WEBVTT 1 00:00.980 --> 00:01.550 Welcome back. 2 00:01.550 --> 00:08.750 So now we are going to continue tracing the fifth character, which is this character. 3 00:08.780 --> 00:09.800 Fifth character. 4 00:09.920 --> 00:12.380 So you got the first four characters we fished out. 5 00:12.380 --> 00:15.380 So we're going to restart this, and we have just restarted. 6 00:15.380 --> 00:18.710 And now we are going to run and hit our main again. 7 00:22.390 --> 00:24.040 And now we're going to step over. 8 00:29.040 --> 00:32.880 Until we come to this call, and we step over. 9 00:32.880 --> 00:36.660 This is the if, then waits for our input. 10 00:37.650 --> 00:43.260 Now we are going to enter the first four characters which we have successfully fished out, which 11 00:43.260 --> 00:44.760 is L-I-L-2. 12 00:45.720 --> 00:50.250 So we type L-I-L-2. 13 00:50.760 --> 00:56.220 And then the fifth character, we don't know the password, so we just put 5, 6, 7, 8, 14 00:56.220 --> 00:57.750 9, hit Enter. 15 00:58.350 --> 00:59.790 So it comes back here. 16 00:59.790 --> 01:02.850 And now we step over until we come to this call. 17 01:02.850 --> 01:04.740 And we step into this call. 18 01:07.920 --> 01:08.490 Click again. 19 01:08.490 --> 01:12.150 And now we right-click and graph it, and we trace it. 20 01:13.290 --> 01:14.610 Same way we have been doing. 21 01:16.590 --> 01:19.500 So this one is the first character, L. 22 01:23.310 --> 01:25.470 This one is the second character, which is I. 23 01:30.410 --> 01:33.680 This one is the third character, which is L again, remember? 24 01:33.710 --> 01:35.660 L-I-L, L-I-L. 25 01:35.660 --> 01:36.020 And then. 26 01:36.020 --> 01:37.190 Now continue. 27 01:42.750 --> 01:46.710 And this one is the fourth character, which is 2. 28 01:47.010 --> 01:47.580 Over here. 29 01:47.610 --> 01:48.540 L-I-L-2. 30 01:50.360 --> 01:51.770 And let's come down here. 31 01:54.800 --> 01:58.340 So now is adding 4 to the counter. 32 01:58.460 --> 02:04.070 - and - are counters, so it goes up to the next loop. 33 02:05.120 --> 02:08.090 See, there's a loop here from here and goes back up. 34 02:08.480 --> 02:11.960 Continue with the loop with the new value for the counter. 35 02:12.230 --> 02:13.190 So we step over. 36 02:13.190 --> 02:15.950 Now it comes back up here. - is now 4. 37 02:19.780 --> 02:20.740 He's going to move. 38 02:20.770 --> 02:21.820 He's going to move. 39 02:21.820 --> 02:24.100 Uh, - is now 4. 40 02:24.460 --> 02:26.080 So let's step over. 41 02:26.830 --> 02:29.230 Now it's comparing the fifth character. 42 02:29.230 --> 02:31.840 Click on this and you can see the fifth character is 2. 43 02:31.870 --> 02:33.310 But we entered 5. 44 02:33.940 --> 02:36.580 So the fifth character is also 2. 45 02:37.840 --> 02:40.870 So now we know that we entered the wrong one. 46 02:40.870 --> 02:43.060 So it's going to jump. 47 02:44.470 --> 02:49.600 So he's going to jump here and then come up with the negative 1. 48 02:49.660 --> 02:50.170 All right. 49 02:50.170 --> 02:55.510 So now we restart again to fish the sixth character, run to main. 50 02:56.440 --> 03:00.340 Step over until you come to this line. 51 03:00.640 --> 03:10.810 And then step over this line, and then key in the first five characters that we have fished out, L-I-L-2- 52 03:10.840 --> 03:11.410 2. 53 03:12.400 --> 03:17.170 So now we enter L-I-L-2-2. 54 03:17.440 --> 03:21.190 But the sixth character, we don't know. Sixth character we don't know. 55 03:21.190 --> 03:22.930 So we just put 6, 7, 8, 9. 56 03:24.190 --> 03:30.100 We put 6, 7, 8, 9, hit Enter, and now we are back here. 57 03:30.100 --> 03:33.460 We step until we come to this call. 58 03:33.700 --> 03:34.990 Step into it. 59 03:35.800 --> 03:36.700 Click again. 60 03:37.210 --> 03:39.880 Right-click, graph this, and trace. 61 03:44.550 --> 03:45.060 Okay. 62 03:45.060 --> 03:49.830 First character, which is L. This L here, as you can see. 63 03:54.290 --> 03:56.240 Second character, which is I. 64 03:58.490 --> 04:00.350 And I here, as you can see. 65 04:04.550 --> 04:05.690 Third character. 66 04:05.690 --> 04:09.830 Click on this and you can see the character is L, which is this third character. 67 04:09.830 --> 04:12.830 L here. Continue to step over. 68 04:15.090 --> 04:17.670 Click on this. Fourth character is 2. 69 04:17.670 --> 04:19.860 Which is this character 2 here. 70 04:23.470 --> 04:24.970 Continue to step over. 71 04:27.020 --> 04:27.290 Go. 72 04:27.350 --> 04:28.040 Next loop. 73 04:31.020 --> 04:34.680 Now this is your fifth character, which is again 2. 74 04:34.770 --> 04:36.690 So which is this character here. 75 04:36.690 --> 04:37.170 2. 76 04:38.620 --> 04:40.510 So continue. 77 04:41.500 --> 04:45.010 Okay, so this is our sixth character, the target. 78 04:45.010 --> 04:47.020 We are now fishing this one. 79 04:47.320 --> 04:49.270 So click on this and see what is it. 80 04:49.390 --> 04:50.410 So it is 8. 81 04:50.410 --> 04:51.700 But we entered 6. 82 04:52.120 --> 04:52.990 We entered 6. 83 04:53.020 --> 04:54.130 See here, 6. 84 04:54.580 --> 05:01.180 So now we know that the sixth character is the character 8, so we have fished out 8. 85 05:03.100 --> 05:03.430 Okay. 86 05:03.430 --> 05:11.350 So because we didn't enter correctly, so it's going now it's going to jump down here and give a bad result 87 05:11.350 --> 05:13.060 for -, which is -1. 88 05:13.060 --> 05:18.340 So we can restart and run again to our loop, to our main function. 89 05:18.370 --> 05:27.010 Run until you reach this line, step over it, and then enter the first six characters we should have 90 05:27.010 --> 05:34.090 fished out, which is L-I-L-2-2-8, L-I-L-2-2-8. 91 05:34.660 --> 05:39.580 And because the seventh, eighth, and ninth, and the rest of the characters, we don't know. 92 05:39.580 --> 05:44.830 So we put 7, 8, 9 at the back here, 7, 8, 9, hit Enter. 93 05:45.760 --> 05:46.570 So we're back here. 94 05:46.570 --> 05:49.330 Now continue the step until this line. 95 05:49.330 --> 05:51.130 Step into this line. 96 05:51.130 --> 05:52.240 Step again. 97 05:53.080 --> 05:55.750 Right-click and then graph it. 98 05:55.750 --> 05:56.620 Trace. 99 05:57.700 --> 05:58.690 Step over. 100 06:01.290 --> 06:03.210 First character, L. 101 06:08.770 --> 06:10.510 Second character, I. 102 06:16.540 --> 06:18.430 Third character, L again. 103 06:23.640 --> 06:24.540 Fourth character. 104 06:24.540 --> 06:25.500 2. 105 06:26.220 --> 06:26.580 2. 106 06:26.610 --> 06:27.540 Is this one here. 107 06:27.630 --> 06:28.470 First 2. 108 06:34.560 --> 06:34.890 Okay. 109 06:34.890 --> 06:36.810 Loop goes back to the loop. 110 06:38.920 --> 06:42.910 And then here will be your fifth character. 111 06:44.260 --> 06:45.250 Which is 2. 112 06:50.120 --> 06:52.940 And then here will be your sixth character, which is 8. 113 06:53.450 --> 06:55.760 So this 8 over here is the sixth character. 114 06:56.300 --> 06:59.300 So the next one we are expecting is the seventh character. 115 06:59.300 --> 07:01.430 So let's go straight and see what happens. 116 07:03.890 --> 07:07.580 So this, click on this, will be the seventh character, which is 1. 117 07:07.580 --> 07:09.140 But we entered 7. 118 07:09.500 --> 07:11.150 We entered 7, as you can see here. 119 07:11.150 --> 07:17.360 7. So now we have fished out the next character, which is 1. Okay. 120 07:17.360 --> 07:20.690 So let's step over because we entered the wrong character. 121 07:20.690 --> 07:28.070 It's going to, is going to jump and add, return a negative 1 for -. 122 07:28.070 --> 07:32.240 So let's restart now and repeat again the same technique. 123 07:34.250 --> 07:44.330 Run until you come to this call and all this, and then enter your password that you've fished so far, which 124 07:44.330 --> 07:49.880 is L-I-L-2-2-8-1, 2-2-8-1. 125 07:50.300 --> 07:52.700 But the eighth and ninth we don't know. 126 07:53.000 --> 07:55.400 So we just put 8, 9 over here. 127 07:55.760 --> 08:01.850 Hit Enter, and then continue to step over until we come to this line. 128 08:01.850 --> 08:05.360 And then we step into this, click again. 129 08:05.360 --> 08:08.720 And then here we right-click and graph. 130 08:10.370 --> 08:11.330 Now we trace it. 131 08:13.770 --> 08:14.070 Okay. 132 08:14.070 --> 08:15.450 This is the first password. 133 08:15.480 --> 08:16.770 First character, L. 134 08:21.820 --> 08:23.110 Then followed by I. 135 08:27.800 --> 08:30.140 Click on this, followed by L again. 136 08:34.750 --> 08:37.600 Click on this, followed by 2. 137 08:41.640 --> 08:42.510 Next loop. 138 08:43.200 --> 08:44.340 Come up here. 139 08:46.320 --> 08:47.640 Followed by 2 again. 140 08:47.640 --> 08:48.930 So we are here now. 141 08:50.130 --> 08:50.940 2, 2. 142 08:50.970 --> 08:52.290 Next one should be 8. 143 08:52.740 --> 08:54.390 So let's go and see. 144 08:56.050 --> 08:56.920 Click on this. 145 08:56.920 --> 08:57.400 Yes. 146 08:57.400 --> 08:57.880 It's 8. 147 08:58.420 --> 09:00.100 Next one should be. 148 09:00.830 --> 09:01.730 1. 149 09:01.910 --> 09:04.700 So let's continue to go straight. 150 09:06.820 --> 09:07.690 Let's click on this. 151 09:07.690 --> 09:08.830 Yes, is 1. 152 09:08.830 --> 09:10.750 So now what's the next one. 153 09:11.230 --> 09:12.070 The eighth character. 154 09:12.070 --> 09:12.670 What is it. 155 09:12.670 --> 09:13.690 Let's continue. 156 09:16.250 --> 09:17.090 Click on this. 157 09:17.810 --> 09:21.980 The eighth character is 3, but we entered 8, so we entered 8. 158 09:22.010 --> 09:23.000 As you can see here. 159 09:23.360 --> 09:26.900 So the eighth character is supposed to be 3. 160 09:27.500 --> 09:28.520 So we fished it out. 161 09:29.150 --> 09:30.590 So let's continue. 162 09:31.310 --> 09:33.710 It goes here because we did not enter 3. 163 09:33.710 --> 09:34.490 It goes here. 164 09:35.120 --> 09:38.030 And it's going to return another bad value, which is negative 1. 165 09:38.030 --> 09:41.750 And let's restart and run to our main again. 166 09:42.170 --> 09:47.270 Continue to step over until we come to this call. 167 09:47.270 --> 09:48.500 Step over this call. 168 09:49.160 --> 09:57.170 And now we enter the eight characters that we have successfully fished out, which is L-I-L- 169 09:57.200 --> 10:04.370 2-2-8-1-3, L-I-L-2-2-8-1-3. 170 10:06.020 --> 10:12.740 But we don't know the ninth character and the tenth and the eleventh and the twelfth and the thirteenth and the 171 10:12.740 --> 10:13.460 fourteenth and the 172 10:13.730 --> 10:15.320 fifteenth. 173 10:15.320 --> 10:16.520 So the remainder ones. 174 10:16.520 --> 10:18.320 We just put 9. 175 10:18.320 --> 10:25.520 A, B, C. ABC is actually the hexadecimal for 10, 11, 12. 176 10:25.520 --> 10:29.990 So we just put 9, A, B, C, hit Enter, and now we are back here. 177 10:31.220 --> 10:34.340 Continue to step over until we come to this line. 178 10:34.340 --> 10:37.850 We step into this line, click again, right-click. 179 10:37.850 --> 10:40.430 And then here, graph it, trace it. 180 10:44.740 --> 10:45.910 First character. 181 10:45.910 --> 10:46.450 L. 182 10:49.970 --> 10:51.650 Second character, I. 183 10:56.020 --> 10:57.550 Third character, L again. 184 11:01.770 --> 11:03.360 Fourth character, 2. 185 11:06.460 --> 11:07.270 Loop on top. 186 11:11.280 --> 11:13.260 Click on this. Fifth character, 2. 187 11:13.290 --> 11:14.400 So we are now here. 188 11:14.400 --> 11:16.680 Fifth character, which is 2. 189 11:22.220 --> 11:24.110 This is the sixth character, which is 8. 190 11:24.110 --> 11:26.930 So we are here at the sixth character. 191 11:31.980 --> 11:32.640 Click on this. 192 11:32.640 --> 11:34.770 This is the seventh character, which is 1. 193 11:35.130 --> 11:36.660 This is your seventh character. 194 11:41.280 --> 11:41.970 Click on this. 195 11:41.970 --> 11:44.070 This is your eighth character, which is 3. 196 11:44.820 --> 11:48.270 And now we want the ninth character. 197 11:49.020 --> 11:51.600 So let's continue to step over. 198 11:53.820 --> 11:55.710 Go to the third loop. 199 11:56.610 --> 11:57.540 Come here. 200 11:57.810 --> 11:58.680 Step over. 201 11:58.830 --> 12:00.990 And this is your ninth character. 202 12:00.990 --> 12:03.210 Click on this and you can see it is 3. 203 12:03.690 --> 12:07.590 So it is another 3 here. Okay. 204 12:07.590 --> 12:12.720 So far we have got L-I-L-2-2-8-1-3-3. Okay. 205 12:12.720 --> 12:13.410 That's great. 206 12:13.410 --> 12:15.630 So let's continue to step over. 207 12:17.950 --> 12:24.070 And he's come over here, and he's going to return a bad value for -, which is negative 1. 208 12:24.820 --> 12:25.150 Okay. 209 12:25.150 --> 12:29.980 So if we solve this one, we will continue in the next lesson where we continue with the tenth character 210 12:29.980 --> 12:30.700 and so on. 211 12:30.730 --> 12:32.140 See you in the next lesson.