Logical operators - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if both a and b are true using the logical AND operator.

C

if (a [1] b) {
    printf("Both are true\n");
}

Drag options to blanks, or click blank then click option'

A||

B|

C&&

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using | instead of && which is a bitwise OR, not logical AND.

Using || which checks if either condition is true, not both.

The logical AND operator in C is &&. It returns true only if both operands are true.

2fill in blank

medium

Complete the code to check if either x or y is true using the logical OR operator.

C

if (x [1] y) {
    printf("At least one is true\n");
}

Drag options to blanks, or click blank then click option'

A||

B|

C&

D&&

Attempts:

3 left

💡 Hint

Common Mistakes

Using & instead of || which is a bitwise AND, not logical OR.

Using && which requires both conditions to be true.

The logical OR operator in C is ||. It returns true if at least one operand is true.

3fill in blank

hard

Fix the error in the condition to check if not flag is true.

C

if ([1]flag) {
    printf("Flag is false\n");
}

Drag options to blanks, or click blank then click option'

A!

Bnot

Cflag

D~

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'not' which is not valid C syntax.

Using ~ which is bitwise NOT, not logical NOT.

The logical NOT operator in C is !. It negates the boolean value of flag.

4fill in blank

hard

Fill both blanks to check if a is true and b is false.

C

if (a [1] [2]b) {
    printf("a is true and b is false\n");
}

Drag options to blanks, or click blank then click option'

A&&

B||

C!

D~

Attempts:

3 left

💡 Hint

Common Mistakes

Using || instead of && which would check if either condition is true.

Using ~ instead of ! which is bitwise NOT.

Use && to check both conditions and ! to negate b.

5fill in blank

hard

Fill all three blanks to check if x is true, y is false, and z is true.

C

if (x [1] [2]y [3] z) {
    printf("x true, y false, z true\n");
}

Drag options to blanks, or click blank then click option'

A&&

B||

C!

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using | or & which are bitwise operators, not logical.

Using || which would allow any condition to be true.

Use && to combine conditions, ! to negate y, and && again to combine with z.