The correct answer is to add a counter variable that increments and check it in the condition. An infinite loop occurs when the loop’s termination condition is never met, causing the program to run indefinitely and freeze the application. By introducing a counter that increases with each iteration and including it in the condition, you create a guaranteed exit point—once the counter reaches a specified limit, the loop stops, effectively fixing the infinite loop. On the CompTIA ITF+ FC0-U61 exam, this concept tests your understanding of loop control and debugging logic, often appearing in scenario-based questions about unresponsive applications. A common trap is thinking that simply adding a break statement will suffice, but without a counter, the break may never be reached. Remember the memory tip: “Count to exit”—a counter ensures the loop has a finite number of steps, preventing the endless cycle.
FC0-U61 Software Development Concepts Practice Question
This FC0-U61 practice question tests your understanding of software development concepts. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A web application is not responding to user input. The developer checks the code and finds an infinite loop. Which change will fix the infinite loop?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a counter variable that increments and check it in the condition
Option C is correct because an infinite loop occurs when the loop's termination condition is never met. By adding a counter variable that increments with each iteration and checking it in the condition, the loop will eventually exit when the counter reaches a specified limit, thus breaking the infinite loop.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Remove the loop body
Why it's wrong here
Removing the body does not change the loop condition; it will still loop forever.
✗
Add a break statement
Why it's wrong here
A break can exit the loop, but if placed incorrectly, it may not be executed.
✓
Add a counter variable that increments and check it in the condition
Why this is correct
A counter limits the number of iterations, ensuring the loop eventually ends.
Related concept
Read the scenario before looking for a memorised answer.
✗
Change from a for loop to a while loop
Why it's wrong here
Both loop types can be infinite; changing type does not fix the infinite condition.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think changing the loop type (e.g., for to while) or removing the body will fix the infinite loop, but the core issue is the lack of a proper termination condition, which only a counter or similar mechanism can resolve.
Detailed technical explanation
How to think about this question
Infinite loops typically arise when the loop's control variable is not updated within the loop body, or the condition is always true. Adding a counter variable that increments and is checked in the condition ensures that the loop executes a finite number of times, which is a common pattern in iterative algorithms. In real-world scenarios, such as processing user input in a web application, an infinite loop can cause the application to hang or crash, making proper loop termination critical for responsiveness.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Software Development Concepts — This question tests Software Development Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a counter variable that increments and check it in the condition — Option C is correct because an infinite loop occurs when the loop's termination condition is never met. By adding a counter variable that increments with each iteration and checking it in the condition, the loop will eventually exit when the counter reaches a specified limit, thus breaking the infinite loop.
What should I do if I get this FC0-U61 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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