Meet the Kotlin Programming Language

Apr 10 2024 · Kotlin 1.9, Android 14, Android Studio Hedgehog

Lesson 03: Using Operators

Demo

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Open the Starter project in the 03-using-operators directory of the m3-kpl-materials repo in Android Studio Hedgehog or later.

val sum = 3+2
println(sum)

val difference = 10 - 2
println(difference)

val product = 3 * 2
println(product)

val quotient = 6 / 2
println(quotient)

val remainder = 11 % 2
println(remainder)

// 1
var count = 5
// 2
println(count)
// 3
count += 1
println(count)
// 4
count -= 3
println(count)
// 5
count *= 2
println(count)
// 6
count /= 2
println(count)

// 1
count ++
// 2
println(count)
// 3
count--
// 4
println(count)

// 1
val age = 14
// 2
if (age < 16) {
// 3
println("You can't drive")
// 4
} else {
println("You can drive")
}

// 1
val a = 10
val b = 20
val c = 30

// 2
val isALargest = a > b && a > c

// 3
println("It is ${isALargest} that a is the largest number")

// 1
val raining = true
// 2
val temperature = 35

// 3
val carryUmbrella = raining || temperature > 30
// 4
println("Carry an umbrella: $carryUmbrella")

// 1
val isTrue = true
// 2
println(!isTrue)

val hello: String? = null
println(hello?.length)

val message = hello ?: "value is null"
println(message)
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