04:45,110 So as you can see here Chad. 82 00:04:45,120 --> 00:04:46,620 At what point add. 83 00:04:46,890 --> 00:04:48,400 And lots of other methods. 84 00:04:48,420 --> 00:04:49,130 OK. 85 00:04:49,440 --> 00:04:57,150 So here I can't I just want to actually use that contains Meffert contains and in say the apprentice's. 86 00:04:57,340 --> 00:04:59,850 I can just put in a value for example. 87 00:05:00,330 --> 00:05:02,480 Number 90. 88 00:05:02,580 --> 00:05:03,240 OK. 89 00:05:03,480 --> 00:05:09,270 And then I need to actually open and close my statement by using these curly braces. 90 00:05:09,300 --> 00:05:16,460 So here I am saying that if the value of these textfield value object actually contains number of any 91 00:05:16,560 --> 00:05:23,430 number 90 I want to actually assign a value to this result local variable. 92 00:05:23,430 --> 00:05:24,510 I think as you can see here. 93 00:05:24,510 --> 00:05:25,020 OK. 94 00:05:25,230 --> 00:05:26,260 So result. 95 00:05:26,550 --> 00:05:34,250 And then inside double quotes and just putting in your grade is a. 96 00:05:34,660 --> 00:05:42,120 OK you're great is eight and your number is. 97 00:05:42,680 --> 00:05:48,040 For example I can actually refer to the name of this textfield value here. 98 00:05:48,080 --> 00:05:48,700 OK. 99 00:05:49,100 --> 00:05:52,440 And then I can actually put a semi-colon at the end of my statement. 100 00:05:52,760 --> 00:06:00,220 So now at the end of this statement here I can just type in Ellis if and as you can see here I am actually 101 00:06:00,240 --> 00:06:02,870 using an if statement here this thing. 102 00:06:02,930 --> 00:06:03,510 OK. 103 00:06:03,800 --> 00:06:10,160 So here I am actually specifying that if the value of these takes feel valued doesn't contain the number 104 00:06:10,170 --> 00:06:17,330 90 and it does contain other value for example it may actually contain number 80. 105 00:06:17,330 --> 00:06:19,250 OK that contains. 106 00:06:19,250 --> 00:06:21,840 And then here I can actually specify number 80. 107 00:06:22,430 --> 00:06:28,620 And this time I want to actually assign another value to this result local variable. 108 00:06:28,640 --> 00:06:29,080 OK. 109 00:06:29,150 --> 00:06:35,680 So inside the double calls I can just type in your grade is B and your number is textfield value. 110 00:06:36,860 --> 00:06:43,390 And here I can actually create another LC statement here and then inside the. 111 00:06:43,730 --> 00:06:50,750 I can just refer to the name of this text field text field value that contains and that in say the prentices 112 00:06:50,780 --> 00:06:57,760 I can actually specify that the value of these textfield value may contain number 70. 113 00:06:58,010 --> 00:07:03,630 So I can actually open and close this elusive statement here by using these curly braces. 114 00:07:03,830 --> 00:07:09,380 And then I can actually assign another value to this result local variable. 115 00:07:09,530 --> 00:07:22,400 So I can't just type in your grade is c and your number is textfield value. 116 00:07:22,660 --> 00:07:27,260 OK and now again I can actually create another LCF statement here. 117 00:07:27,380 --> 00:07:32,190 I can actually create unlimited numbers of LCF statements that I want. 118 00:07:32,380 --> 00:07:32,920 OK. 119 00:07:33,140 --> 00:07:39,880 So elusive textfield value that contains number 60. 120 00:07:40,440 --> 00:07:41,010 OK. 121 00:07:41,240 --> 00:07:46,640 So here I can just assign another value with this result variable. 122 00:07:46,640 --> 00:07:54,320 So I can just type in your grade is F and 123 00:07:57,070 --> 00:08:02,590 number is textfield value. 124 00:08:02,760 --> 00:08:03,410 OK. 125 00:08:03,730 --> 00:08:12,370 And now I can actually create an statement here in order to actually specify that if the value of this 126 00:08:12,370 --> 00:08:17,380 text we are right you object doesn't actually contain any of any of these numbers. 127 00:08:17,380 --> 00:08:20,010 1980 76 the. 128 00:08:20,200 --> 00:08:23,980 I can actually specify that the value of this is aren't malleable is. 129 00:08:24,010 --> 00:08:33,680 For example you are not sufficient so hopefully that makes sense. 130 00:08:33,910 --> 00:08:37,460 And let's actually run our project and see what happens. 131 00:08:37,460 --> 00:08:42,090 So now as you can see here our application is actually running on the emulator. 132 00:08:42,320 --> 00:08:49,310 And now for example if I were to enter the value 90 here inside this textfield and if I click on the 133 00:08:49,310 --> 00:08:51,660 spot in here let's see what happens. 134 00:08:51,740 --> 00:08:56,150 Now it says your grade is a and your number is 90 right. 135 00:08:56,150 --> 00:09:01,850 So as you can see here in this code we created an if statement and it says if these tapes fill here 136 00:09:01,880 --> 00:09:07,540 textfield value as you can see here that contains number 90 as you can see here. 137 00:09:07,680 --> 00:09:10,580 Right then we're going to assign the value. 138 00:09:10,790 --> 00:09:13,790 We are going to actually assign a value to the result variable. 139 00:09:13,800 --> 00:09:14,110 Right. 140 00:09:14,120 --> 00:09:16,260 Which is of types 3 as you can see here. 141 00:09:16,300 --> 00:09:21,310 So result assignment operator and then here we are inside the double quotes. 142 00:09:21,320 --> 00:09:22,750 We actually put this value. 143 00:09:22,790 --> 00:09:29,740 Your grade is a and your number is as you can see here your grade is a and your number is Plus textfield 144 00:09:29,780 --> 00:09:30,170 value. 145 00:09:30,170 --> 00:09:33,050 So here we are actually getting the value of this text field. 146 00:09:33,080 --> 00:09:34,550 90 right. 147 00:09:36,850 --> 00:09:41,100 And for example as you can see we actually created another elusive statement. 148 00:09:41,100 --> 00:09:46,530 And here we are saying that else it takes real value that contains number 80 then it's going to actually 149 00:09:46,560 --> 00:09:48,960 assign this value as you can see here to this result. 150 00:09:48,990 --> 00:09:52,620 So your grade is B and your number is takes with value. 151 00:09:52,620 --> 00:09:57,980 So now let's actually change this value to number 80 and click on this button here. 152 00:09:57,990 --> 00:10:02,260 Now it says your grade is B and your number is 80 right. 153 00:10:02,650 --> 00:10:06,900 And now as you can see here we are checking these are conditions here right. 154 00:10:06,900 --> 00:10:10,140 For example number 90 80 76. 155 00:10:10,280 --> 00:10:16,500 So let's actually put an order number for example number 85 and let's click on this button here. 156 00:10:16,590 --> 00:10:18,560 Now it says you are not sufficient. 157 00:10:18,570 --> 00:10:25,230 So now we actually created an else statement here and here we are saying that if these other conditions 158 00:10:25,260 --> 00:10:29,580 above are not true then it's going to actually execute this statement. 159 00:10:29,610 --> 00:10:35,160 So because we actually entered a value that we didn't actually check in say these if else statements 160 00:10:35,160 --> 00:10:43,890 here as you can see we only checked for number 90 80 70 60 right and we didn't actually create actually 161 00:10:43,890 --> 00:10:46,320 a control statement for number 85. 162 00:10:46,350 --> 00:10:46,980 Right. 163 00:10:46,980 --> 00:10:49,990 So in that case it's going to execute this statement. 164 00:10:50,190 --> 00:10:56,970 So this was a statement he had means that he's going to execute this statement if the conditions above 165 00:10:57,120 --> 00:10:58,040 is not true. 166 00:10:58,170 --> 00:10:58,410 OK. 167 00:10:58,410 --> 00:11:00,680 If the conditions above are not true so. 168 00:11:00,710 --> 00:11:05,520 Else and it's going to go inside the curly braces of this statement and it's going to assign this value 169 00:11:05,540 --> 00:11:10,490 you are not sufficient to this result and it's going as you can see here we are saying that he likes 170 00:11:10,520 --> 00:11:11,430 the result. 171 00:11:11,450 --> 00:11:13,040 That's the Tillich's result. 172 00:11:13,140 --> 00:11:13,820 Right. 173 00:11:14,120 --> 00:11:17,310 And now as you can see it says you are not sufficient. 174 00:11:17,640 --> 00:11:22,890 So hopefully that makes sense and if you have any questions about these if statements please post the 175 00:11:22,890 --> 00:11:26,880 discussion in the course and then I'll do my best to answer all of your questions.