Kotlin if-else Statement Tutorial 🎯

Welcome to our deep dive into the if-else statement in Kotlin! This tutorial is designed to help you understand this fundamental control structure, perfect for beginners and intermediates alike. 📝

What is an if-else Statement? 💡

An if-else statement is a programming construct that lets you test conditions and execute different code blocks based on the result. It's a powerful tool for making decisions in your code.

Basic Syntax 📝

Here's the basic syntax for the if-else statement in Kotlin:

kotlin

if (condition) {
    // Code block executed if condition is true
} else {
    // Code block executed if condition is false
}

Example 1: Simple if-else Statement 🎯

Let's see a simple example where we check if a number is even or odd:

kotlin

fun checkNumber(number: Int) {
    if (number % 2 == 0) {
        println("The number is even.")
    } else {
        println("The number is odd.")
    }
}

checkNumber(5)  // Output: The number is odd.
checkNumber(6)  // Output: The number is even.

Advanced if-else Statements 💡

You can also use multiple if-else statements in a chain to test multiple conditions:

kotlin

fun grade(score: Int) {
    if (score >= 90) {
        println("A")
    } else if (score >= 80) {
        println("B")
    } else if (score >= 70) {
        println("C")
    } else if (score >= 60) {
        println("D")
    } else {
        println("F")
    }
}

grade(85)  // Output: B
grade(70)  // Output: C

Nested if-else Statements 💡

Sometimes, you may need to nest one if-else statement inside another:

kotlin

fun checkAge(age: Int) {
    if (age >= 18) {
        println("You are an adult.")
        if (age >= 65) {
            println("You are a senior citizen.")
        }
    } else {
        println("You are a minor.")
    }
}

checkAge(18)  // Output: You are an adult.
checkAge(66)  // Output: You are an adult. You are a senior citizen.

Kotlin if-else Statement Tutorial 🎯

Kotlin if-else Statement Tutorial 🎯

What is an if-else Statement? 💡

Basic Syntax 📝

Example 1: Simple if-else Statement 🎯

Advanced if-else Statements 💡

Nested if-else Statements 💡

Quiz: If-else Statement Practice 🎯