Local vs global variables in C

[@tapiocaferoz02]

It's hard to believe that there is someone who teachs so well a subject that nobody even teach... Thanks for all your videos!

[@janaschelle8377]

Thank you, sir! There aren't so many channels about C on KZbin, I am super glad to discover yours! Greetings from Germany!

[@suchithboddu7242]

Really appreciate the way you teach with appropriate examples. I would suggest you to create a playlist for C programming with the proper order of videos.

[@CodeVault]

Thanks! All the playlists on the channel are based on topic and as close as possible to a proper order. The videos weren't made with an order in mind so I just ordered them from the easiest to hardest.

[@brandonmohammed9092]

Yo hope you're doing good bro. You've helped me with alot and I just noticed you haven't posted in 2 months so hope you're good mentally and you and you're family are safe

[@CodeVault]

Thanks man. We're all alright! I'm still active on the Discord server. More videos are coming soon!

[@taylorvaughan3257]

As someone new to C, this is such a fantastic video, and helped me understand something I'd been missing this whole time. People like you who take the time to help others with niche problems, are truly the heroes of the internet! Keep being great!

[@kkrolley]

Sir, keep on doing those! Great vid!

[@eliadamsalem5486]

good job! waiting for sockets tutorial!!

[@ellipszia]

an in depth great explanation! Thank you!

[@sa-ri5kl]

Hi, thank you for these amazing tutorials Please make a video about socket programming.

[@parrotparrot1948]

You earned yourself a subscriber :)

[@dylanwalter-gb7kq]

as a aspiring programmer, this video is one of the best i've seen

[@hugo-garcia]

I would like a video about how embed assembler instructions within C code

[@CodeVault]

Interesting topic, I noted it down!

[@brijmohansiyag9668]

The additional informations you give are very very helpful and motivates to learn more Thank you bro Love from India❤️

[@craigkinney853]

Hi I've been reading forums like stack overflow and geekforgeeks, cprogramming etc. They all mention compilers and the different types of them. People will say 'oh better to use gcc gmw for that' but what really are the differences. If you have the time would you include a layman's explication. Reading the forums can be difficult for beginners. Finally could you point me to one of your videos that explains size_t? I think I saw it somewhere in your videos with a good explication but can't find it again. Thanks in advance.

[@CodeVault]

I'll look into the different compilers, I think it's a great topic for a video! You can always search it on our website: code-vault.net Here's the video: code-vault.net/lesson/wkec83yooo:1603733527208

[@brightlyricsmusic]

Sir if it is possible can you provide practice questions on pthreads and Unix processes? Bcoz I am not able to find questions

[@matteopisati9966]

very very well Done ! Thank you

[@brightlyricsmusic]

Sir please start a java tutorial tooo your teaching is the best.......

[@CodeVault]

I will keep that in mind. I might upload some videos on Java

[@mastenaliouat7431]

keep going you are the best from kabylie

[@jellyfish1772]

Thank you so much

[@testvb6417]

i dont know man, you are the best

[@pawanthanay]

please make a video on generic functions like qsort() and bsearch() Thanks in advance

[@ZennyTheMama]

WHAT A CHAD!

[@ProMineWolderfull]

Hey my friend, do you have any videos about how to get rid of from fgets? I have been trying by using Mystring(strlen(Mystring)-1)= '\0', but when i get to the end of the file this method breaks the last character of the string For example: The last line that the fgets reads is the string MANAGER, then when i use the method above, it outputs MANAGE, Could you help me please? Thank you man, your videos are helping me a lot. :D :D

[@CodeVault]

Hmm, to solve this issue you have 2 options: 1) Check if eof was reached in the file (feof(inputFile)) and don't remove the last character in that case 2) The easiest solution would be to just add a after the last line inside the input file. That's what I usually do to make all the lines be exactly the same.

[@lucasferrini7063]

Well, kinda late, but you could check if the current char is and the next one is \0 using a for. If that condition checks, replace the current char with \0

[@brightlyricsmusic]

Sir please upload video about sleep() in pthreads where to place it I am having doubts in that actually in my college I am having os going on and I completed pthreads,process from your channel it would be really helpful for me if you upload video about sleep(), wait() in pthreads and process plzzz

[@CodeVault]

It's not that tricky. sleep you call when you want your thread/process to stop its execution for some time. And wait() you call when you want to stop a processes execution until another child process finishes its execution. So they are very different functions

[@wassimboussebha2561]

Hi can you do a playlist about trees and implementation using C

[@CodeVault]

It's on my todo list. I will get to it whenever I have time

[@189Blake]

Sorry for the dumb question, but what are those arguments inside your main function?

[@CodeVault]

In this video I explain them: code-vault.net/lesson/dbijqbwu2a:1603733526118

[@BelallGamall]

Really Great ❤

[@lenausa6462]

I dont know man,yor are the best

[@talroz8431]

thanks!!! best tutorial!!

[@Кукусик-е2э]

🔥Global variables eat more memory, but make code processing easier. 🍀Local variables save memory, but make more memory garbage and decrease processing efficiency.

[@CodeVault]

It's not quite like that. Your first point is mostly correct but they both use the same amount of memory (if they are the same type of course), it's just that local variables can be deallocated in the middle of running the process, thus freeing up some memory for the process to use. Local variables sometimes can decrease efficiency, although it is such a small decrease it's not worth thinking about. It usually just involves increasing or decreasing the stack pointer value which is super quick, only the compiler might do a bit more work to figure out how much memory it needs to allocate for the stack of a specific function call (but this doesn't affect runtime performance).

[@Кукусик-е2э]

@@CodeVault thanks for your answer! This memory/efficiency thing became very interesting to me since I started coding games which includes Game Loop usage. So, if there is a piece of code in the loop with some method that has a local variable initialization line, plus some extra methods that assign same values to that variable (like getting length or dimention etc.)... well, what happens is that loops iterate hundreds of thousand or even more times per second, all those local variable keep on getting created and destructed hundred of thousand times per second... But if I just get one global variable outside the loop and assign it value just once. Well, I guess I need to write some code to test it all 😄

[@CodeVault]

The local variable's memory is allocated and deallocated only once (even if it is a loop). Of course, the assignment will be done multiple times if it's in a loop. I have to check if for objects in C++ the same applies for constructing and destructing the data. I assume those get called each iteration of the loop

[@parsishashank]

Yes, c programming will follow static scoping.

[@pranithrshetty437]

Can you make a video on dining philosophers problem?

[@CodeVault]

I noted it down

[@GoblinGreen911]

unrelated:i don't understand what the termios.h library does,make a video please explain.

[@CodeVault]

I'll look into it!

[@doragonmeido]

i was going to comment last seen 8 months ago but then i saw you replayed to a month old comment . i found hope

[@CodeVault]

Yes, I am still replying to comments

[@doragonmeido]

@@CodeVault thank you

[@ibukiyoshida4125]

Will you do a calloc tutorial?

[@CodeVault]

I briefly talk about calloc in this video: code-vault.net/lesson/akvjz24gn5:1603733521718

[@mrafayshams3089]

I have heard multiple times that global variables are bad practice. I’m more of a embedded C programmer. Why is it the case? Or are global variables, especially those within a same file are okay?

[@CodeVault]

In most Object Oriented languages, you can argue that global variables are bad practice but, in C, it's sometimes a necessity. The main problem with global variables is they can be modified from wherever in your code and it could cause unexpected issues. A lot of the time is better to return a new value (struct or primitive) from a function you're calling so that, instead of working with a global variable, you use the returned value instead (and that value can't changed outside of the scope of that function, unless you explicitly let it to)

[@krish5226]

Why you're not making videos🥺🥺

[@CodeVault]

I will get back to it soon! Be on the lookout!

[@monusolanki5263]

How to create c language graphics program in visual studio code

[@CodeVault]

It's quite complex. You could either use the native APIs for GUIs (like Win32) or a library with cross platform compatibility like GTK+

[@monusolanki5263]

@@CodeVault thanks so much sir lots of love ❤️ from India. Also I have one question ..can we add audio file in c program..& how

[@monusolanki5263]

@@CodeVault plz upload one graphics program video..I have installed GUI library files but I don't know how to linked library files with visual studio code

[@CodeVault]

I'll look into it

[@CoderDBF]

I gave a dislike because you don't address globals when working with multiple files.

[@CodeVault]

There's a video for that: code-vault.net/lesson/fjri9hcdte:1642359047479