Which best describes when a for loop is typically used?

• A. When the number of iterations is known in advance
• B. When the number of iterations depends on a condition
• C. When you want to iterate until a file ends
• D. When you want to repeatedly execute code while a condition is true

Answer: (A)

Repeating a block of code a fixed number of times is best accomplished with a for loop. The idea is you know in advance exactly how many iterations you want, so you set up a counter that starts at the beginning, checks against a predetermined limit, and updates each pass. This makes the loop predictable and compact, with initialization, the termination condition, and the increment all tied to that known total. If the number of iterations depends on a condition discovered during execution, a for loop isn’t the natural fit—the while loop is designed for continuing as long as a condition holds. Reading a file until its end is another case that uses a condition-driven loop, not a fixed-count for loop. So when you know the exact count in advance, the structure that expresses that finite, known repetition is the best match.