Answer: false The ! operator negates a boolean value. !true evaluates to false.

Answer: true Both (a < b) which is (5 < 10) = true and (b 0) which is (10 0) = true. true && true = true.

Which expression is equivalent to !(x < 5)?

Answer: x = 5 The negation of x < 5 is x = 5 (x is at least 5).

AP Computer Science A · Topic 3.5

Compound Boolean Expressions Practice

Q: Which expression is equivalent to !(x < 5)?

Answer: x = 5 The negation of x < 5 is x = 5 (x is at least 5).

Part of Boolean Expressions and if Statements.

Practice questions

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Sample questions

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Sample 1difficulty 1/5
```
boolean b = true;
System.out.println(!b);
```
$What is printed?$
- A
  $false$
  check_circle
- B
  $true$
- C
  $!true$
- D
  $1$
Why
$The ! operator negates a boolean value. !true evaluates to false.$
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Sample 2difficulty 2/5
```
int a = 5;
int b = 10;
boolean result = (a < b) && (b > 0);
System.out.println(result);
```
$What is printed?$
- A
  $true$
  check_circle
- B
  $false$
- C
  $5$
- D
  $10$
Why
$Both (a < b) which is (5 < 10) = true and (b > 0) which is (10 > 0) = true. true && true = true.$
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Sample 3difficulty 2/5
```
if (!(x < 5)) {
    return true;
}
return false;
```
$Which expression is equivalent to !(x < 5)?$
- A
  $x != 5$
- B
  $x <= 5$
- C
  $x > 5$
- D
  $x >= 5$
  check_circle
Why
$The negation of x < 5 is x >= 5 (x is at least 5).$
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Sample 4difficulty 2/5
```
int n = 50;
if (n >= 0 && n <= 100) {
  System.out.println("valid");
} else {
  System.out.println("invalid");
}
```
$What is printed?$
- A
  $valid$
  check_circle
- B
  $0$
- C
  $invalid$
- D
  $100$
Why
$50 is between 0 and 100 inclusive, so both parts of the && are true, and "valid" is printed.$
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Sample 5difficulty 2/5
$<code> (5 > 3) && (4 < 2) </code> evaluates to$
- A
  $1$
- B
  $Compile error$
- C
  $false$
  check_circle
- D
  $true$
Why
$AND requires both true; second is false \to result false.$
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