StackManipulation

About the stack

The stack is the workhorse of the calculator, one of the key features is that it is multilevel. On the HP 48/49 and HP 49g+ the stack is numbered and of practically infinite depth (limited only by the addressable memory of the calculator.) The stack on these models is numbered as the levels deepen, ie the higher the number the deeper you are into the stack. The 1st level of the stack is appropriately named 1: and the levels are named incrementally ... 1: 2: 3:

You work on numbers by entering them onto the stack, one of the primary operators on the stack is the enter key. What is entered onto the stack is refered to as an Object. Objects are entered onto the stack and are operated on by the rules of Reverse Polish Notation