Stacks

Stack is a data structure which have system called LIFO(Last in First out).
We can imagine like there are over and over dirty plates and if
we want to clean this plates we must start with last dirty plates
and this plate came last to this structure.I implement a integer stack





Stacks have three main functions;

pop :// delete item which is on top
push : // create new item and place to top
top : // which element is on top