free ( ) Function

Memory is a limited resource. One should allocate exactly the sized piece of memory before you need it, and release it as soon as you don’t need it.

the free ( ) function release the memory space allocated previously by a previous call to the malloc ( ), calloc ( ) or realloc ( ). Its declaration is of the form,

                        void free ( void *block );

The realloc ( ) function can behave the same as free ( ) function provided the second argument passed to realloc ( ) is 0. So, in order to free memory allocated to a pointer ptr, we write

                        free ( ptr );

                        which is equivalent to

                        realloc ( ptr, 0);

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