Question

my question is will garbage collector will free a memory if the variable allocated is malloced again without freeing the memory.

eg:

ptr1 = malloc(100)
ptr1 = malloc(200)

In this case will the first allocated memory will be deallocated by garbage collector??
If yes then when..???

Answer 1

No, it will result in a memory leak.

There is no garbage collector in C.
You have to do the memory management yourself.

ptr1 = malloc(100);
free(ptr1);
ptr1 = malloc(200);
...
...
free(ptr1);