AP Computer Science A · Topic 1.4

Compound Assignment Operators Practice

Part of Primitive Types.

Practice questions

5

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Sample questions

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Sample 1difficulty 2/5
```
x = x + 5;
```
$Which statement is equivalent?$
- A
  $x++ 5;$
- B
  $++x = 5;$
- C
  $x += 5;$
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- D
  $x =+ 5;$
Why
$The compound assignment x += 5 is shorthand for x = x + 5.$
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Sample 2difficulty 2/5
```
int n = 20;
n /= 6;
System.out.println(n);
```
$What is printed?$
- A
  $3$
  check_circle
- B
  $3.33$
- C
  $2$
- D
  $4$
Why
$n /= 6 sets n to n / 6 with integer division, so 20 / 6 = 3.$
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Sample 3difficulty 2/5
```
int x = 10;
x += 3;
x *= 2;
System.out.println(x);
```
$What is printed?$
- A
  $26$
  check_circle
- B
  $20$
- C
  $23$
- D
  $16$
Why
$x += 3 makes x equal to 13, then x *= 2 makes x equal to 26.$
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Sample 4difficulty 2/5
$Given <code> int x = 10; </code>, what is <code> x </code> after <code> x += 5; </code> ?$
- A
  $10$
- B
  $15$
  check_circle
- C
  $5$
- D
  $50$
Why
$<code> x += 5; </code> is equivalent to <code> x = x + 5; </code> .$
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Sample 5difficulty 3/5
```
int n = 23;
n %= 6;
System.out.println(n);
```
$What is printed?$
- A
  $0$
- B
  $3$
- C
  $4$
- D
  $5$
  check_circle
Why
$n %= 6 sets n equal to n % 6; 23 % 6 = 5.$
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