Stacks are useful data structures for a variety of reasons:
Stacks allow you to reverse the order of elements. By pushing elements onto a stack and then popping them off, you can effectively reverse the order of a sequence[1][2]. This is useful for problems that involve reversing strings, expressions, or arrays.
Stacks keep track of function calls and recursion. When a function is called, its parameters, local variables, and return address are stored on the call stack. This allows the function to return to the correct location after it finishes executing[4]. Stacks are also used to keep track of recursive function calls.
Stacks are used to evaluate expressions. Stacks are commonly used to evaluate postfix (reverse Polish) expressions. Operands are pushed onto the stack, and when an operator is encountered, the necessary operands are popped, the operation is performed, and the result is pushed back onto the stack[1][4].
Stacks are used in parsing. Stacks are used in parsers to keep track of the state of the parser as it p...
