Else–if ladder in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a number is positive.

Java

int num = 10;
if (num [1] 0) {
    System.out.println("Positive number");
}

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

A==

B>

C<

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' will check for negative numbers.

Using '==' checks only if the number is 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.

Java

int num = 0;
if (num > 0) {
    System.out.println("Positive number");
} else if (num [1] 0) {
    System.out.println("Zero");
} else {
    System.out.println("Negative number");
}

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

A==

B<

C>=

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' or '>=' will not correctly check for zero.

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.

Java

int num = -5;
if (num > 0) {
    System.out.println("Positive number");
} else if (num [1] 0) {
    System.out.println("Negative number");
} else {
    System.out.println("Zero");
}

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 equality, not negativity.

The condition num < 0 checks if the number is negative. The else block handles zero.

4fill in blank

hard

Fill both blanks to complete the else-if ladder that prints the size category based on age.

Java

int age = 20;
if (age [1] 12) {
    System.out.println("Child");
} else if (age [2] 19) {
    System.out.println("Teenager");
} else {
    System.out.println("Adult");
}

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

A<=

B>=

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of range checks.

Mixing up '<' and '>=' operators.

The first condition checks if age is 12 or less (child). The second checks if age is less than 19 (teenager). Otherwise, adult.

5fill in blank

hard

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

Java

int temp = 30;
if (temp [1] 0) {
    System.out.println("Freezing");
} else if (temp [2] 30) {
    System.out.println("Cold");
} else if (temp [3] 60) {
    System.out.println("Warm");
} else {
    System.out.println("Hot");
}

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

A<=

B<

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' instead of '<=' for freezing condition.

Confusing '>=' and '<' in conditions.

The first condition checks if temp is 0 or below (freezing). The second checks if temp is less than 30 (cold). The third checks if temp is greater than 60 (warm). The else covers hot temperatures from 30 to 60.