C Realloc ()

Hi..

Iam refreshing c language using this useful resource C Language

DMA Iam not able to understand the concept of realloc()..help me

This post looks more like a link posting than actually asking a question. Anyhow here is info on realloc:

Reallocates the given area of memory. It must be previously allocated by malloc(), calloc() or realloc() and not yet freed with a call to free or realloc. Otherwise, the results are undefined.

Reference: http://en.cppreference.com/w/c/memory/realloc