Skip to main content

How to generate a random number within a specific range in Kotlin

How to generate a random number within a specific range in Kotlin.

Here's a detailed step-by-step tutorial on how to generate a random number within a specific range in Kotlin:

Step 1: Import the required libraries​

To generate random numbers in Kotlin, we need to import the java.util.Random class. Add the following line at the beginning of your Kotlin file:

import java.util.Random

Step 2: Create an instance of the Random class​

Next, create an instance of the Random class. This class provides methods to generate random numbers. Add the following line to create a new instance of Random:

val random = Random()

Step 3: Generate a random number within a specific range​

To generate a random number within a specific range, use the nextInt() method of the Random class. This method takes an integer argument representing the upper bound (exclusive) of the random number range.

For example, to generate a random number between 0 and 9 (inclusive), use the following code:

val randomNumber = random.nextInt(10)

Here, nextInt(10) generates a random number between 0 and 9.

Step 4: Adjust the range as per your requirements​

If you want to generate a random number within a different range, you can adjust the arguments passed to the nextInt() method.

For example, to generate a random number between 1 and 100 (inclusive), use the following code:

val randomNumber = random.nextInt(100) + 1

Here, nextInt(100) generates a random number between 0 and 99. By adding 1 to the result, you get a random number between 1 and 100.

Step 5: Use the generated random number​

Once you have the random number, you can use it as per your requirements. You can assign it to a variable, use it in calculations, display it to the user, etc.

Here's an example that generates a random number between 1 and 10 (inclusive) and prints it:

val random = Random()
val randomNumber = random.nextInt(10) + 1
println("Random number: $randomNumber")

This will output a random number between 1 and 10 each time it is run.

That's it! You have successfully generated a random number within a specific range in Kotlin. Feel free to modify the range and use the generated random number in your own Kotlin projects.