The condition (top == -1) is used to check which of the following situation?a.Overflowb.Underflowc.isFull()d.None of the above

Break Down the Problem

1. We need to determine what the condition top == -1 signifies in the context of stack operations.
2. We will analyze the given options to find the correct one.

Relevant Concepts

1. In stack data structures, top typically refers to the index of the topmost element.
2. top == -1 usually indicates that the stack is empty since there are no elements present in it.

Analysis and Detail

1. Option a (Overflow): Overflow occurs when trying to add an element to a fully filled stack. This scenario is checked with a condition like top == maxSize - 1.

2. Option b (Underflow): Underflow happens when attempting to remove an element from an empty stack. This is typically indicated by the condition top == -1.

3. Option c (isFull()): The condition top == -1 is not indicative of a full stack but rather an empty one.

4. Option d (None of the above): Since one of the previous options accurately describes the situation, this option is not applicable.

Verify and Summarize

The condition top == -1 specifically checks if the stack is empty, which is related to the concept of stack underflow.

Final Answer

b. Underflow