Numbers

Part of the Fundamentals section of Coddy's Kotlin journey. Lesson 7 of 93.

Use an Int for whole numbers and a Double for fractional numeric values. Kotlin infers these types from the literal:

val seats = 6
val unitPrice = 2.75
println(seats)       // 6
println(unitPrice)   // 2.75

An Int has a limited range. Use Long for larger whole numbers, with an L suffix on the literal:

val distance: Long = 3000000000L
println(distance) // 3000000000

Numeric literals have no quotes. A decimal point gives a fractional numeric type, while quotes would create text. Choose a name that describes the number and use val when you do not need reassignment.

Challenge

Beginner

Write code that initializes a value named myVar with the value 5.

Replace the ? with the correct value
Lines starting with // are comments. They explain what to do but don't affect your code
Only change the line that says val myVar = ?

Try it yourself

fun main() {
    // Type your code below
    val myVar = ?

    // Don't change the line below
    println("myVar = $myVar")
}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

2Variables

Val vs Var Type InferenceNumbersString Boolean Naming Conventions Recap - Initialize Variables

5Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Logical Operators Part 3 Ternary With If Expression Recap - Simple Logic

8Bill Split Calculator

Welcome Message Getting Input

Calculating Tip And Total

Splitting The Bill

Formatted Output

11FizzBuzz with a Twist

Game Overview The FizzBuzz Function

Looping The Numbers

Adding The Twist

14Lists Advanced

List Slicing With SubList List Slicing With Take Drop Sequence Operators The Contains Method Recap - Search a Page

Practice on your own: Kotlin playground