Difference between malloc and realloc?

Question

Suppose I\'ve two code samples for creating a integer array of 10 elements:

int *pi = (int*)0; 
realloc(pi,10);

and the other is the one that i

Answer 1

The first assignment is not legal, because the pointer you pass into realloc() must have previously been given to you through an allocation of some kind. (Furthermore, you're ignoring its return value, something you must never do with allocations!)

malloc() is to create a buffer for something, of some fixed size. realloc() is to give back one buffer and get another of some (presumably) different size -- and it might give you back the same buffer you were using.