Answer: 16 n doubles each time: 1, 2, 4, 8, 16. When n becomes 16 the condition n < 16 is false and the loop exits. n is 16.

Answer: done The while condition (10 < 5) is false at the start, so the loop body never executes. Only "done" prints.

What is printed? <codeint i = 0; while (i < 3) { System.out.print(i + " "); i++; } </code</pre

Answer: 0 1 2 Loops while i < 3: prints 0, 1, 2.

AP Computer Science A · Topic 4.1

while Loops Practice

Q: What is printed?

Answer: done The while condition (10 < 5) is false at the start, so the loop body never executes. Only "done" prints.

Q: What is printed? <codeint i = 0; while (i < 3) { System.out.print(i + " "); i++; } </code</pre

Answer: 0 1 2 Loops while i < 3: prints 0, 1, 2.

Part of Iteration.

Practice questions

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Sample questions

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Sample 1difficulty 2/5
```
int n = 1;
while (n < 16) {
  n *= 2;
}
System.out.println(n);
```
$What is printed?$
- A
  $16$
  check_circle
- B
  $8$
- C
  $32$
- D
  $15$
Why
$n doubles each time: 1, 2, 4, 8, 16. When n becomes 16 the condition n < 16 is false and the loop exits. n is 16.$
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Sample 2difficulty 2/5
```
int i = 10;
while (i < 5) {
  System.out.println(i);
  i++;
}
System.out.println("done");
```
$What is printed?$
- A
  $done$
  check_circle
- B
  $10 done$
- C
  $nothing$
- D
  $10 11 12 done$
Why
$The while condition (10 < 5) is false at the start, so the loop body never executes. Only "done" prints.$
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Sample 3difficulty 2/5
$What is printed? <code> int i = 0; while (i < 3) { System.out.print(i + " "); i++; } </code> </pre>$
- A
  $1 2 3$
- B
  $Infinite loop$
- C
  $0 1 2 3$
- D
  $0 1 2$
  check_circle
Why
$Loops while i < 3: prints 0, 1, 2.$
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Sample 4difficulty 3/5
$<code> int i = 1; while (i < 16) i *= 2; </code> — final i and iterations$
- A
  $i=16, 5 iterations$
- B
  $i=32, 5 iterations$
- C
  $i=16, 4 iterations$
  check_circle
- D
  $i=8, 3 iterations$
Why
$1 \to 2 \to 4 \to 8 \to 16 (4 multiplications); condition fails at 16.$
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Sample 5difficulty 3/5
```
int sum = 0;
for (int i = 1; i <= 5; i++) {
  if (i % 2 == 0) {
    continue;
  }
  sum += i;
}
System.out.println(sum);
```
$What is printed?$
- A
  $15$
- B
  $9$
  check_circle
- C
  $6$
- D
  $5$
Why
$continue skips the rest of the iteration when i is even. Only odd values 1, 3, 5 are added: 1+3+5 = 9.$
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