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Xiaobian to share with you what is a stack in the computer network, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

Stack is a kind of data structure in which data items are arranged in order, and data items can only be inserted and deleted at one end [called top]. In single-chip microcomputer applications, stack is a special storage area, and its main function is to store data and addresses temporarily, which is usually used to protect breakpoints and sites.

A stack is a specific storage area or register with one end fixed and the other floating [1]. Heap the data stored in this storage area is a special data structure. All data storage or withdrawal can only be carried out at the floating end (called the top of the stack). The elements located in the middle of the data can only be removed from the upper part of the stack (those who enter the stack) one by one. An area in internal memory (random access memory) is opened up as a stack called a software stack; a stack made of registers is called a hardware stack.

In the application of single-chip microcomputer, the stack is a special storage area, and the stack is a part of the RAM space. The stack is used for function call, interrupt switching to save and recover field data. Objects in the stack have a feature: the first object on the stack is always taken out last, which is often referred to as FILO-First-In/Last-Out. Some operations are defined in the stack, the two most important of which are PUSH and POP. PUSH operation: the stack pointer (SP) is added by 1, and then an element is added to the top of the stack. On the contrary, the POP (out-of-stack) operation first feeds the contents of the internal ram unit indicated by SP into the directly addressed unit (destination location), and then subtracts the stack pointer (SP) by 1. These two operations implement the insertion and deletion of data items.

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