Main function as entry point in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the main function in Kotlin.

Kotlin

fun [1]() {
    println("Hello, Kotlin!")
}

Drag options to blanks, or click blank then click option'

Amain

Bstart

Crun

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Using a different function name like 'start' or 'run' instead of 'main'.

The main function in Kotlin must be named main to serve as the program's entry point.

2fill in blank

medium

Complete the code to define the main function with command-line arguments.

Kotlin

fun main([1]: Array<String>) {
    println("Arguments count: ${args.size}")
}

Drag options to blanks, or click blank then click option'

Aarguments

Bargs

Cparams

Dinput

Attempts:

3 left

💡 Hint

Common Mistakes

Using a parameter name not matching the usage inside the function.

The parameter name for command-line arguments is commonly args, but any valid name works. Here, args is used.

3fill in blank

hard

Fix the error in the main function declaration.

Kotlin

fun [1](args: Array<String>) {
    println("Welcome!")
}

Drag options to blanks, or click blank then click option'

AMain

Bstart

Cmain

DmainFunction

Attempts:

3 left

💡 Hint

Common Mistakes

Capitalizing the function name as 'Main' instead of 'main'.

The main function must be named exactly main with a lowercase 'm' to be recognized as the entry point.

4fill in blank

hard

Fill both blanks to create a main function that prints each argument.

Kotlin

fun [1]([2]: Array<String>) {
    for (arg in [2]) {
        println(arg)
    }
}

Drag options to blanks, or click blank then click option'

Amain

Bargs

Cparams

Dinput

Attempts:

3 left

💡 Hint

Common Mistakes

Mismatch between parameter name and loop variable.

Using incorrect function name.

The main function is named main and the parameter for arguments is args, matching the loop variable.

5fill in blank

hard

Fill all three blanks to create a main function that prints the number of arguments and the first argument if present.

Kotlin

fun [1]([2]: Array<String>) {
    println("Number of args: $[3].size")
    if ([3].isNotEmpty()) {
        println([3][0])
    }
}

Drag options to blanks, or click blank then click option'

Amain

Bargs

Dparams

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for the parameter and the variable accessing size.

Incorrect function name.

The main function is named main, the parameter is args, and the size property is accessed on args.