Difference between arrays and pointers in C

int[] and int*... what is the difference actually? That's what we're trying to clarify in this video.

[Miguel-mvyc]

How can you have so little views, this content is the best I have found so far!

[imperatusmauser]

Hands down the best programming YouTube channel. I learnt a lot more than the Indian dudes that can't explain what an unsigned integer is.

[noweare]

I think of an array as a constant pointer, you can not assign a different address to arr, but you can use it to loop through the array i.e. * (arr+3) say to access its members. A pointer is more versatile as you can assign different addresses to it to point to different arrays and you can index through an array by using *(p++). int a[] ={1, 2, 3}, b[3] and trying to assign b=a I get caught with that sometimes. have to use memcpy to do that : )

[sonyiq]

thank you for this series of c programming, very helpful and very easy explained with correct type of examples.. realy thx man

[bestieboots]

Your content is gold. And your voice is pleasant to listen to while learning.

[talalquleh]

great explanation👏🔥, thanks for the video

[diskoboi]

Thanks, this cleared up a lot of confusion i had :)

[iamqaasim]

Thanks for this!! it was really insightful.. keep it up!

[pitankar]

This is wonderful. Thanks for making these. I was also looking for tutorials on linker script, you know of any good resources on that?

[navidnouri]

Thank you so much. That was one of my open question..

[edward]

So when you use malloc and after that your int *p will be equal with the address of the first 4 bytes( first int variable) aka p[0] so it's actually the same case like of an usually array? What I mean the whole block of memory you allocated it will have as his address, the address of p[0] ?

[missrudy]

you explain things to clearly. thank you !

[StealOfApproval]

What about when you need to dynamically allocate memory to a size not a constant (3 in your example). For instance, user inputs int sizeOfArray, but
Int * arrp = malloc(sizeOfArray * (sizeof(int)) doesn't compile

[itsmespiazzy]

Question, what's the difference between passing ([][]) as a parameter instead of (**) for matrixes, for example.
int foo(a[]);
int foo(*a);
with one I need to use as a good practice?
do i need to always write foo ([]) if the passing parameter is a static allocated array?

[pawsdev]

Why while intialization of a char array pointer memory allocated automaticly, but with int arrays we must allocate it manually

[Immerz]

Thank you. I wondered why *array++ is invalid code. It kinda makes sense now why.

[ed.peguillan.]

This is a fantastic video, thank you for exploring this topic!


I was just wondering if you might consider making a video in the future as a sort of addendum which covers this same concept, but also with the subtleties that come with strings? There are so many ways to declare strings in C. For example:


char* readOnlyMemoryString = "spaghetti";
char arrayDeclarationOnly[];

char* dynamicString = malloc...;
char sugarString[] = "test123";


I got bitten by the first line at work recently because I did not realize that strings declared that way are placed in an area of memory that is neither in the stack nor the heap! I am finding string parsing to be very difficult. If you have already made a video on this topic, please disregard my comment! I am still making my way through your videos.

[wrosen]

why does char *name = "Bob" work but
char **names = {"Bob", "Bill", "Steve"} doesn't?

[edward]

Why is p[0]=1 ? it shouldn't be *p[0]=1 since
you are assigning a value and not an address?!

[pawsdev]

So there is no difference at all, they differ only with math of navigation, in loop with pointer you use pointer increment p + n, and if you use square bracket you just increment number in square brackets [i+n], i saw only this. The a both limited in stage of init, array[] limited with number in [], pointer array is limited with malloc, so no difference if you use [3] or malloc size int*3 in final.
Yes, you can save memory in initialization, but who cares this in our days