struct Basics | C Programming Tutorial

[@PortfolioCourses]

Also note in this video when we assign y to x, this would *also* be a memory leak, which is bad! 🙂 I was trying to stay focused on structs in this video, but this other video covers memory leaks which are important to avoid: kzbin.info/www/bejne/ooKmfXSBm8iMf5Y.

[@OCEAN-fc9wl]

This channel is awfully underrated. Respect.

[@PortfolioCourses]

Thank you so much for the kind feedback, I really appreciate that. :-)

[@SIGSEGV200]

frfr

[@daishakpatel224]

There can't be a better video on structs other than this one on youtube. Pretty much everything covered in one video.

[@PortfolioCourses]

Thank you for the positive feedback Daishak, I'm glad to hear you enjoyed the video! :-)

[@Peter_1986]

Structures confused the hell out of me when I started reading about them; this video made them much more clear.

[@togotog1330]

This channels quality content gonna be remembered for generations he teaches clear and concise thank you sir for your service to this populace

[@PortfolioCourses]

Thank you very much for sharing such positive feedback, that really motivates me to keep going with these videos! :-)

[@naparcasc]

Very clear explanation about how pointers contain a reference to some area in memory and not the content of that memory area itself and why you need to be extra careful when reasigning pointers. Thank you so much for your work!

[@hyperphenomenal4360]

this is the best c tutorial in entire youtube, i have been searching for months and now got the best content for c, thank you so much man

[@Russerdreng]

My teacher is totally useless. This channel is the only thing, keeping me from failing. Thank you so much, you have a knack for explaining hard material so a noob can understand it.

[@PortfolioCourses]

You’re very welcome, I’m really happy to hear you’re finding the channel helpful! :-)

[@Algebraiic]

Once again an EXCELLENT tutorial! You really make me love C, honestly.

[@PortfolioCourses]

Thank you very much for the positive feedback! :-) And I’m glad these videos are encouraging your own enthusiasm about C, I definitely love using it!

[@mah-b]

using this video to study for structs on my next exam and you made everything super clear holy crap

[@PortfolioCourses]

I’m glad the video made everything super clear, and good luck on your final exam! :-)

[@daved1113]

This is perfect. Thank you. Pretty much everything you need to know about structs all in one easy to understand video.

[@PortfolioCourses]

You’re welcome! Thanks for sharing that you enjoyed it, that’s excellent to hear! :-)

[@nephewtechnologies]

After you explained struct I was about to leave to find a video about typedef then you explained it. Great video!

[@PortfolioCourses]

I'm glad you liked it! :-)

[@undercoverz99]

its crazy how such high quality material is hidden on the internet. your videos should have millions of views!

[@PortfolioCourses]

I’m glad you enjoy them! :-)

[@lradhakrishnarao902]

You have explained the topic of shallow copy operation very well.

[@PortfolioCourses]

Thank you! :-)

[@yourfriend5144]

Omg thank you so much, this is so much better than two two hours lectures i had on structs... I have an exam next week and gonna watch the other videos on pointers and strings if you have any❤❤❤

[@naboulsikhalid7763]

wow, struct fully explained. Thank you for helping me and others to understand what you r self strive for.

[@PortfolioCourses]

You’re very welcome Naboulsi, I’m glad the video helped you out! :-)

[@dollyguarana7077]

I've learned so much about C these last two/ three months thanks to you :)! Muito obrigado pelos seus vídeos!!!

[@PortfolioCourses]

I’m so glad to hear these videos are helping you out, thank you for sharing this! :-)

[@pasej5]

This is by far the best video on struct, very good content.

[@PortfolioCourses]

I'm glad that you enjoyed it, and thank you for sharing this positive feedback! :-)

[@phytoplancton4038]

you are my favourite teachher so far thank youuu

[@PortfolioCourses]

Wow, thank you so much, you're welcome! :-)

[@nunomartins467]

I wanted to ask something about the data struct and when you declared x = y. That struct only has a pointer variable so when you did x = y you are assigning the pointer value of y to x right? That's why when modifying x.array[0] if you print both x.array[0] and y.array[0] they have the same value, so in that example as we assigned the x pointer variable to be the same as y we lost the pointer to the original array that x was pointing to right? It still exists in memory but we can't used it?

[@jcamargo2005]

Yes, the block is still on the heap, but we lost the pointer. It is one way to produce a memory leak

[@bhavik_1611]

The best explanation on struct ever!!

[@PortfolioCourses]

Thank you very much for the kind feedback, I’m glad you’re enjoyed it! :-)

[@adamaqil1965]

You helped me a lot understanding struct. Thanks!

[@PortfolioCourses]

You’re very welcome Adam! :-)

[@fadieid5638]

Very clear and concise, thank you for this quality content.

[@PortfolioCourses]

You’re welcome Fadi! I’m glad to hear you enjoyed the video. :-)

[@ramakrishna4092]

@@PortfolioCourses hi sir I am having a doubt why we used strcpy to assign string to structure members of " name and ID " Instead OF ASSIGNING directly like normal structure variable of age and grades . I have tried to assign string to structure members of "name and ID " when I compiled my code I got an error . why and what is the difference can you pls explain me ???😊

[@PortfolioCourses]

@@ramakrishna4092 We can initialize the string when we declare the struct using an initializer list as in this example: www.delftstack.com/howto/c/c-initialize-struct/. But if we first declare the struct, and then set the members with individual assignment statements, we cannot later use = to assign to the string. It's like how in C we can initialize an array once with the {1,2,3,4,...} type syntax, when it is declared, but not afterwards. When we make a char array we can initialize it once to a string literal when it is declared: char string[] = "store this string"; But if we had this it would not work: char string[20]; string = "store this string"; The same thing is happening here essentially, when we declare the struct the string is essentially declared and created similar to the above example. We cannot assign to it later with = "some string", we then need to use strcpy(). It's just how C works that it's like this really. 🙂

[@fifaham]

@4:00 Hi Kevin, I have watched this before and would love to learn how to copy this struct from an Excel Spread Sheet, and Paste it and Save it to Excel Spread Sheet. I appreciate if you have the time to do a video on that. This makes a very useful tool for embedded design. Thanks a million, Kevin.

[@PortfolioCourses]

Is the Excel filed saved as a CSV file? That may be do-able. If it's not some kind of binary .xls format I'm not sure how. :-)

[@fifaham]

CSV file would do it, yes.

[@mohamedhossam3645]

your channel is a gem

[@PortfolioCourses]

Thank you for the positive feedback Mohamed, I appreciate it! :-)

[@ItachiUchiha-jj9tm]

that thing i can only comment is it was so clear... thanks and good luck!!!!!

[@PortfolioCourses]

You’re welcome Itachi! I’m glad you found it clear. :-)

[@ilayohana3150]

Hopefully your courses will help me get an A in my technician year. Good work

[@MrBlaze777]

This is truely a detailed source Thank you bro!!

[@PortfolioCourses]

You're very welcome! :-)

[@birukgessessegudeta3629]

Thank you very much, please keep uploading videos. Much love!

[@PortfolioCourses]

You’re welcome, and I’ll definitely keep uploading videos! :-)

[@RustysAdventures]

Wow! This video really blew me away. Great video to learn struct

[@PortfolioCourses]

I'm glad that you enjoyed it! 😀

[@thomaskitaba]

hammer on a nail. Simple short to the point.

[@todualuka5713]

Thank you, You did very good explanation with exampels. You finally made me learn to use structs properly and to pass them correctly to different functions.

[@PortfolioCourses]

You're welcome! :-) I'm really glad to hear that this video helped you to learn how to use structs!

[@Jonathan-mu5nx]

best tutorials you can find!

[@PortfolioCourses]

Thank you very much for the positive feedback Jonathan! :-)

[@Jonathan-mu5nx]

@@PortfolioCourses always helping mate. thank you so much! i have an assignment now with an array of struct to represent items in a shop (name, price, amount). they asked us to make a program with different functions so the user can add a product and buy a product from that shop and so the array has to be synchronized between all functions. I don't know how to make it happen because we didn't learn pointers yet.

[@PortfolioCourses]

@@Jonathan-mu5nx I have some videos on pointers and structs you might like: Introduction To Pointers: kzbin.info/www/bejne/aHinmot9areZhKc Arrow Operator: kzbin.info/www/bejne/rWa7fmSEbM1_ncU Dynamically allocate an array of structs: kzbin.info/www/bejne/oqKbpX2JaMxpqrs Good luck! 🙂

[@ramisa_draws]

Thank you! this video made so many things clearer for me! Any chance you'll make SDL tutorials for C?

[@PortfolioCourses]

I don’t have plans to right now but maybe it’s something I can do one day. :-)

[@ramisa_draws]

@@PortfolioCourses yeyy, thank you!

[@fedibaklouti3239]

Can i know why you didn't use the typecasting with malloc in this case Or at least recommend a video to me to understand ,and thanks ❤️❤️

[@ابوأحمد-ث9ت4ض]

Best c tutorial ever

[@yunosukemiro8802]

Sir,can I know which compiler you use

[@blockcrafterxy6967]

Love your videos! Learned more in two weeks than 5 months of studying. I have one question tho: When calling the function (at around 9:10 in the video) I get the error: a parameter list without types is only allowed in a function definition; when I try to compile it. (the error for the function call in the main body)

[@PortfolioCourses]

The source code for the video is here, does using this help? github.com/portfoliocourses/c-example-code/blob/main/struct.c

[@aminebadri5118]

thank you for making it easy on us champ.

[@AnalogDude_]

19:55 x = y, wouldn't that be a memory leak? since you lost the original pointer (location) with the data still being there.

[@mdanishossain026]

thremendous tutorial in c fullplaylist is superb sir ❤❤❤💖💖💖💖💖💖

[@PortfolioCourses]

I’m really happy to hear that you’re enjoying the tutorial and playlist! :-D

[@chrislazarou2682]

which IDE do you use?

[@rohmaabdulfattah2582]

Thanks for this wonderful, clear and succint explanation

[@PortfolioCourses]

You're welcome Rahmat, I'm glad you enjoyed it! :-)

[@michaelbenard6758]

I have seen alot of your videos and are helpful, I have a little problem how would I get computer serial Number. system("wmic get bios serialnumber>sn.txt"); And store it in an array of character and then print it on screen.? I really need help with that.

[@Avionics1958]

Great video. I have a question. What's the difference between a struct and class? And when to use them. I know class is by default private but how to use these two terms properly.

[@zacherymcclendon3945]

I don’t think C has classes that’s C++ but I’m also confused on like why classes were a necessary change from C to C++ I’m pretty sure it has something to do with OOP but I’m not too sure

[@zacherymcclendon3945]

Just looked it up I guess classes have a deinitializer function that destroys instances of the class so I guess you can’t tell if the structs are getting destroyed

[@derekdannaldson1906]

el mejor video explicando structs, gracias por hacer este video!

[@PortfolioCourses]

de nada! :-)

[@luckydev3911]

quick question, what happens to the previous malloc'ed memory region of x after pointing it to y? does it just float in memory to be reclaimed by the OS later?

[@PortfolioCourses]

It's a memory leak. :-) Which means the memory has been allocated, but is no longer accessible by our program. It also won't be "returned" to the OS until the program terminates. So we call it a memory leak because the memory is no longer available for our program, but it's also not being used in a useful way either.

[@svenwaibel7007]

Great channel with great explanations, thank you! I just fiddled around with memory and leaks. I hope this is correct and may help someone. #include #include typedef struct { int *array; } Data; void print_array(const char *name, Data data) { printf("Array %s ", name); for (int i = 0; i < 2; i++) { printf("%i: %d ", i, data.array[i]); } printf(" "); } void separate_data() { Data x; x.array = (int *) malloc(sizeof(int) * 2); x.array[0] = 1; x.array[1] = 8; print_array("x", x); Data y; y.array = (int *) malloc(sizeof(int) * 2); y.array[0] = 9; y.array[1] = 9; print_array("y", y); free(x.array); free(y.array); } void same_data() { Data x; x.array = (int *) malloc(sizeof(int) * 2); x.array[0] = 1; x.array[1] = 8; print_array("x", x); Data y; y.array = (int *) malloc(sizeof(int) * 2); y.array[0] = 9; y.array[1] = 9; print_array("y", y); // deallocate memory of x because pointer x will be moved to y free(x.array); x = y; print_array("x=y", x); free(y.array); } int main() { separate_data(); same_data(); }

[@carlbroman1135]

Very well explained! I will hear ”points” in my sleep now tho ⚰️

[@jcamargo2005]

23:00 In case it was not mentioned, you also get a memory leak on the x.array block, and a duplicate reference to the y.array block... Common pitfalls to the begginers...

[@PortfolioCourses]

Yes, we need to watch out for these things. :-)

[@lradhakrishnarao902]

I have a question. In the assignment of structures, does the addresses of the structures also gets copied? E.g., When we do p1 = p2, does p1 also contains the address of p2?

[@PortfolioCourses]

Great question! :-) No, p1 and p2 each have their own address at which a struct is stored. And when we do p1 = p2, a memcpy() will effectively happen where p2's contents are copied to p1. But p1 and p2 each still are in different memory addresses.

[@jayjenous7601]

I'm learning C, i'm an amateur wannabe from python, can i take the structs as objects, and the variables declared from the structs as instances?, I feel them like that

[@PortfolioCourses]

Great question Jay! :-) And yes that’s correct, when we define a type of struct it’s a lot like defining a class in Python (in other words, a type of object). And when we declare variables of that struct type, those are a lot like object instances.

[@jayjenous7601]

@@PortfolioCourses thanks boss, i was kinda Lost on this till i related structs with classes

[@PortfolioCourses]

You’re welcome! :-)

[@lradhakrishnarao902]

difference between structs and class is that in structs, functions are private and data members are public, while in class, it's opposite. However, C does not have any concept of objects, as we don't instantiate. In C, structures are mainly used for the purpose of grouping various information under one name.

[@shashank12able]

​@@lradhakrishnarao902

[@nicholasjoiles8999]

very detailed. Thank you. 💯💯

[@PortfolioCourses]

You're very welcome Nicholas! :-D

[@anastasiosvervantidis2026]

Your introduction is very elaborate and comprehensive 😁. But Kevin 40 is quite old for a student, isn't he? 🤣

[@PortfolioCourses]

He’s a mature student. :-)

[@deep2mixer]

Excellent ..very good channel.

[@karolinariddle6359]

thank you, the best content I have seen about this topic. Great! :)

[@PortfolioCourses]

You’re welcome Karolina, and thank you for the positive feedback! :-)

[@Anonymous-XY]

Thank you, Amazing work.

[@PortfolioCourses]

You’re welcome, and I’m glad you enjoyed it! :-)

[@starstuff606]

thanks for the video, and great presentation

[@PortfolioCourses]

You're welcome, I'm glad you enjoyed it! :-)

[@ltcqqn]

very helpful! thank you so much

[@PortfolioCourses]

You’re welcome! :-)

[@amandaliu7409]

very helpful thank you

[@alexander-ud9bs]

thank you for this great job

[@dbak6924]

thank you! very good explaining😄

[@PortfolioCourses]

You're welcome, I'm glad you enjoyed the explanation! 🙂

[@nkurikiyimanaaimable9004]

awesome content always my go to

[@PortfolioCourses]

I'm so glad to hear you're enjoying the content! :-)

[@shanjosebastian8482]

Nice tutorial.... Very helpful

[@PortfolioCourses]

Thank you for the kind feedback Shanjo! :-)

[@dimphomokoena4982]

Please do pointers

[@didierleprince6106]

Merci a LOT 🙂

[@jmesguerra2664]

so structs is a class without functions?

[@PortfolioCourses]

In C, essentially yes. :-) In C++ struct is a lot more like class though, just so you know: learn.microsoft.com/en-us/cpp/cpp/classes-and-structs-cpp?view=msvc-170

[@stonedcodingtom9097]

Thx!

[@PortfolioCourses]

You’re welcome! :-)

[@skeeberk.h.4396]

This is heaven 😍

[@PortfolioCourses]

I'm glad you enjoyed the video! :-)

[@MrMits92]

do we need to free() the x and y array somehow, since we use malloc() ?

[@MrMits92]

i actually found a solution: we need to free x.array before we make x=y assign, then at the very end we free y.array. I was trying to free both x and y array at the very end but there was still a leak, so hope it might help someone check for leaks on Mac with: CK_FORK=no leaks --atExit -- ./a.out

[@MrMits92]

#include #include #include typedef struct { int *array; // pointer to dynamically allocated array } Data; int main() { // initialise two structures named x and y of type Data Data x; Data y; // stores 5 int in dynamically allocated array x.array = malloc(sizeof(int) * 5); y.array = malloc(sizeof(int) * 5); printf(" X's pointer: %p ", x.array); printf("Y's pointer: %p ", y.array); x.array[0] = 1; x.array[1] = 2; x.array[2] = 3; x.array[3] = 4; x.array[4] = 5; printf(" ////// x.array /////////// "); for(int i = 0; i < 5; i++) { printf("x.array[%d] = %d ", i, x.array[i]); } y.array[0] = 9; y.array[1] = 9; y.array[2] = 9; y.array[3] = 9; y.array[4] = 9; // 'x' with it's pointer to the array it has been set to point to the same array that 'y' is pointing to // so they point to the same array, // cuz the STRUCTURE STORES A POINTER TO THE ARRAY THAT WE DYNAMICALLY ALLOCATE free(x.array); // free up the allocation before we assign x = y; // here we see that they both now point to the same pointer for an array printf(" X's pointer: %p ", x.array); printf("Y's pointer: %p ", y.array); printf(" ////// x.array after assign to y /////////// "); for(int i = 0; i < 5; i++) { printf("x.array[%d] = %d ", i, x.array[i]); } printf(" "); // if we change one value of x array, those changes apply also to the y, cuz after x=y assign they both point to the same array x.array[0] = 10; printf(" ////// y.array after x.array[0] was changed /////////// "); for(int i = 0; i < 5; i++) { printf(" y.array[%d] = %d ", i, y.array[i]); } printf(" "); free(y.array); return 0; }

[@PortfolioCourses]

@@MrMits92 That is correct!

[@cscor]

Thanks!

[@PortfolioCourses]

Wow thank you so much for the 'super thanks'!!! :-D

[@mimicmian]

謝謝！

[@PortfolioCourses]

WOW thank you very much for the super thanks!!! :-D

[@didierleprince6106]

Génial !

[@PortfolioCourses]

Thanks! :-)

[@user-cd7xk9jv3k]

Amazing

[@PortfolioCourses]

I'm glad you liked it! :-)

[@muhammadmahmoud2054]

1:42 A forty years old student! I guess you never stop learning ;-)

[@PortfolioCourses]

Hahaha :-)

[@smoothoperatah]

correct me if i’m wrong but p1 = p2 doesn’t copy the struct. it only copies the memory address (pointer) to the strut. since p1 and p2 are only pointers. so in essence p1 is destroyed and all that remains is two pointers to the original p2. perhaps you explain this later i haven’t watched to the end yet.

[@danieldevito414]

I absolutely love these videos, but I think it's important to point out that when you use malloc, you have to free the space before reassigning the pointer, or a memory leak is created. And I only say this because the dementia patients in the Whitehouse just urged us all to stop using these languages for this reason.

[@PortfolioCourses]

You're right, I was trying to stay focused on structs in this video and keeping it to a reasonable time, I've made note of this and pinned a link to this other video on memory leaks now: kzbin.info/www/bejne/ooKmfXSBm8iMf5Y

[@Graham_Rule]

The popup tools in your editor are too distracting.

[@pedroalmeida8453]

Just fo us tf 😂

[@drissnafi3]

10:00

[@theyamo]

who spells char as car nice vid btw

[@AA-mf2up]

you dont have enough place in char name for osas

[@mdsalmanfarse8914]

You teach very good undoubtedly but if you could give separate examples of every items instead of massing everything in a single code, it would be better to understand for us.... You can copy and paste from the previous code that you needed for the next example but please give separate examples instead of giving a very long example.

[@Jeremyak]

tfw you're Kevin

[@ryanalnaser914]

whatever anything

[@ryanalnaser914]

whatever anything I do or did

[@ryanalnaser914]

whatever anything I know or knew or do or did and in 7:14 or more you did something you know what I mean

[@ryanalnaser914]

I am not sure when exactly and whatver anythign

[@ryanalnaser914]

Anything*

[@ryanalnaser914]

whatever anything I do or did or anything

[@danielpopa1320]

11:23

[@PortfolioCourses]

Do you have a question? 🙂

[@ashokvarma3054]

Thanks!

[@user-cd7xk9jv3k]

Amazing

[@PortfolioCourses]

I'm glad you liked it! :-)