Factorial in Kotlin

Published on 06 October 2019 (Updated: 06 October 2019)

Welcome to the Factorial in Kotlin page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

import java.math.BigInteger

fun main(args: Array<String>) {
    if (args.isNullOrEmpty() || args[0].toIntOrNull()?.takeIf { it >= 0 } == null) {
        println("Usage: please input a non-negative integer")

    val num = args[0].toInt()
    var factorial = BigInteger.ONE
    for (i in 1..num) {
        // factorial = factorial * i;
        factorial = factorial.multiply(BigInteger.valueOf(i.toLong()))

Factorial in Kotlin was written by:

If you see anything you'd like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of Oct 09 2020 23:34:00. The solution was first committed on Oct 06 2019 08:53:26. As a result, documentation below may be outdated.

How to Implement the Solution

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How to Run the Solution

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