realloc Function

The realloc ( ) function gives you a means to change the size of a piece of memory space allocated by malloc ( ), calloc ( ) or by itself. While adjusting the size of the allocated block to new one, it may copy contents to the new location if necessary. Its declaration is of the form,

           

                        void *realloc ( void *block, size_t size );

Here block points to start of memory block obtained previously and size refers to the new size for the allocated block. It returns a void pointer to newly allocated block of memory. It returns a NULL pointer if it fails to reallocate piece of memory space.

realloc ( )  is equivalent to malloc ( )  if the first argument passed to realloc ( ) is NULL

float *ptr;

ptr = (float *) realloc ( NULL, 10*sizeof (float));

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