Is it required to free a pointer variable before using realloc?

The specific usefulness of realloc is that you don't need to free before using it: it exists to grow memory that has already been allocated.

Neither one. You should always check for realloc returning NULL; if you don't, you'll be leaking memory if it does. Also, you're casting the return value of an allocator function, which is not advisable.

Also, you'd better use sizeof(*myArray) instead of the explicit sizeof(type) construct, because if you later change the type of your array/pointer, and you forget to change the type here also, you'll be facing hard-to-track-down segfault and/or memory leak errors. To sum up.

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