How malloc() , calloc() , realloc() functions work

Question

Could anyone explain me breafly how malloc(), calloc () & realloc() functions work with example plz.

Answer 1

malloc():- Allocate the memory block of requested size and returns a pointer to the first byte of block.
Prototype:- void *malloc(int);
The return type of malloc() is void while input is integer number which is the required number of bytes of a block.
We have to type cast it because its return type is a pointer to void.

For example:-
Int *p;
p=(int*)malloc(sizeof(int)); /* p points to the block allocated by malloc */
*p=20; */ store value 20 in block allocated*/

calloc():- Allocates the multiple memory blocks each of same size and also initialises all bytes to zero.
Prototype:-
void *calloc(int n, int size);

realloc():- Modifies the number of bytes required allocated memory block.
It is used to change the size of memory block allocated previously using malloc() or calloc() function.
Prototype:-
void *realloc(void *ptr, int size);

Answer 2

Yamin Mansuri could u suggest me any resources for C from where u learn these concept

Answer 3

👑Sam👑 youtube

Answer 4

https://www-geeksforgeeks-org.cdn.ampproject.org/v/s/www.geeksforgeeks.org/dynamic-memory-allocation-in-c-using-malloc-calloc-free-and-realloc/amp/?amp_js_v=a2&amp_gsa=1&usqp=mq331AQCCAE%3D#referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s&ampshare=https%3A%2F%2Fwww.geeksforgeeks.org%2Fdynamic-memory-allocation-in-c-using-malloc-calloc-free-and-realloc%2F

Answer 5

هاي