Answer: 10 20 30 The for-each loop prints each element followed by a space, in order. Note: a trailing space is included after 30.

Answer: 0:x 1:y 2:z Indices start at 0. Note the trailing space after each printout, including after z.

Answer: 26 Sum of all elements: 2+5+8+11 = 26.

AP Computer Science A · Topic 6.2

Traversing Arrays Practice

Part of Array.

Practice questions

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Sample questions

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Sample 1difficulty 1/5
```
int[] a = {10, 20, 30};
for (int x : a) {
  System.out.print(x + " ");
}
```
$What is printed?$
- A
  $10 20 30$
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- B
  $10 20 30$
- C
  $30 20 10$
- D
  $0 1 2$
Why
$The for-each loop prints each element followed by a space, in order. Note: a trailing space is included after 30.$
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Sample 2difficulty 2/5
```
String[] s = {"x", "y", "z"};
for (int i = 0; i < s.length; i++) {
  System.out.print(i + ":" + s[i] + " ");
}
```
$What is printed?$
- A
  $0:x 1:y 2:z$
  check_circle
- B
  $x:0 y:1 z:2$
- C
  $1:x 2:y 3:z$
- D
  $0:x 1:y 2:z$
Why
$Indices start at 0. Note the trailing space after each printout, including after z.$
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Sample 3difficulty 2/5
```
int[] a = {2, 5, 8, 11};
int i = 0;
int sum = 0;
while (i < a.length) {
  sum += a[i];
  i++;
}
System.out.println(sum);
```
$What is printed?$
- A
  $11$
- B
  $26$
  check_circle
- C
  $21$
- D
  $16$
Why
$Sum of all elements: 2+5+8+11 = 26.$
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Sample 4difficulty 3/5
```
int[] a = {10, 20, 30, 40};
for (int i = 0; i <= a.length; i++) {
  System.out.println(a[i]);
}
```
$What happens?$
- A
  $Compilation error$
- B
  $ArrayIndexOutOfBoundsException after printing 10, 20, 30, 40$
  check_circle
- C
  $Prints nothing$
- D
  $Prints 10, 20, 30, 40 with no error$
Why
$The condition i <= a.length is the classic off-by-one bug. After printing all four elements, i=4 and a[4] throws ArrayIndexOutOfBoundsException. The correct condition is i < a.length.$
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Sample 5difficulty 3/5
$To traverse <code> arr </code> from last to first:$
- A
  $for-each$
- B
  $for (int i = arr.length; i > 0; i--)$
- C
  $for (int i = arr.length - 1; i >= 0; i--)$
  check_circle
- D
  $for (int i = 0; i < arr.length; i++)$
Why
$Indices <code> length-1 </code> down to 0.$
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