Question

The following postfix expression
2 6 + 3 5 - /
evaluates to

Group of answer choices

-1

1

-4

4

this is not a postfix expression

In an array implementation of the StackInterface where push() and pop() are O(1), the top of the stack is

Group of answer choices

the first entry in the array

the last occupied entry in the array

the second entry in the array

the entry before the last ocuppied entry in the array

the first or the last occupied entry in the array

In ArrayStack implementation of StackInterface, what value of topIndex indicates that the stack is empty?

Group of answer choices

-1

0

1

null

None of the above

When you remove an item from a stack, you remove it from

Group of answer choices

top

bottom

the middle

wherever the client specifies

none of the above

Answer 1