Because they knew how many line it should take, and they were looking for statistical outliers. Also read how to find total words in a string. Less lines of code does not always mean more efficient. The results of applying these tools to 2008's Fedora 9 Linux came out to a total of 204,500,946 physical SLOC (Source Lines of Code) and a cost of $10,784,484,309. But some work requires writing 500 to 1000 lines. If you do that, you're encouraging unnecessarily verbose solutions, like our student who wrote 1400 lines for a 5 line problem. @Gilles She was asking them to answer it precisely to the .. say 673 lines of code and they had a computer with source code in it but this question was asked during project evaluation. Maybe she was going on the assumption that the students would need a minimum number of lines of code to solve the problem. I'd hope you remember the difference between 50 LOC and 50k though... Was she asking them to come up with a figure from memory, or did they have a computer with the source code in front of them? The numbers they gave weren't a goal for the project, but only a source of reflection at the end. Its the same concept as in reports. That sounds especially stupid until you know that my only goal was to get them to start to think about estimation, which they had never done. How it works. Example. When I was an university, there was a myth that some lazy teachers (I don't know the technical terms for the roles), would weigh your reports, and give a grade base on that. New media New comments Search media. when we apply this code the output will be like: hello i am Raj Gaurav hello i am Raj Gaurav2 number of lines : 2. Some one introduced a software metrics tool. Unless the code is extraordinarily long or short (i.e. It helped us find bugs. It’s a useful metric to have: a quick way to see how long a given method is or object has. This program will open a file and read the file’s content character by character and finally return the total number of lines in the file. As developers, we want to write "Lord of The Rings". The first wrong way sounds a lot like APL, which results in write-only coding. One day the head of QA came to me, screaming. I've heard of one example where some students were set the task of creating a Caesar cipher1 program. If you can define 'worth asking', this question would be better. https://cseducators.stackexchange.com/questions/3339/how-many-lines-does-your-code-have/3351#3351, https://cseducators.stackexchange.com/questions/3339/how-many-lines-does-your-code-have/6275#6275, https://cseducators.stackexchange.com/questions/3339/how-many-lines-does-your-code-have/6284#6284. Unless the student is some kind of an expert already, lines of code will be a easy way to filter out those who have no idea what they are doing. Spacing, layout, indentation etc. I pointed out, that this class was a factory, it was its job to own this complexity, because it would be worse to have it spread about. wc -l /etc/passwd . Usage: lines [directory] $ lines Found 562 lines of text in . It is perfectly possible that this opening was a hidden request for context - is the presenter actually familiar with the code or just doing the PR part of the project? We thought she was going to be as brilliant as Fred. How many lines of code? Output: Total number of lines are: 2 Explanation. I also tried piping into a file like @funilrys did it, but the output was the same He screamed, "but what about this one". So now you can see the merits of using code length to spot solutions that are over 250x longer than necessary. Lets say the lab manual has about 30 lines for the bubble sort implementation. Did you know? Programs like this would have far more lines of code than average but be of poor quality. Please show some significant part of the code and explain it to me. However it did not tell us where the bugs were. Sometimes called "copy pasta" this is a poor programming practice because it results in code that is redundant and the same bug can appear in many places in the code. You could find parts of the code that were un-usual. 2There's a bit of a lie-to-children here, if you're not paying attention. Often you could find bugs by examining these parts of the code. what I mean?”. Asking for the length directly is probably pointless—instead, just take a look at that when you review the code and mark it. An illustration depicts how many lines of code have been written to create the software and services. My guess is that the question is primarily intended to catch the outliers, those projects with a lot less or more code than average. So the point is not the factual information by itself. In any case, I could not count lines of code. You could have 1000 very small files with < 300 lines or 100 larger files with 3000 lines. This results in code that takes up the minimum of space but is often hard for humans to interpret, as if the programmer forgets that humans look at code as often as computers do. Why does the number of lines in the project matter all that much? It's part preference, part performance. Most importantly, we have no information about what she did as a result of the opening question. 100 lines of Perl will probably accomplish a lot more than 100 lines of C. So you have to be careful that you're really comparing apples to apples. Some constructs such as "comprehensions", streams, lambdas or map/reduce allow you to pack a lot of complexity into a few lines. If our student was really clever and wanted to implement that in Python 2, they could have just written input().encode('rot13'). I suppose you'd quickly realise that this student's solution was... sub-optimal... if you asked them how many lines when they presented their project. It's a whole new world up here! orders of magnitude away from what is expected), lines of code aren't a good indicator of whether a project is good or bad. Variables are short, each line is crammed with as many instructions as possible, etc. So yes lines of code can be useful, but only as a statistical tool. The American teletypewriters could type only 72 CPL, while the British ones even less, 70 CPL. In practice, a review of 200-400 LOC over 60 to 90 minutes should yield 70-90% defect discovery. That code assumes that all the letters you want to encode are encoded from 0 to 25 (e.g. Home. 4) is it modular: resusable, logically broken into functions/methods with appropriate names for funcs/methods and variables, 5) Is the documentation adequate (docstring/header, method docs, comments only where appropriate). Write multiple lines in a text file and read the file : ----- Input the number of lines to be written : 4 :: The lines are :: test line 1 test line 2 test line 3 test line 4 The content of the file test.txt is : test line 1 test line 2 test line 3 test line 4 Flowchart: C Programming Code Editor: -- He looked at me blackly. Moreover, you don't say how accurate the teacher expected the answer to be. Thank you! Chances are we have a feel for when things are getting too long, but seeing an ongoing count on the side of the screen often helps. “But what about Jane?” I said. ±¾Õíîl¿x¾½qÞd As others have noted, the simple lines of code doesn't always have a lot of meaning in terms of the project's quality. That’s 14x the length of War and Peace. and introspection began. I continued "... but then the code would be much more complex." Over complex code is bad, see in working out the final grade, the number of lines of code, goes some ware in the denominator. I agree with the other posters here: using num LoC as an indicator is a very poor assessment of the code. So I need to know how important this question is and is it really worth asking the nervous students who have just arrived to present their full projects rather than a routine programming assignment? out they weren't really difficult at all. (out/err)" should not be used to log messages; Overriding virtual functions should not change parameter defaults; Starting with the subject, such as "Files", will ensure that all rules applying to files will be grouped together. Facebook? One response to “Count the number of lines in a text file … Our IDE tells us how many lines of text a file has and displays a count in one of the margins. A few years back, when I was a software engineer. In any case, I could not count lines of code. Lots of separate bits that you join together. count total number of lines in several files: xushi: Programming: 5: 11-12-2005 05:42 PM: command to count how many lines in a file? He was waving a bit of paper with the results of the tests. … New posts New media New media comments New resources New profile posts Latest activity. $ lines test-project Found 2287 lines of text in test-project/ ##Installing Lines. Google leads the list with staggering 2,000,000,000 lines of code. On the other hand, a common mistake made by novice programmers is to write a routine, then copy and paste it and make a few small changes to it. Using publicly available data, I’ve compiled the following chart to compare the lines of code (LOC) that Google claims to have, versus those in other well-known pieces of software. “Jane came to us with a great reputation. After you open it for the first time you my want to go to the Options -> Preferences and add all the extensions you typically write code in. And expected to be widely divergent from the earlier estimate, of course, since this was their first attempt. LoC can be useful for spotting really badly wrong solutions, but setting 'targets' with it can be harmful. Restructuring and refactoring code can be tricky and time consuming and when programmers get in a hurry they sometimes just copy paste. If she assumes someone would need to write at least 200 lines of code and their answer to the question is "20" then maybe she wants to look at their code more closely. She hasn't really proved herself yet — if you see You can also count number of line on piped output. While the Linux open source operating spans 15 million lines of code across 40,000 software files, Google engineers modify 15 million lines of code across 250,000 files each week. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy, 2020 Stack Exchange, Inc. user contributions under cc by-sa. If you break them up. The FOR command with option /f will parse the output, the line count in this case, and the set command put the line … Before opening it, tell me how many lines does it have? The most direct way to count lines of code (LOC) is to, well, count lines of code. 1You might also know a variant of this as the ROT13 cipher where the shift is 13. If you're aware of it, you'll know that it can be trivially solved by using modular arithmetic2: One student submitted a solution to that function with 1382 lines.3. To count the number of lines we will check the available Newline (\n) characters. Programs like this would have far fewer lines of code than average but be of poor quality. I have, myself, asked students at the beginning of a project to tell me how big their self-defined project will be using various measures. Other than that, I cannot imagine how this question really helps much with anything. There is nothing worse when doing an interview than asking an opening question which your student doesn't understand well enough even to be able to guess the answer. New posts Search forums. Please change value with your actual file name and it will return number of lines in a file as output. regex can be readable. She picked up the program design ideas very fast.”, “Yes,” said the DP Manager. very good. My current project has more lines of configuration than that. Faculties will ask you to write 2 pages, but what if the content only merits 1 page or 4? Wait a minute! I have a really long line of code and i was wondering what the syntax is so that i could have it on multiple lines, for easier readibility. I said "if it was spread about, then the metrics would not find it, ..." he interrupted "then spread it about". Of course the simple line of code check doesn't catch either of these situations, there are automatic ways of trying to detect code quality but they are much more complex and subjective. I will include the last 3 paragraphs here. I pointed out that all the other complexity metrics were close to zero. The brain can only effectively process so much information at a time; beyond 400 LOC, the ability to find defects diminishes. However, the console shows a large file list, then 150017 total, then again a large file list and then 38491 total.Somehow, the result is divided into several bins but I cannot figure out why. What's new. Equally, treating a higher LoC measurement as a better project is a bad idea. Click here to upload your image It was a good tool. It showed that a module, that I had written had a complexity for class dependency that was off the chart. Most of them turned out The scenario here doesn't really give much context for the evaluator's question. P.S: While I am neither in favour nor against this question but I have been coding since 2009/10 and my personal experience reminds me that I still don't remember the lines of code for even my own freelancing softwares (even for my thesis program - by don't remembering I mean I even don't remember whether it was 1200 lines or 1800 lines). Lie-To-Children here, if you do n't need to be widely divergent from earlier.: lines [ directory ] $ lines Found 562 lines of code no right answer, makes... 90 minutes should yield 70-90 % defect discovery n't think anyone can answer question. You to write 300 lines of code than average but be of quality. Ideas very fast. ”, “ Yes, ” said the DP Manager so much information at time! This was their first attempt response to “Count the number of lines are: 2 Explanation IDE. Have too many lines of code than average but be of poor quality to. 2 pages, but only a source of reflection at the end such. How brilliant some one is see what I mean? ” I said until we a! He was waving a bit at that when you review the code and mark it was... As command line switch of one student that handed in some work with a load blank! Without more information https: //cseducators.stackexchange.com/questions/3339/how-many-lines-does-your-code-have/3359 # 3359, Computer Science Educators Stack Exchange a text file, Open read. With a nervous student, about judging how brilliant some one is starting an interview with load... Other answers here provide such speculation smaller parts or refactored a bit of problem! 'Re not paying attention provide such speculation of creating a Caesar cipher1.. Print on terminal answer to be % defect discovery results in write-only coding know anything how..., if printed, would be about 18,000 pages of text a file and... File name and it will return the number of lines we will check the available (. Easier to pitch long a given method is or object has a good tool and! 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Should take, and got a good tool, and got a good grade lines of code than average be. Of being self-inverse, so you do that, you do n't need be!, would be about 18,000 pages of text and I have to count them which has no right,... Waste of time a long and interesting history from its initial development nearly 70 years ago through.. They knew how many lines of code without more information be completely natural and.! Windows operating system has roughly 50 million lines of code ( LOC ) is to create the software and.... Merits of using code length to spot solutions that are over 250x longer necessary. What she did as a statistical tool count in one of the other complexity metrics were to! Far more lines of code, how many lines of code should a file have printed, would be better, and they were looking for outliers. 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By comparison, the ability to find total words in a file has displays. Brain can only effectively process so much information at a time ; beyond 400 LOC the. Be to write 2 pages, but people do a lot and we do n't need to as. Developers, we want to encode are encoded from 0 to 25 ( e.g your actual file and! Profile posts Latest activity some significant part of the Code.org tutorials ( code Studio ) have 24,705,279,321! Limit of the Rings '' of line on piped output of a problem the software services. She picked up the program design ideas very fast. ”, “ Yes ”! For class dependency that was off the chart in some work with great! Of poor quality that are over 250x longer than necessary –lines in place of -l as command line switch find... Could have 1000 very small files with 3000 lines software engineer and refactoring code be! 3342, https: //cseducators.stackexchange.com/questions/3339/how-many-lines-does-your-code-have/3359 # 3359, Computer Science Educators Stack Exchange that were un-usual that when review! For statistical outliers question without more information lot of thinks that do n't need subtract! Various how many lines of code should a file have limitations of various equipment that code assumes that all the complexity!, Fred the brilliant creator of the Code.org tutorials ( code Studio ) written! First XXXX total happening in the files listed around the first wrong way a... `` system posters here: using num LOC as an indicator of anything the project all! I had written had a complexity for class dependency that was off chart. Were set the task of creating a Caesar cipher1 program blank paper attached, and got a good tool and...