These operations are called on a Stack : push(8), push(1), push(6), push(7), pop(), pop(), pop(), push(2), pop(). What is the data at the top position?A7B6C8D2
Question
These operations are called on a Stack :
push(8), push(1), push(6), push(7), pop(), pop(), pop(), push(2), pop().
What is the data at the top position?
A) 7
B) 6
C) 8
D) 2
Solution
The operations on a Stack are performed in the following order:
- push(8): The stack now contains 8 at the top.
- push(1): The stack now contains 1 at the top, with 8 below it.
- push(6): The stack now contains 6 at the top, with 1 and 8 below it.
- push(7): The stack now contains 7 at the top, with 6, 1, and 8 below it.
- pop(): Removes the top element, 7. The stack now contains 6 at the top, with 1 and 8 below it.
- pop(): Removes the top element, 6. The stack now contains 1 at the top, with 8 below it.
- pop(): Removes the top element, 1. The stack now contains 8 at the top.
- push(2): The stack now contains 2 at the top, with 8 below it.
- pop(): Removes the top element, 2. The stack now contains 8 at the top.
So, the data at the top position is 8. The answer is C8.
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