Parameters with default values in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a function with a default parameter value.

Kotlin

fun greet(name: String = [1]) {
    println("Hello, $name!")
}

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

A"Guest"

BGuest

C"name"

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting to put quotes around string default values.

Using a variable name instead of a value.

In Kotlin, default parameter values must be provided as expressions. Here, "Guest" is a string literal used as the default value.

2fill in blank

medium

Complete the function call to use the default parameter value.

Kotlin

fun greet(name: String = "Guest") {
    println("Hello, $name!")
}

greet([1])

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

A(no argument)

B""

C"John"

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Passing an empty string "" instead of no argument.

Passing null which is not allowed without nullable type.

To use the default parameter value, you can call the function without passing any argument, so the blank should be empty.

3fill in blank

hard

Fix the error in the function definition by adding a default value to the parameter.

Kotlin

fun multiply(a: Int, b: Int = [1]): Int {
    return a * b
}

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

A0

B1

C"1"

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using a string "1" instead of integer 1.

Using null for a non-nullable parameter.

The default value for an Int parameter must be an integer literal. 1 is the multiplicative identity, so it makes sense as a default.

4fill in blank

hard

Fill both blanks to create a function with two parameters, each having default values.

Kotlin

fun formatText(text: String = [1], prefix: String = [2]) {
    println("$prefix$text")
}

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

A"Hello"

B"World"

C"* "

D"- "

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up which default value goes to which parameter.

Forgetting quotes around string defaults.

The first parameter text defaults to "Hello" and the prefix defaults to "* ". Both are string literals.

5fill in blank

hard

Fill all three blanks to define a function with default values and call it with one argument.

Kotlin

fun calculateArea(length: Int = [1], width: Int = [2], unit: String = [3]): String {
    val area = length * width
    return "$area $unit"
}

println(calculateArea(5))

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

A10

B1

C"cm²"

D"m²"

Attempts:

3 left

💡 Hint

Common Mistakes

Using string values for integer parameters.

Omitting quotes around the unit string.

The length defaults to 10, width to 1, and unit to "cm²". Calling calculateArea(5) uses length=5, width=1, unit="cm²".