Arduino: The Complete 3 Books in 1 for Beginners, Intermediate and 19 Sample Designs and Codings and Advance Crash Guide in Arduino Programming by Webber Zach

Author:Webber, Zach [Webber, Zach]
Language: eng
Format: epub
Published: 2018-11-02T16:00:00+00:00

Stacks

Stacks are yet another extremely important computer science concept. They’re important primarily because they work in a really crucial and integral way with things like pointers and arrays. So, what are they?

This is a bit more in-depth than Arduino but nevertheless you will still inevitably run into the basic stack terminology in discussions on Arduino programming, so it’s important that you have a solid idea of what the stack is and how it can be used.

“Stack” is actually a relatively versatile term. The idea of a “stack” simply refers to what it sounds like - a stack of values. You can add variables to this stack. Imagine a block tower. You can add blocks on top of this tower with ease, but you can’t remove blocks from the middle of the tower without toppling every block above it. This is essentially how a stack works.

You can put things on top of the stack, and these things are also the first things to be removed from the stack. This is especially useful in algorithmic programming, but it does bear some use in Arduino programming as well. Why? Because when you’re dealing with complex and limited memory structures, you’re going to inevitably run into many occasions where the best path forward is to use a stack. This is because the stack is very memory-easy. It doesn’t demand anything aside from the location of the last thing in the stack and the current thing in the stack, and these things are easy to use.

It also gives you an incredibly easy way to refer back to data that you’ve already used, so that’s pretty nifty in and of itself. Stacks are, in essence, an extremely useful tool for any programmer, and there are some Arduino IDE functions that actually reference the concept of a stack and build on the concept.

The stack is built of two essential functions: pushing and popping. Both are extremely easy to understand, so we shouldn’t need to spend too much time going over what they actually are.

Pushing refers to adding something to the stack. It’s a pretty straightforward concept. You can push a value onto the stack in order to save it for later and instantly recall it without having to worry about things such as the name of the variable on top of the stack or its value.

Popping refers to taking something off of the stack. When you pop a value from a stack, you remove the thing that was most recently added to the stack and take its value. You can then use its value however you like. If you want to return the value to the stack, just remember that you’re going to have to push it on there again. When you pop something, it removes it from the stack altogether and makes it so that it no longer can be accessed by the stack. When you pop something from the stack and remove it, the second-to-last thing that was pushed is now the first thing to be popped.

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