ProgramModerate2 marks
Convert the following do...while loop to a for loop: int x = 10; do { x--; System.out.print(x); } while(x >= 1);
Topic: Converting do-while to for
Previous-year question practice database
Answer
Exam answer
int x; for(x = 10; x >= 1; ) { x--; System.out.print(x); }
A neater equivalent:
for(int x = 10; x >= 1; x--) System.out.print(x - 1);
Explanation
Map the three parts across: initialisation - int x = 10 condition - x >= 1 update - x-- , which here sits INSIDE the body because its result is printed The first version above keeps the body exactly as it was and leaves the update slot of the for header empty, which is perfectly legal. One point of care: a do-while always runs at least once, while a for tests first. Here x starts at 10 and the condition is true immediately, so the two behave identically — worth stating in your answer if the question asks you to justify the conversion.
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