Stack top意思

"Stack top" is a term used in computer science and programming, specifically in the context of a stack data structure or a call stack. The stack top refers to the topmost element or the last element added to the stack.

In a stack, elements are added and removed from the same end, which is called the top of the stack. The stack top is the most recently added element and is also referred to as the "current" or "active" element. When a new element is pushed onto the stack, it becomes the new top element, and when an element is popped off the stack, the top element is removed, and the next element becomes the new top of the stack.

The stack top is often denoted by the symbol 'top' or 'tos' (top of stack), and it is a key concept in the operation of a stack, where the principle of Last In First Out (LIFO) is applied.