To offer a highly simplified explanation, when you compile your program back to machine code, the computer translates these functions into routines (and subroutines although these terms are somewhat interchangeable). When we program our Arduino, we often have functions. And it comes down to the basics of how computers work. It’s all well and good to have a data structure like this, but why? There’s a good reason why every uses a stack data structure at runtime execution. Conversely, when removing data from the stack it is popped. Even though we don’t use this terminology in abstract programming languages like C/C++, the assembly instructions and the actual machine code instructions for the CPU use this terminology. This the correct terminology for placing data onto the stack. Notice that we used the terminology pushed. Most computer architectures has the stack starting at the end of RAM, stacking data backward from there. Now to cover the inaccuracies of the analogy – It’s upside own. The first block of data sits on the ground, in the example below – an int, followed by a char pointer then a struct. Thinking of the stack like a tower of data is useful. Then once you’ve covered the basics, we’ll explain the nuances after to correct any inaccuracies. But we’re going to teach it to you because it makes it easy to understand. Let’s get one thing out of the way first, this analogy will be partially incorrect. The stack is a data structure, and you can visualize this a bit like a tower. Before we show you some code demonstrating stack and heap memory, let’s explain the stack and heap. Because Arduino is based on C/C++, you can store variables on the stack and on the heap the same syntactic way. 1: It is a linear data structure, which implies that elements are kept in a linear order, one after the other.: Because it is a hierarchical data structure, the components are stored in the form of a tree.: 2: Stack data structure works on LIFO (Last in First Out) property.: Heap data structure follows min-heap or max-heap property. In it data can be stored and removed in any order. It is an area of memory where chunks are allocated to store certain kinds of data objects. In it data can be added to and deleted only from the top of it. It is a LIFO (Last In First Out) data structure. If you’re here, you’re probably looking for some clarification between these two types of memories. What is Stack & Heap It is an array of memory.
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