c - about malloc calloc and realloc -

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possible duplicates:
how malloc() implemented internally?
how free , malloc work in c?

whenever write program using malloc , calloc , realloc varies go , sit, i.e in part of memory go , reside. whether variables (in cases) allotted contiguous space or variables go , sit wherever space available

the requested memory allocated contiguously on heap if enough space available. otherwise, functions return null indicate failure.


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