Kotlin Function: Print numbers from 1 to n, Return Unit

Last update on February 04 2025 08:16:35 (UTC/GMT +8 hours)

Write a Kotlin function that takes an integer n as an argument and prints the numbers from 1 to n on separate lines. The function should return Unit.

Pre-Knowledge (Before you start!)

• Basic Kotlin Syntax: Familiarity with writing and running Kotlin programs.
• Kotlin Functions: Understanding how to define and call functions in Kotlin.
• Unit Type: Awareness that functions without a return value implicitly return Unit in Kotlin.
• Loops in Kotlin: Knowledge of using for loops to iterate over a range of numbers.
• Range Operator: Understanding the range operator (..) to define a sequence of numbers.
• Printing Output: Familiarity with the println() function to display output on the screen.

Hints (Try before looking at the solution!)

• Define the Function.
• Use a For Loop.
• Print Each Number.
• Call the Function.
• Test with Different Values.
• Common Errors to Avoid:
  • Forgetting the range operator.
  • Misplacing loop boundaries.
  • Unnecessarily adding a return statement.

Sample Solution:

Kotlin Code:

fun printNumbers(n: Int): Unit {
    for (i in 1..n) {
        println(i)
    }
}

fun main() {
    val number = 7
    printNumbers(number)
}

Sample Output:

1
2
3
4
5
6
7

Explanation:

The "printNumbers()" function receives an n parameter of type Int. It uses a for loop to iterate from 1 to n and prints each number on a separate line using the println function. The return type Unit indicates that the function doesn't explicitly return a value.

In the "main()" function, a sample number (number) is provided, and printNumbers is called with this number as an argument. The function then prints the numbers from 1 to number on separate lines.

Kotlin Editor:

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