Given the following main method: public static void main(String[] args) { int num = 5; do { System.out.print(num-- + " "); } while (num == 0); } What is the result?

The correct answer is D. 5. D is correct because a do-while loop always executes its body once before checking the condition. The body prints num--, which outputs 5 (post-decrement: print first, then decrement), leaving num at 4. The condition num == 0 evaluates 4 == 0, which is false, so the loop exits…

Using Loop Constructs

Question

Given the following main method:
public static void main(String[] args) {
int num = 5;
do {
System.out.print(num-- + " ");
} while (num == 0);
}
What is the result?

Options

A5 4 3 2 1 0
B5 4 3 2 1
C4 2 1
D5
ENothing is printed

How the community answered

(29 responses)

A
3% (1)
C
7% (2)
D
90% (26)

Explanation

D is correct because a do-while loop always executes its body once before checking the condition. The body prints num--, which outputs 5 (post-decrement: print first, then decrement), leaving num at 4. The condition num == 0 evaluates 4 == 0, which is false, so the loop exits immediately - printing only 5.

A and B would require the condition to be num >= 0 or num > 0 respectively, allowing the loop to continue while num stays positive. C doesn't correspond to any plausible loop behavior here. E would be correct if this were a regular while loop (where the condition is checked first), but do-while guarantees at least one execution regardless of the condition.

Memory tip: Think of do-while as "do it first, ask questions later" - the condition only matters after the first run, so the body always fires at least once.

Topics

#do-while loops#post-decrement operator#loop condition evaluation#control flow

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