Nested for loop in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print numbers from 1 to 3 using a for loop.

Java

for (int i = 1; i [1] 4; 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 > or >= will not run the loop as expected.

Using <= 3 is correct but not the option here.

The loop runs while i is less than 4, so it prints 1, 2, and 3.

2fill in blank

medium

Complete the code to print a 3x3 grid of stars using nested for loops.

Java

for (int i = 1; i <= 3; i++) {
    for (int j = 1; j [1] 4; j++) {
        System.out.print("*");
    }
    System.out.println();
}

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

A<

B<=

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= 3 would also work but is not the correct answer here.

Using > or >= will cause the loop not to run properly.

The inner loop runs while j is less than 4, printing 3 stars each row.

3fill in blank

hard

Fix the error in the nested loop to print numbers 1 to 3 in each row.

Java

for (int i = 1; i <= 3; i++) {
    for (int j = 1; j [1] 3; j++) {
        System.out.print(j + " ");
    }
    System.out.println();
}

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

A<=

B<

C>=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using < 3 will stop before printing 3.

Using > or >= will cause the loop not to run correctly.

The inner loop should run while j is less than or equal to 3 to print numbers 1, 2, and 3.

4fill in blank

hard

Fill both blanks to create a nested loop that prints a 4x4 grid of numbers.

Java

for (int i = 1; i [1] 5; i++) {
    for (int j = 1; j [2] 5; j++) {
        System.out.print(j + " ");
    }
    System.out.println();
}

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

A<

B<=

C>

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= 5 would run 5 times, printing numbers up to 5.

Using > or >= will cause the loops not to run correctly.

Both loops run while the variable is less than 5, printing numbers 1 to 4 in each row and column.

5fill in blank

hard

Fill all three blanks to create a nested loop that prints a triangle of stars.

Java

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

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

A<=

B<

C++

D--

Attempts:

3 left

💡 Hint

Common Mistakes

Using < instead of <= will print one less star per row.

Using -- will cause an infinite loop.

The outer loop runs from 1 to 5 inclusive. The inner loop runs from 1 up to i inclusive, printing stars. The j variable increments by 1 each time.