What defines an infinite loop?

• A. A loop that runs for a pre-set number of iterations
• B. A loop that executes indefinitely without terminating
• C. A loop that runs only until a certain condition is met
• D. A loop that runs once and stops

Answer: (B)

An infinite loop is characterized by its ability to execute indefinitely without a terminating condition. This occurs when the loop's exit criteria are never met or are absent altogether, causing the loop to continue running endlessly. In many programming scenarios, this can happen due to a flaw in the logic or a mistake in the condition that controls the loop.

For example, consider a loop that is designed to repeat until a variable reaches a certain value, but if there is no mechanism in place to change that variable during the loop's execution, the loop will never terminate. This behavior is often highlighted when debugging, as it can lead to program crashes or unresponsive applications.

In contrast, the other choices refer to loops with defined behaviors: a pre-set number of iterations, a condition that allows for terminating, or a single execution followed by termination, all of which do not align with the essence of an infinite loop. The key distinction lies in the lack of an endpoint, which is the hallmark of an infinite loop.