Data types (int, double, String, bool) in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an integer variable named count with value 10.

Flutter

int count = [1];

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

A"10"

B10.0

C10

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the number, which makes it a String.

Using a decimal number like 10.0 which is a double.

The variable count is declared as an integer, so the value must be a whole number without quotes.

2fill in blank

medium

Complete the code to declare a double variable named price with value 9.99.

Flutter

double price = [1];

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

A9.99

Btrue

C"9.99"

D9

Attempts:

3 left

💡 Hint

Common Mistakes

Using an integer value like 9 instead of 9.99.

Putting the number inside quotes, making it a String.

The variable price is a double, so the value must be a number with a decimal point without quotes.

3fill in blank

hard

Fix the error in the code by completing the declaration of a String variable named greeting with value Hello.

Flutter

String greeting = [1];

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

Atrue

B"Hello"

CHello

D9

Attempts:

3 left

💡 Hint

Common Mistakes

Not using quotes around the text.

Using single quotes inconsistently (though Dart allows single quotes, this example expects double quotes).

Strings must be enclosed in double quotes in Dart to be valid text values.

4fill in blank

hard

Fill both blanks to declare a boolean variable named isActive set to true.

Flutter

bool isActive = [1];

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

A"true"

B"false"

Cfalse

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around true or false, which makes them Strings.

Using the wrong boolean value.

Boolean variables hold true or false without quotes.

5fill in blank

hard

Fill all three blanks to declare variables: an int age 25, a double height 1.75, and a String name "Alice".

Flutter

int age = [1];
double height = [2];
String name = [3];

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

A25

B1.75

C"Alice"

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Putting numbers inside quotes.

Using wrong types for the values.

Each variable must have the correct type and value format: int without quotes, double with decimal without quotes, and String with quotes.