Size of dynamic array in C doesn't change

Question

I was getting realloc(): invalid next size for a program. So I just coded this to understand what\'s happening.

#include 
#include &l         


        

Answer 1

sizeof(inp) in your case is sizeof(pointer) and hence sizeof(char-pointer) on your system is 8 bytes which is a constant. While allocating memory using malloc() you would have specified the size so why do you need to get the size of the allocated space again?

And I see res is being initialized and not inp