Else–if ladder in C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a number is positive.

C

if (num [1] 0) {
    printf("Positive\n");
}

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

A<

B!=

C==

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' will check for negative numbers.

Using '==' checks only if number equals zero.

The condition num > 0 checks if the number is positive.

2fill in blank

medium

Complete the else-if ladder to check if a number is zero.

C

if (num > 0) {
    printf("Positive\n");
} else if (num [1] 0) {
    printf("Zero\n");
}

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

A==

B<

C!=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '=' instead of '==' causes assignment, not comparison.

Using '!=' checks for not equal, which is incorrect here.

The condition num == 0 checks if the number is exactly zero.

3fill in blank

hard

Fix the error in the else-if ladder condition to check if a number is negative.

C

if (num > 0) {
    printf("Positive\n");
} else if (num [1] 0) {
    printf("Negative\n");
}

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

A>

B!=

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' checks for positive numbers, not negative.

Using '==' checks for zero, not negative numbers.

The condition num < 0 correctly checks if the number is negative.

4fill in blank

hard

Fill both blanks to complete the else-if ladder that prints the sign of a number.

C

if (num [1] 0) {
    printf("Positive\n");
} else if (num [2] 0) {
    printf("Negative\n");
} else {
    printf("Zero\n");
}

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

A>

B<

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the operators will give wrong results.

Using '==' in these conditions is incorrect.

The first condition checks if num > 0 (positive), the second if num < 0 (negative), else zero.

5fill in blank

hard

Fill all three blanks to complete the else-if ladder that categorizes a number.

C

if (num [1] 0) {
    printf("Positive\n");
} else if (num [2] 0) {
    printf("Negative\n");
} else if (num [3] 0) {
    printf("Zero\n");
}

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

A>

B<

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of '==' for zero check.

Mixing up the order of conditions.

The conditions check if num > 0 (positive), num < 0 (negative), and num == 0 (zero).