Pointer in C

Question

Hi everyone. I really need some help on understanding pointer.
I’ve been encountering this same question over and over in the C challenges and I really don’t get it. Can anybody please help and explain how it works?😥

Here’s the question.
==========================

What is the output of the following code?
int *p = (int *)malloc(sizeof(int)*4);
*p = 42;
*(p + 2) = 43;
int* v = p;
*(v + 1) = 44;
printf(“%d”, p[1]);
printf(“%d”, v[0]);

Answer 1

// memory allocation to pointer variable p
int *p = (int*)malloc(sizeof(int)*4);

// set value of address pointer p as 42. it same with p[0]=4
*p = 42;

// same as above but its about p+2 (p[2])
*(p + 2) = 43;

// copy p's address to v. now they points same address.
int* v = p;

// set value of address pointer v+1 as 44. it same with p[1]=44 and v[1]=44
*(v + 1) = 44;

//output section
printf(“%d”, p[1]);
printf(“%d”, v[0]);

Hope this helps

Answer 2

Mystika L Ohhh now I’m getting it! Thank you so much!!👍

Answer 3

Jay Matthews thanks Jay 🙂 but like I mentioned I really want to know how the code works out! Especially the 4th line:
int* v = p;
what happens here?