Comparison Operators

Part of the Fundamentals section of Coddy's Kotlin journey. Lesson 22 of 93.

Comparison operators let you compare two values and get a Boolean result, either true or false. These operators are essential for making decisions in your programs.

Here are Kotlin's comparison operators:

Operator	Meaning	Example	Result
`==`	Equal to	`5 == 5`	`true`
`!=`	Not equal to	`5 != 3`	`true`
`>`	Greater than	`5 > 3`	`true`
`<`	Less than	`5 < 3`	`false`
`>=`	Greater than or equal	`5 >= 5`	`true`
`<=`	Less than or equal	`3 <= 5`	`true`

You can use these with variables and store the results:

fun main() {
    val age = 18
    val isAdult = age >= 18
    println(isAdult)  // Prints: true
    
    val score = 85
    val isPerfect = score == 100
    println(isPerfect)  // Prints: false
}

Comparison operators work with any numeric types and are the foundation for decision-making logic you'll learn in upcoming lessons.

Challenge

Easy

Write a function checkScores that takes score1, score2, and passingScore and returns a string with three comparison results.

Compare the two scores against each other and against the passing threshold using comparison operators.

Logic:

Check if score1 is greater than score2
Check if score1 equals score2
Check if score2 is greater than or equal to passingScore

Parameters:

score1 (Int): The first score
score2 (Int): The second score
passingScore (Int): The minimum passing score

Returns: A string with three boolean results separated by spaces. Format: [result1] [result2] [result3]

Example: For inputs 85, 70, and 60, return "true false true" because 85 > 70 is true, 85 == 70 is false, and 70 >= 60 is true.

Try it yourself

fun checkScores(score1: Int, score2: Int, passingScore: Int): String {
    // Write code here
}

Test yourself

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

All lessons in Fundamentals

1Introduction

The Language Hello World!Comments Recap - Launch Message

4Operators Part 1

Arithmetic Operators Modulo Operator Augmented AssignmentComparison OperatorsRecap - Simple Math

7Basic IO

Println Function String Templates ReadLine Input Type Conversion Recap - Years Until Retirement Recap - True or False

10Functions

Declare A Function Parameters And Arguments Return Values Named Arguments Default Values Single Expression Functions Recap - Sigma Function Recap - Validation Function

13Iterating Over Sequences

Iterating Over Elements WithIndex Method Iterating Over Strings P1 Iterating Over Strings P2 Recap - Indexed Letters

16Final Challenges

Flat Asterisk Pyramid Pattern Finder What To Buy

Practice on your own: Kotlin playground