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class StackUnderflowError < RuntimeError
end
class StackOverflowError < RuntimeError
end
class Stack
def initialize
@items = []
end
def push object
raise StackOverflowError if @items.length == 10
@items.push object
end
def pop
raise StackUnderflowError if @items.empty?
@items.delete @items.last
end
def peek
raise StackUnderflowError if @items.empty?
@items.last
end
def empty?
@items.empty?
end
def full?
@items.length == 10
end
end
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