Question

How to convert an array of multi‑digit numbers to a number in Kotlin

Answer 1

// ------------------------------------------------------------
// ArrayToNumber
// Converts an int[] into a single integer by concatenating
// each element as a string. Works for multi-digit numbers.
// Example: {14, 6, 9, 31, 20} ->14693120
// ------------------------------------------------------------
fun arrayToNumber(arr: List<Int>): Int {
    val s = arr.joinToString(separator = "") { it.toString() }   // concatenate as text
    
    return s.toInt()                                             // convert final string to int
}

fun main() {
    val arr = listOf(14, 6, 9, 31, 20)

    val n = arrayToNumber(arr)

    println("n = $n")
}



/*
run:

n = 14693120

*/

 

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