MCQModerate1 mark
1
Choose the correct answers to the questions from the given options. (Do not copy the questions, write only the correct answers.)
Select the infinite loop:
Topic: Loops and infinite loops
Previous-year question practice database
Try it
Pick an option and check your answer. The full worked answer is below either way.
Answer
Exam answer
(b) for(int i=2; i!=0; i-=3).
Explanation
Test each condition against the update. In (b) i starts at 2 and drops by 3 each time: 2, -1, -4, -7 ... it steps straight past 0 and the test i != 0 is never satisfied, so the loop never ends. In (a) i reaches 11 and stops; in (c) i becomes 6 and stops after one pass; in (d) i falls to 0 and stops. The lesson: != is a dangerous test when the counter changes by more than 1.
In words
for(int i=2; i!=0; i-=3).
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