Lesson 5.14 · Answer it
Stack in words
6 marksYou mark it yourself against the marking points
A teacher collects exam papers in a pile on the desk. Each paper handed in goes on top of the pile, and the teacher always marks the paper on top of the pile next. All the papers are handed in before the teacher starts marking. The pile is a stack.
(a) Explain what last in, first out means for the order in which the papers are marked. [2]
(b) Name the four operations of a stack, and state what each one does. [4]
[6]