Why do we type cast malloc into int*? the instructor

Question

C / C++

skalpasi

Why do we type cast malloc into int*? the instructor

said malloc returns a void* pointer. can someone explain the difference. how can a memory location be void type?

0

28.05.2022

8 ответов

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skalpasi Автор вопроса

Prince Of Persia [field = CE,DM = BLOCK]
void* isn't a pointer of void variables Because vo...

but i don't understand why we cast pointers to the data type of the variable it is pointing to. for ex- char msg[10] = "hello"; char *ptr = &msg; why do we use char data type for pointer when *ptr will always store an integral memory address. memory address are in hex/int format right? i might sound annoying but I'm studying this pointer concept for first time and is very confusing :(

0

28.05.2022

The prodigal ᥀

What's a void type according to you?

0

28.05.2022

skalpasi Автор вопроса

The prodigal ᥀
What's a void type according to you?

in functions, it's a type which doesn't return anything but i don't think there is something called void data type

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28.05.2022

The prodigal ᥀

skalpasi
in functions, it's a type which doesn't return an...

Ok then, void* is a special thing then.. isn't it?

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28.05.2022

Manav | avoid unnecessary messaging me

skalpasi
but i don't understand why we cast pointers to the...

there's mostly two reasons: 1. to maintain some form of type safety 2. alignment info for the type so you can do simple pointer arithmetic.

0

28.05.2022

Manav | avoid unnecessary messaging me

skalpasi
but i don't understand why we cast pointers to the...

it's fine. Your questions aren't annoying, it's just whoever taugh you pointers probably didn't do a good job at it when

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28.05.2022

John

skalpasi
but i don't understand why we cast pointers to the...

As i remember, array is Pointer. You dont have to take its addr (&).

0

29.05.2022

Prince Of Persia [field = CE,DM = BLOCK] · Accepted Answer

Prince Of Persia [field = CE,DM = BLOCK]

void* isn't a pointer of void variables Because void variable does not exist (you cannot have an variable of void - "void name;") void* is a pointer to anything It could be int or int[] or char[] or int[][] or anything So for using that variable which void* is pointing to, you have to cast void* to something else

0

28.05.2022

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