how to fix stack overflow at line 597

The stack register contains the address of the last item pushed on the stack. The stack is a region of memory used for temporary storage of instruction addresses and register values in a Last-In-First-Out (nested) structure. It is used for interrupts and subroutine calls.

NO STACK IS NOT DESCRIBE AS A POINTER BC PTR HOLD ADDRS OF DATA TYPE (INT O R VAR ) BU T STACK NOT HOLD THE ADDRS O FDATA TYPE

http://www.osix.net/modules/article/?id=275

muzzy writes "Here's some code for you kids. It demonstrates the concept of stack, implemented with a linked list mechanism to support virtually infinitely large stack sizes. Happy reading."

/* Simple Dynamically Allocating Stack Implementation in C
*
* Copyright (C) 2002 Muzzy of Worst Coders
*/

Stack is also dynamic memory, without the hassle. Dynamic memory uses pointers to check its value, free the memory, etc.