## What is Stacks, Definitions, Types, Pros and Cons

###### Authored By: Deepali Mishra

A stack is a linear data structure that follows a particular order in which the operations are performed. The order may be Last In First Out (LIFO) or First In First Out (FIFO). Stacks are used to store data in a linear fashion and to perform various operations on the data stored in them.

Stacks are classified as a linear data structure, which means that the data is stored and accessed in a linear fashion. They are also classified as a dynamic data structure, which means that the size of the stack can change during the execution of the program.

One of the main advantages of stacks is that they are very efficient for certain types of operations. For example, the push and pop operations, which are used to add and remove elements from the stack, are both very fast. Stacks are also very simple to implement, which makes them easy to use and understand.

However, one of the main drawbacks of stacks is that they have a fixed size, which means that they can only hold a limited number of elements. This can make them less flexible than other data structures, such as arrays, which can be resized as needed.

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## Some key takeaways about stacks include:

• Stacks are a linear data structure used to store data in a linear fashion and perform various operations on the data
• They follow a particular order, either LIFO or FIFO, and are classified as a dynamic data structure
• Stacks are efficient for certain types of operations, but have a fixed size and may be less flexible than other data structures

## There are several real-time applications of stacks, including:

1. Expression evaluation and syntax parsing: Stacks can be used to evaluate arithmetic expressions and to parse the syntax of programming languages.
2. Undo and redo operations: Stacks can be used to implement undo and redo operations in software, such as text editors and image editors.
3. Function calls: In programming languages, stacks are often used to store the information needed for function calls, including the return address and the arguments passed to the function.

For example, consider a simple calculator that can evaluate arithmetic expressions. The calculator could use a stack to store the operands and operators as it processes the expression. When an operator is encountered, the calculator could pop the top two operands from the stack, perform the operation, and push the result back onto the stack. When the expression is fully processed, the final result would be the only element left on the stack.

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## Conclusion

In summary, stacks are a useful data structure for storing and manipulating data in a linear fashion. They are efficient for certain types of operations and are simple to implement, but they have a fixed size and may be less flexible than other data structures. Stacks have many real-time applications, including expression evaluation, syntax parsing, undo and redo operations, and function calls.

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