Control flow (if, for, while, switch) in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a number is positive.

Flutter

if (number [1] 0) {
  print('Positive');
}

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

A<

B==

C>

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' causes wrong logic.

Using '==' checks only for zero.

The condition should check if the number is greater than zero to be positive.

2fill in blank

medium

Complete the for loop to print numbers from 0 to 4.

Flutter

for (int i = 0; i [1] 5; i++) {
  print(i);
}

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

A<

B>

C>=

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' prints 0 to 5, which is one extra.

Using '>' causes the loop to never run.

The loop should run while i is less than 5 to print 0 to 4.

3fill in blank

hard

Fix the error in the while loop condition to stop at 3.

Flutter

int count = 0;
while (count [1] 3) {
  print(count);
  count++;
}

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

A<

B<=

C>=

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' excludes 3 from the loop.

Using '>' causes the loop to never run.

The loop should run while count is less than or equal to 3 to include 3.

4fill in blank

hard

Fill both blanks to create a for loop that prints even numbers from 2 to 6.

Flutter

for (int i = [1]; i [2] 6; i += 2) {
  print(i);
}

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

A2

B<

C<=

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' excludes 6 from printing.

Starting at 1 prints odd numbers.

The loop starts at 2 and runs while i is less than or equal to 6 to include 6.

5fill in blank

hard

Fill all three blanks to create a switch statement that prints the day name for 1, 2, or 3.

Flutter

switch(day) {
  case [1]:
    print('Monday');
    break;
  case [2]:
    print('Tuesday');
    break;
  case [3]:
    print('Wednesday');
    break;
  default:
    print('Invalid day');
}

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

A1

B2

C3

D4

Attempts:

3 left

💡 Hint

Common Mistakes

Using 4 causes the default case to run.

Mixing numbers changes the output.

The cases should match the day numbers 1, 2, and 3 for Monday, Tuesday, and Wednesday.