How to properly deal with dynamically allocated memory

I'm sure you know about malloc. In this video we'll take a look at functions that are so so useful but are not usually talked about and few people know about them.

[@lucasferrini7063]

I would like to add something that happened to me while using realloc. It's wise to use a temp variable to store the address that realloc returns, because it can happen that due to memory fragmentation you don't have enough space to expand your array, which results in realloc returning NULL. You wouldn't only be unable to store anything, but you would actually also loose the memory address of your array and produce a memory leak, as the original memory segment is still reserved, just not pointed to by anything.

[@CodeVault]

Oh, that's a good point, thanks!

[@mavrix2356]

Thanks for the Clean and clear explanation..

[@davidliverman4742]

Thanks for your time. God bless!

[@matteopisati9966]

thank you very much !

[@anaalcazar6533]

Hey there ! plz I need ur help. When we define a binary search tree with a root that contains INFINITY value does it mean that the right subtree is nonexistent ?

[@CodeVault]

I guess? Why would you ever do that to a binary tree though? You usually want to balance those trees so they are efficient

[@weeb2006]

in the other video, malloc() was type casted with (int*) but why it wasn't necessary in 1:18?

[@CodeVault]

In C it's optional to type cast the result of malloc. I may be inconsistent in some videos at times

[@chenwu9788]

do you have videos talking about vector and matrix computations?

[@CodeVault]

No. There is a library I used in the past called kazmath: github.com/Kazade/kazmath

[@chenwu9788]

@@CodeVault many thanks, do you know if the lib can do complex matrix /vector calculations

[@CodeVault]

I guess it's limited to matrices and vectors of maximum size 4. Since this is more of a computer graphics library. For actual math applications there is this: www.gnu.org/software/gsl/ It probably has whatever you need in there, you have to read the documentation a bit since it can be quite complex to use

[@chenwu9788]

how to do arr substract p using for loop, and without using for loop?

[@CodeVault]

With just a for loop: for (int i = 0; i < 64; i++) arr[i] -= p; I don't know how you'd do it without a for loop

[@chenwu9788]

@@CodeVault does c have array/matrix lib for matrix calculation?

[@CodeVault]

In its own standard library? No