![]() ![]() Subroutines had already been implemented in Konrad Zuse's Z4 in 1945. Turing used the terms "bury" and "unbury" as a means of calling and returning from subroutines. Stacks entered the computer science literature in 1946, when Alan M. ![]() If the stack is full and does not contain enough space to accept another element, the stack is in a state of stack overflow.Ī stack is needed to implement depth-first search. A stack may be implemented to have a bounded capacity. This data structure makes it possible to implement a stack as a singly linked list and as a pointer to the top element. Ĭonsidered as a linear data structure, or more abstractly a sequential collection, the push and pop operations occur only at one end of the structure, referred to as the top of the stack. As with a stack of physical objects, this structure makes it easy to take an item off the top of the stack, but accessing a datum deeper in the stack may require taking off multiple other items first. The order in which an element added to or removed from a stack is described as last in, first out, referred to by the acronym LIFO. Calling this structure a stack is by analogy to a set of physical items stacked one atop another, such as a stack of plates. Pop, which removes the most recently added element that was not yet removed.Īdditionally, a peek operation can, without modifying the stack, return the value of the last element added. ![]() Push, which adds an element to the collection, and.In computer science, a stack is an abstract data type that serves as a collection of elements, with two main operations: Simple representation of a stack runtime with push and pop operations. Similar to a stack of plates, adding or removing is only possible at the top. For other uses, see Stack (disambiguation). ![]()
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