Primitive data types in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a variable of type int.

Java

int number = [1];

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

Atrue

B"10"

C10.5

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around numbers, which makes them strings.

Assigning decimal numbers to int variables.

The variable number is declared as an int, so it must be assigned an integer value like 10.

2fill in blank

medium

Complete the code to declare a variable of type boolean.

Java

boolean isJavaFun = [1];

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

A"true"

B1

Ctrue

Dyes

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around true or false, making them strings.

Using numbers like 1 or 0 instead of boolean literals.

The boolean type accepts only true or false without quotes.

3fill in blank

hard

Fix the error in the code to correctly declare a double variable.

Java

double price = [1];

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

A15.0

B15,0

C15

D"15.0"

Attempts:

3 left

💡 Hint

Common Mistakes

Using commas instead of dots for decimals.

Putting the number inside quotes, making it a string.

The double type requires a decimal number without quotes and with a dot as decimal separator.

4fill in blank

hard

Fill both blanks to declare a char variable and assign a letter.

Java

char letter = [1][2];

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

A"A"

B'A'

C'B'

D"B"

Attempts:

3 left

💡 Hint

Common Mistakes

Using double quotes instead of single quotes for chars.

Leaving the character unquoted.

The char type holds a single character enclosed in single quotes. The second blank is empty because the character literal is complete.

5fill in blank

hard

Fill all three blanks to declare variables of types int, float, and boolean.

Java

int count = [1];
float temperature = [2]f;
boolean isActive = [3];

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

A100

B36.6

Ctrue

D"true"

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around boolean values.

Omitting the 'f' suffix for float literals.

Assigning decimal numbers to int variables.

The int variable count needs an integer like 100.
The float variable temperature needs a decimal number with an 'f' suffix.
The boolean variable isActive needs the literal true or false without quotes.