Dynamic 2d array allocation and deallocation in C

Excellent explanation

perfect video

why did u stop posting ? 😥

Dude is a GOAT. As a grad student taking a CS class (non cs major) this has made it extremely clear how to allocate dynamic memory. Thanks!

Very informative 🔥

I know I'm a bit late to the party but goddammit that explanation is so good. pleace don't stop doings vids like this you've made a difference in someone's life

this is the one

Nice explanation! However there's an optimized way to allocate a 2d array

int **p = (int **)malloc(rows * sizeof(int *));
p[0] = (int )malloc(rows columns * sizeof(int));
for (i = 1; i < rows; i++) {
p[i] = p[i – 1] + columns;
}
free(p[0]);
free(p);

In this case, a single block of memory is allocated and rearrange the pointers to form an array. This is computationally better for a few reasons:
1. The allocation engine does not perform as many allocations as before.
2. As opposed to the conventional implementation, there's no extra bytes between rows to keep count of the memory blocks. That means the final 2d array is represented in a continuous memory block. Therefore, there's no need to make large moves between those positions in the memory.
3. free() is called twice only. The conventional implementation depends on the 'rows' size.

This is a life saver. Thank you!

exactly what I needed :) I'm working on a small project that solves a system of user input equations and this is the core of it

Wow ! Great explanation, i'm french and your english is very understandable ! Thanks a lot !

Amazing explanation way more clear than my college professors

This has been the most easy -to-understand tutorial ever since. Thanks a lot.
Just a little something : on function free2dIntArray() we shouldn't include the third parameter dim2 on the function's prototype.

Thank you, this was an approachable explanation that helped me finally understand the concepts.

Very good explanation sir it's a superb video. Everyone can understand this concept without any doubt.

please you are amazing , thnks a lot and you have made my difficulties become simple for me 💯🙏🙏

thank you for the effort creating this wonderful video

B E A U T I F U L EXPLANATION

best explanation , keep it going !

why is (int**) debatable? is there something wrong with using it? thanks!

make more videos please

thanks a lot that was quite helpful.

I feel like I don't need to know this for the problem set I'm doing, but this was very helpful regardless. Thank you!

legend

Can you please make complete knowledge of c/cpp, You are way of teaching so good and you really get us into deep which really i want !!

Thanks for this video 🤠

this video is so good!Thanks!

you're a fuckin lifesaver, man

i love this

It would have been nicer if you give meaningful names to parameters like instead of Dim1 Dim2 you can could have written Row and col, in video you are mentioning them as row and col why not name them the same.

thank you sir!

I went in with no expectation, I finished with complete understanding of what I should be doing, and also a slightly better idea on pointers/array. Thanks a bunch, appreciate your work greatly.

This was gem

Clearly understood! Thank you sir.🙇

Best video on this topic !! Thanks alot.

Thank you very much for this wonderful content.

thank you sir.

Actually the true dynamic 2d array can be allocated with a pointer to array. Just do `int (*arr)[dim2] = calloc(dim1, sizeof *arr);`. And that's all. Just remember to call `free(arr)` at the end.

Strictly speaking isn't this a lookup table not a true contiguously allocated 2d array?

You're the best

Can you please make a video about dynamic allocation for array of strings please

I finally understood why it works like that thanks to you :)
Just got a question, in the freeing part (the correct one) wouldn't it be the same if I didn't pass dim2 as a parameter, since it's not needed for deallocating the memory?

amazing explanation!! Thanks alot really

Finally some good explanation about 2D dynami array! Piece of gem! Thank you!

thanks bro!

Very well explained , I'm glad I found your channel !

Just like professor Feynman said if you understand something well enough you’ll be able to explain it in the most simplest way.and that’s exactly you’ve done. Thank you for making this difficult topic understandable!!!

great video