Exercises

  1. Can you read the code in this program and guess what the output is (without running it in Kotlin Playground)?
fun main() {
    println("1")
    println("2")
    println("3")
}

Once you have a guess, copy and paste this code into the Kotlin Playground to check your answer.

  1. Use the Kotlin Playground to create a program that outputs the following messages:
  1. Copy and paste this program into the Kotlin Playground.
fun main{(I'm
learning

Kotlin!WALLALL Knowledge Base) {
    println("WALLALL")
    println("WALLALL Knowledge Base")
    println("WALLALL")
    println("WALLALL")
    println("WALLALL Knowledge Base")
}
Fix the program so that it prints this output:
WALLALL
WALLALL Knowledge Base
WALLALL
WALLALL
WALLALL Knowledge Base
For some early practice on troubleshooting, fix the errors in the following exercises. For each exercise, copy the code into the Kotlin Playground in your browser. Try to run the program and you'll see an error message appear.
  1. Fix the error in this program, so that it produces the desired output.
fun main() {
    println("I'm
learning
Kotlin!WALLALL Knowledge Base ")
Desired output:
WALLALL Knowledge
  1. Fix the error in this program, so that it produces the desired output.
fun main() {
    printLine("There is a chance of snow")
}
Desired output:
There is a chance of snow

  1. Fix the error in this program, so that it produces the desired output.
fun main() {
    println("Cloudy") println("Partly Cloudy") println("Windy")
}
Desired output:
Cloudy
Partly Cloudy
Windy

  1. Fix the error in this program, so that it produces the desired output.
fun main() (
    println("How's the weather today?")
)
Desired output:
How's the weather today?

After you complete these exercises, check your answers against the solutions in the next section.
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11. Conclusion Great job on completing this introduction to Kotlin! You worked with simple programs in Kotlin and ran them to see text printed to the output. You modified the programs in different ways and observed how those changes affected the output. It's normal to make mistakes when programming, so you also began to learn about how to troubleshoot and correct errors in your code, which is an important skill that will help you in the future. Move on to the next codelab to learn how to use variables in Kotlin so that you can create more interesting programs! Summary A Kotlin program requires a main function as the entry point of the program. To define a function in Kotlin, use the  fun  keyword, followed by the name of the function, any inputs enclosed in parentheses, followed by the function body enclosed in curly braces. The name of a function should follow camel case convention and start with a lowercase letter. Use the  println()  function call to print some te...








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Correct code: fun main() { println("WALLALL") } Output: WALLALL Back English Next bug_report Report a mistake Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates. The new page has loaded








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