Understanding Pointers and Memory in C and C++

Pointers and dynamic memory allocation are some of the most confusing topics for new programmers! But don't be afraid of them--they're very useful concepts because they unlock the ability for your program to continually request and use new memory. In reality, a pointer is just a way to refer to the PLACE that a variable is stored, which lets you ask for more places to store variables.  Imagine a video game with unending levels--each level needs new memory. Pointers let you ask the system for new memory for each new level.

(Basic) Introduction to Pointers (C version) - What are pointers? Why do we care?

(Intermediate) - Memory Allocation Basics and, How to Allocate a Multidimensional array - Once you know the basics of what a pointer is, the next step is to use pointers to store arbitrary amounts of memory

(Intermediate)  - Understanding how Memory is really Laid Out - If you're having trouble getting your head around what memory really looks like--this article is the answer

(Intermediate)  - Debugging Common Problems with Memory Allocation - Pointers are great, but they do make it easy for your program to crash--learn how to fix it

 

(Advanced)  - Using auto_ptr to avoid memory leaks - Once you start allocating memory, you need to be able to free it, preferably automatically. Learn how in this article.

(Advanced, Linux)  - Using Valgrind to Find Memory Leaks - Learn how to track down memory leaks automatically using a free Linux-based tool

Pointers really are fun!

 

Alex

49 Dover St. #37, Somerville, MA 02144, USA