All language subtitles for 013 Debugging Nested Loops_en

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Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,420 --> 00:00:02,480 Normally, the loops are very easy to control. 2 00:00:02,550 --> 00:00:08,460 You simply need to trace the counter eye during each run, but nested loops rely on two counters I. 3 00:00:09,420 --> 00:00:12,180 And so it can be hard to follow two counters at the same time. 4 00:00:12,190 --> 00:00:15,300 So it helps to visualize the runtime using breakpoints. 5 00:00:17,860 --> 00:00:20,710 In this lesson, you're going to learn to debug loops using breakpoints. 6 00:00:23,130 --> 00:00:26,670 All right, first thing to do is apply breakpoints to the nested loop. 7 00:00:29,540 --> 00:00:34,130 And so during the runtime, we're going to visualize and keep track of the counters I enjoy as the updates 8 00:00:34,610 --> 00:00:36,230 to launch a new debugging session. 9 00:00:40,400 --> 00:00:46,520 And as expected, everyone from the outer loop runs the inner loop 10 times, we can see that by looking 10 00:00:46,520 --> 00:00:52,070 at the counters and this is going to keep happening till the outer loop breaks so we can go ahead and 11 00:00:52,070 --> 00:00:53,180 stop the debugger. 12 00:00:54,480 --> 00:00:59,490 All right, now, you were given the task of printing a half pyramid using Java, the pyramid just 10 13 00:00:59,490 --> 00:01:04,650 rows, the first row starts with one star and the number of stars keeps increasing by one. 14 00:01:08,830 --> 00:01:10,270 But if you run the current code. 15 00:01:19,320 --> 00:01:24,840 This should be our output once again, the code you open doesn't behave like we want it to. 16 00:01:24,930 --> 00:01:29,310 Something is wrong and using breakpoints, we can visualize the runtime and fix it step by step. 17 00:01:30,000 --> 00:01:33,960 So I'm going to add one more breakpoint right here, then launch a new debugging session. 18 00:01:40,670 --> 00:01:44,270 It seems that each pass from the outer loop runs the inner loop 10 times. 19 00:01:47,950 --> 00:01:51,550 Every pass that follows princi row of 10 stars on the same line. 20 00:01:52,430 --> 00:01:57,280 If you look back at the output, the most obvious step is to add a new line after every arrow. 21 00:02:01,450 --> 00:02:05,500 So we can add a new line after the inner loop runs to completion right over here. 22 00:02:11,390 --> 00:02:12,560 Stop the debugger. 23 00:02:14,110 --> 00:02:14,980 We run the code. 24 00:02:22,800 --> 00:02:26,160 And this pyramid should have 10 rows, so this is progress. 25 00:02:27,810 --> 00:02:32,010 But how do we make sure that each row has as many stars as the order that it appears in? 26 00:02:34,230 --> 00:02:37,620 It might help to launch another debugging session and visualize the runtime. 27 00:02:46,280 --> 00:02:51,470 And I hope you can see the problem each passed from the outer loop, runs the inner loop 10 times. 28 00:02:52,460 --> 00:02:57,770 Instead, the first pass should run the inner loop once, the second pass should run the inner loop 29 00:02:57,770 --> 00:02:58,370 twice. 30 00:02:58,670 --> 00:03:04,360 And so the amount of times the inner loop runs should depend on the index of the outer loop. 31 00:03:04,970 --> 00:03:08,960 So the inner loop should keep running as long as J is smaller than I. 32 00:03:23,390 --> 00:03:24,920 OK, this is great progress. 33 00:03:26,510 --> 00:03:31,020 But why are there only one, two, three, four, nine lines? 34 00:03:31,490 --> 00:03:33,680 Wow, another bug that we have to fix. 35 00:03:34,870 --> 00:03:37,060 So we can launch another debugging session. 36 00:03:39,300 --> 00:03:45,240 And by visualizing the runtime, the issue becomes clear, the first pass from the outer loop doesn't 37 00:03:45,240 --> 00:03:48,960 do anything, so only nine lines from the pyramid shows up. 38 00:03:49,500 --> 00:03:52,650 That's because one eye is zero and zero. 39 00:03:52,960 --> 00:03:54,320 This condition is false. 40 00:03:54,360 --> 00:03:57,990 So we need to make sure that Jay is less than or equal to I. 41 00:04:17,130 --> 00:04:22,860 And perfect and displays ten rows each row has as many stars as the order that it appears in. 42 00:04:28,580 --> 00:04:30,500 The first loop runs only once. 43 00:04:35,300 --> 00:04:37,400 The second inner loop runs twice. 44 00:04:39,240 --> 00:04:41,160 A third inner loop runs three times. 45 00:04:44,990 --> 00:04:50,480 And pretty much the number of times the inner loop runs depends on the index of the outer loop. 46 00:04:58,530 --> 00:05:03,120 And honestly, it's really satisfying seeing the code, working with your own eyes. 4778

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