Stack? What is stack in data structure? An abstract data type is a mathematical model for data types. An abstract data type is defined by its behaviour from the point of view of a user, of the data, specifically in terms of possible values, possible operations on data of this type, and the behaviour of these operations. A stack is an abstract data type that holds an ordered, linear sequence of items, commonly used in most programming languages. A stack (sometimes called a “push-down stack”) is an ordered collection of items where the addition of new items and the removal of existing items always takes place at the same end. This end is commonly referred to as the “top.” The end opposite the top is known as the “base. “Stacks are used to implementing functions, parsers, expression evaluation, and backtracking algorithms. The stack can be used to convert some infix expression into its postfix equivalent, or prefix equivalent. These postfix or prefix notations are used in computers to express some expressions. The order in which elements come off a stack gives rise to its alternative name, LIFO (last in, first out).

Gokul Pradeep

119 resources

0

0

0

Like