For loop syntax in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 5 using a for loop.

Java

for (int i = 1; i [1] 5; i++) {
    System.out.println(i);
}

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

A<=

B<

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'i < 5' will stop the loop before printing 5.

Using 'i > 5' or 'i >= 5' will not run the loop as expected.

The for loop should run while i is less than or equal to 5 to print numbers 1 through 5.

2fill in blank

medium

Complete the code to sum numbers from 1 to 10 using a for loop.

Java

int sum = 0;
for (int num = 1; num [1] 10; num++) {
    sum += num;
}
System.out.println(sum);

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

A<=

B>=

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'num < 10' will exclude 10 from the sum.

Using 'num > 10' will not run the loop.

The loop must include 10, so the condition should be 'num <= 10'.

3fill in blank

hard

Fix the error in the for loop that counts down from 5 to 1.

Java

for (int i = 5; i [1] 1; i--) {
    System.out.println(i);
}

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

A>

B<=

C<

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' will stop the loop before printing 1.

Using '<' or '<=' will not run the loop correctly when counting down.

When counting down, the loop should continue while i is greater than or equal to 1 to print numbers from 5 down to 1.

4fill in blank

hard

Fill both blanks to create a for loop that prints even numbers from 2 to 10.

Java

for (int i = [1]; i [2] 10; i += 2) {
    System.out.println(i);
}

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

A2

B<

C<=

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Starting at 1 will print odd numbers.

Using '<' will exclude 10 from being printed.

The loop starts at 2 and runs while i is less than or equal to 10 to print even numbers up to 10.

5fill in blank

hard

Fill all three blanks to create a for loop that prints the squares of numbers from 1 to 5.

Java

for (int [1] = 1; [2] [3] 5; [1]++) {
    System.out.println([1] * [1]);
}

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

Ai

C<=

Dj

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in initialization and condition causes errors.

Using '<' excludes the last number 5.

The variable i is used for counting from 1 to 5 inclusive, printing squares.