Pointers, Stacks and Memory Addressing Computer Science and Programming Concepts.

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Presentation transcript:

Pointers, Stacks and Memory Addressing Computer Science and Programming Concepts

Lesson Objectives  Know what a pointer is  Know what they are used for  Explain the purpose of using pointers in computing and computer memory

Operators *= value of cell & = address of cell

The Matrix and Memory Addressing

Links  Claymation animation on pointers – Binky! Claymation  level_Computing/AQA/Problem_Solving,_Programming,_ Operating_Systems,_Databases_and_Networking/Progra mming_Concepts/Pointers level_Computing/AQA/Problem_Solving,_Programming,_ Operating_Systems,_Databases_and_Networking/Progra mming_Concepts/Pointers 

Memory Addressing “A digital computer's memory, more specifically main memory, consists of many memory locations, each having a physical address, a code, which the CPU (or other device) can use to access it” Ref:

Stacks A real life example is a stack of books you might have on your desk:

LIFO AND FILO  A stack is a last-in-first-out (LIFO) or first-in-last-out (FILO) ADT.  Implementations should include two operations, pushing and popping, and a pointer to the top of the stack.

Pushing and Popping in a Stack Let's take a look at a computer implementation of a stack:  Pushing: Adds a new specified item to the top of the stack  Popping: Removes the item from the top of the stack level_Computing/AQA/Problem_Solving,_Progra mming,_Operating_Systems,_Databases_and_N etworking/Programming_Concepts/Stacks

Wikibooks file path  Wikibooks Wikibooks  A-level Computing ‎ | A-level Computing  AQA ‎ | AQA  Problem Solving, Programming, Operating Systems, Databases and Networking ‎ | Problem Solving, Programming, Operating Systems, Databases and Networking  Programming Concepts Programming Concepts  Stacks Stacks