# Testing Boundary Values for the remove_current Function in the "sequence" Class

## What are the valid boundary values to test the remove_current function in the "sequence" class of Chapter 3, considering a zero-based index?

Options:

- Option 1: -1
- Option 2: 0
- Option 3: Length of the sequence - 1
- Option 4: Length of the sequence

## Answer:

In zero-based indexing, the valid boundary values to test the remove_current function would be Option 2: 0 and Option 3: Length of the sequence - 1. Options 1 and 4 are not valid as they would result in indexing errors.

When testing the remove_current function in the "sequence" class with zero-based indexing, it is important to consider the valid boundary values to prevent errors. Option 2: 0 is a suitable boundary value because it represents the first element in the sequence, given that indexing begins at zero.

Option 3: Length of the sequence - 1 is also a valid boundary value. This is because, in a sequence of 'n' elements with zero-based indexing, the last element is located at position 'n-1'. Testing the remove_current function with this boundary value helps ensure the correct functionality of the function.

On the other hand, Option 1: -1 is not a valid boundary value in the context of zero-based indexing. Negative indices are not used in this scenario and would lead to errors if tested. Option 4: Length of the sequence is also not appropriate as it refers to a position beyond the last element, resulting in an indexing error.

By focusing on testing with the appropriate boundary values, such as 0 and length of the sequence - 1, developers can verify the effectiveness and accuracy of the remove_current function in the "sequence" class.