📌 Ranges in Kotlin

In Kotlin, a Range represents a sequence of values defined between a start and an end value. Ranges are commonly used for looping or checking if a value falls within a specific range.

✅ Creating Ranges in Kotlin

You can create ranges using the .. operator, until, or downTo.

📌 1. Using .. Operator (Inclusive)

• The .. operator includes both start and end values.

kotlin
 range = 1..5println(range.toList()) // Output: [1, 2, 3, 4, 5]

📌 2. Using until Operator (Exclusive)

• Excludes the end value.

kotlin
val range = 1 until 5println(range.toList()) // Output: [1, 2, 3, 4]

• until is useful when you don’t want to include the last number.

📌 3. Using downTo Operator

• Creates a range in descending order.

kotlin
val range = 5 downTo 1println(range.toList()) // Output: [5, 4, 3, 2, 1]

📌 4. Using step with Ranges

• You can specify steps to skip values.

kotlin
val range = 1..10 step 2println(range.toList()) // Output: [1, 3, 5, 7, 9]

• step is useful when you need to iterate by a certain increment.

✅ Using Ranges in Control Structures

📌 1. Using in to Check Membership

You can check if a number exists within a range using in or !in.

kotlin
val number = 8if (number in1..10) {    println("$number is within the range.")}  {    println("$number is out of the range.")}

Output:

pgsql
8iswithin the range.

📌 2. Using Ranges in For Loops

kotlin
for (i in1..5) {    println(i)}

Output:

12345

• Descending with Step:

kotlin
for (i in10 downTo 1 step 2) {    println(i)}

Output:

108642

✅ Character and String Ranges

Kotlin supports character ranges using ...

kotlin
val charRange = 'a'..'e'println(charRange.toList()) // Output: [a, b, c, d, e]

You can also check if a character exists within a range:

kotlin
val letter = 'c'println(letter in'a'..'z') // Output: true

✅ Conclusion

• Use .. for inclusive ranges.

• Use until for exclusive ranges.

• Use downTo for reverse ranges.

• Use step to customize increments.

• Use in and !in for membership checks.

• Ranges work with numbers, characters, and loops.